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Lesson 15 Flashcards

1
Q

Cloud Deployment Models

A

Public (multi-tenant)
•Cloud service providers (CSPs)
•Shared between subscribers
•Multi-cloud

Hosted private
•Private instance operated by a CSP but dedicated to a single customer

Private
•Wholly owned and operated by the organization
•On-premises vs. off-premises

Community

Hybrid

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2
Q

On premise vs off-premises

A

(referring to Private)
This type of cloud could be on-premise or offsite relative to the other business
units. An onsite link can obviously deliver better performance and is less likely to
be subject to outages (loss of an Internet link, for instance). On the other hand, a
dedicated offsite facility may provide better shared access for multiple users in
different locations.

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3
Q

Public cloud

A

Public (multi-tenant)
•Cloud service providers (CSPs)
•Shared between subscribers
•Multi-cloud

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4
Q

Multi-cloud architectur

A

Multi-cloud architectures are where an organization

uses services from multiple CSPs.

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5
Q

Hosted private

A

Hosted private
•Private instance operated by a CSP but dedicated to a single customer

Hosted Private—hosted by a third-party for the exclusive use of the organization.
This is more secure and can guarantee a better level of performance but is
correspondingly more expensive.

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6
Q

Private

A
  • Wholly owned and operated by the organization
  • On-premises vs. off-premises

banking or government

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7
Q

Community

A

this is where several organizations share the costs of either a hosted
private or fully private cloud. This is usually done in order to pool resources for a
common concern, like standardization and security policies.

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8
Q

hybrid

A

There will also be cloud computing solutions that implement some sort of hybrid
public/private/community/hosted/onsite/offsite solution. For example, a travel
organization may run a sales website for most of the year using a private cloud
but break out the solution to a public cloud at times when much higher utilization
is forecast.

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9
Q

Cloud Service Models

A

Anything as a service (XaaS)

Infrastructure as a Service (IaaS)
•Unconfigured compute, storage, and network resources
- provisioning IT resources such as
servers, load balancers, and storage area network (SAN) components quickly. Rather
than purchase these components and the Internet links they require, you rent

Software as a Service (SaaS)
•Fully developed applications

Platform as a Service (PaaS)
•Pre-configured OS and database/middleware instances
-A typical PaaS solution would provide servers and storage network infrastructure
(as per IaaS) but also provide a multi-tier web application/database platform on top.

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10
Q

InfInfrastructure as a Service (IaaS)

A

Infrastructure as a Service (IaaS)
•Unconfigured compute, storage, and network resources
- provisioning IT resources such as
servers, load balancers, and storage area network (SAN) components quickly. Rather
than purchase these components and the Internet links they require, you rent

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11
Q

Software as a Service (SaaS)

A

Software as a Service (SaaS)

•Fully developed applications

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12
Q

Platform as a Service (PaaS)

A

•Pre-configured OS and database/middleware instances
-A typical PaaS solution would provide servers and storage network infrastructure
(as per IaaS) but also provide a multi-tier web application/database platform on top.

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13
Q

Security

in the cloud

A

is the things you must take responsibility for

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14
Q

Security of the cloud

A

is the

things the CSP manages.

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15
Q

Cloud responsiblity matix

A

securityh in the cloud and security of the cloud is determined by the type. refer to table in the guide (or slides)

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16
Q

Security as a service

A

Consultants
•Third-party expertise and perspective

Managed Security Services Provider (MSSP)
•Turnkey security solutions (expensice and requires a lot of trust in the MSSP

Security as a Service (SECaaS)
•Cloud-deployed security assessment and analysis
•Cyber threat intelligence and machine learning analytics

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17
Q

Virtualization

A

means that multiple operating systems can be installed and run
simultaneously on a single computer

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18
Q

Virtual Platform

A

requires at least three
components:
• Host hardware—the platform that will host the virtual environment. Optionally,
there may be multiple hosts networked together.
• Hypervisor/Virtual Machine Monitor (VMM)—manages the virtual machine
environment and facilitates interaction with the computer hardware and network.
• Guest operating systems, Virtual Machines (VM), or instances—operating systems
installed under the virtual environment.

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19
Q

Host hardware

A

• Host hardware—the platform that will host the virtual environment. Optionally,
there may be multiple hosts networked together.

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20
Q

• Hypervisor/Virtual Machine Monitor (VMM)

A

• Hypervisor/Virtual Machine Monitor (VMM)—manages the virtual machine
environment and facilitates interaction with the computer hardware and network.

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21
Q

Guest operating systems, Virtual Machines (VM

A

• Guest operating systems, Virtual Machines (VM), or instances—operating systems
installed under the virtual environment.

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22
Q

Type II hypervisors (host-based)

A

In a guest OS (or
host-based) system, the hypervisor application (known as a Type II hypervisor) is itself
installed onto a host operating system.

Examples of host-based hypervisors include
VMware Workstation, Oracle Virtual Box, and Parallels Workstation. The hypervisor
software must support the host OS.

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23
Q

Type I hypervisors (bare metal)

A

A bare metal virtual platform means that the hypervisor (Type I hypervisor) is installed
directly onto the computer and manages access to the host hardware without going
through a host OS. Examples include VMware ESXi Server, Microsoft’s Hyper-V, and
Citrix’s XEN Server. The hardware needs only support the base system requirements
for the hypervisor plus resources for the type and number of guest OSes that will
be installed.
Type

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24
Q

Virtual Desktop Infrastructure and Thin Clients

A
  • Virtual Desktop Infrastructure (VDI)
  • Storing images of clients (OS + applications) on a central server
  • Virtual Desktop Environment (VDE) images are loaded by thin clients
  • Allows for low-power client devices
  • Centralizes control over client desktops
  • Allows for almost completely hosted IT infrastructure
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25
Q

Virtual desktop infrastructure (VDI)

A

refers to using a VM as a means of provisioning
corporate desktops. In a typical VDI, desktop computers are replaced by low-spec,
low-power thin client computers. When the thin client starts, it boots a minimal OS,
allowing the user to log on to a VM stored on the company server infrastructure.
The user makes a connection to the VM using some sort of remote desktop protocol(Microsoft Remote Desktop or Citrix ICA, for instance). The thin client has to find the correct image and use an appropriate authentication mechanism. There may be a 1:1
mapping based on machine name or IP address or the process of finding an image may
be handled by a connection broker.

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26
Q

virtual desktop environment

VDE

A

All application processing and data storage in the virtual desktop environment
(VDE) or workspace is performed by the server.

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27
Q

Application Virtualization

A

Application virtualization is a more limited type of VDI. Rather than run the whole
client desktop as a virtual platform, the client either accesses an application hosted on
a server or streams the application from the server to the client for local processing.

  • Hosting or streaming individual software applications on a server
  • XenApp, App-V, ThinApp
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28
Q

Container virtualization (application cells)

A
  • Resource separation at the OS level
  • Cannot run different OS VMs
  • Docker (uses docker engine instead of hypervisor)
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29
Q

Container vs VMs

A

VM use hypervisor

Container Application cell/container virtualization dispenses with the idea of a hypervisor and
instead enforces resource separation at the operating system level.
- uses docker engine

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30
Q

VM escaping

A

VM escaping refers to malware running on a guest OS jumping to another guest
or to the host. (Can be really bad)

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31
Q

VM escape Protection

A
  • Reduce impact of successful exploits
  • Ensure careful placement of VM services on hosts/within network
  • Respect security zones (DMZ)
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32
Q

•
Guest OS security
•

A

OS environment must still be maintained, patched, etc.

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33
Q

VM sprawl

A

when guest machines are not tracked, not used, etc. Introduces security problems because the systems aren’t maintained or secured.

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34
Q

Virtual machine life cycle management (VMLM)

A

Virtual machine life cycle management (VMLM) software can be deployed to enforce
VM sprawl avoidance. VMLM solutions provide you with a centralized dashboard for
maintaining and monitoring all the virtual environments in your organization

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35
Q

template-based VM creation

A

VMs should conform to an applicationspecific
template with the minimum configuration needed to run that application
(that is, not running unnecessary services).

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36
Q

Obtaining and integrating cloud security data

A

Cloud-based services must be integrated within regular security policies and
procedures and audited for compliance.

Where indicators of on-premises attacks are
found in local application logs and network traffic, indicators of cloud-based attacks are
found in API logs and metrics.

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37
Q

Cloud security Responsibility matrix and SLAs

A
  • Security of the cloud
  • Security in the cloud

As with any contracted service, cloud computing is a means of transferring risk. As such,
it is imperative to identify precisely which risks you are transferring, to identify which
responsibilities the service provider is undertaking, and to identify which responsibilities
remain with you. This should be set out in a service level agreement (SLA) with a
responsibility matrix.

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38
Q

Cloud security reporting

A

Where critical tasks are the responsibility of the service provider, you should try
to ensure that there is a reporting mechanism to show that these tasks are being
completed, that their disaster recovery plans are effective, and so on.

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39
Q

Cloud security legal and compliance responsibilities

A

Another proviso is that your company is likely to still be directly liable for serious
security breaches; if customer data is stolen, for instance, or if your hosted website
is hacked and used to distribute malware. You still have liability for legal and
regulatory requirements. You might be able to sue the service provider for damages,
but your company would still be the point of investigation. You may also need to
consider the legal implications of using a cloud provider if its servers are located in a
different country.

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40
Q

Cloud security insider threat

A

You must also consider the risk of insider threat, where the insiders are administrators
working for the service provider. Without effective security mechanisms such as
separation of duties and M of N control, it is highly likely that they would be able to
gain privileged access to your data. Consequently, the service provider must be able
to demonstrate to your satisfaction that they are prevented from doing so.

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41
Q

Cloud Security Controls uses what types of controls

A

Same types of security controls
•IAM, endpoint protection, resource policies, firewalls, logging, …

Clouds use the same types of security controls as on-premises networks, including
identity and access management (IAM), endpoint protection (for virtual instances),
resource policies to govern access to data and services, firewalls to filter traffic
between hosts, and logging to provide an audit function.

42
Q

Cloud native controls vs. third-party solutions

A

The controls can be deployed and configured using
either the CSP’s web console, or programmatically via a command line interface (CLI) or application programming interface (API)

third-party solution would typically be
installed as a virtual instance within the cloud. For example, you might prefer to run
a third-party next-generation firewall.

43
Q

Application security and IAM

A
  • Secure development/coding
  • Security accounts/groups/roles

Application security in the cloud refers both to the software development process and
to identity and access management (IAM) features designed to ensure authorized use
of applications.

Just as with on-premises solutions, cloud-based IAM enables the creation of user and
user security groups, plus role-based management of privileges.

44
Q

Secrets management

A
  • Block use of root account
  • Use MFA for privileged accounts
  • Protect API keys

A cloud service is highly vulnerable to remote access. A failure of credential
management is likely to be exploited by malicious actors. You must enforce strong
authentication policies to mitigate risks:
• Do not use the root user for the CSP account for any day-to-day logon activity.
• Require strong multifactor authentication (MFA) for interactive logons. Use
conditional authentication to deny or warn of risky account activity.
• Principals—user accounts, security groups, roles, and services—can interact
with cloud services via CLIs and APIs. Such programmatic access is enabled by
assigning a secret key to the account. Only the secret key (not the ordinary account
credential) can be used for programmatic access. When a secret key is generated
for an account, it must immediately be transferred to the host and kept securely on
that host.

45
Q

Cloud Compute

A

Compute
•Processing resources for cloud workloads (CPU and RAM)
•Virtual machines and containers
•Dynamic resource allocation

The compute component provides process and system memory
(RAM) resource as required for a particular workload. The workload could be a virtual
machine instance configured with four CPUs and 16 GB RAM or it could be a container
instance spun up to perform a function and return a result within a given timeframe.

46
Q

dynamic resource allocation.

A

The workload could be a virtual
machine instance configured with four CPUs and 16 GB RAM or it could be a container
instance spun up to perform a function and return a result within a given timeframe.
The virtualization layer ensures that the resources required for this task are made
available on-demand. This can be referred to as dynamic resource allocation.

47
Q

Container security

A

A container uses many shared components on the underlying platform, meaning it
must be carefully configured to reduce the risk of data exposure. In a container engine
such as Docker, each container is isolated from others through separate namespaces
and control groups (docs.docker.com/engine/security/security). Namespaces prevent
one container reading or writing processes in another, while control groups ensure
that one container cannot overwhelm others in a DoS-type attack.

48
Q

API inspection and integration

A 
API inspection and integration
•Number of requests
•Latency
•Error rates
•Unauthorized and suspicious endpoints

The API is the means by which consumers interact with the cloud infrastructure,
platform, or application. The consumer may use direct API calls, or may use a CSPsupplied
web console as a graphical interface for the API. Monitoring API usage
gives warning if the system is becoming overloaded (ensuring availability) and allows
detection of unauthorized usage or attempted usage.
•Number of requests
•Latency
•Error rates
•Unauthorized and suspicious endpoints

49
Q

•Number of requests (api)

A

Number of requests—this basic load metric counts number of requests per
second or requests per minute. Depending on the service type, you might be able
to establish baselines for typical usage and set thresholds for alerting abnormal
usage. An unexplained spike in API calls could be an indicator of a DDoS attack, for
instance.

50
Q

Latency(api)

A

Latency—this is the time in milliseconds (ms) taken for the service to respond to an
API call. This can be measured for specific services or as an aggregate value across
all services. High latency usually means that compute resources are insufficient. The
cause of this could be genuine load or DDoS, however.

51
Q

•Error rates (api)

A

Error rates—this measures the number of errors as a percentage of total calls,
usually classifying error types under category headings. Errors may represent an
overloaded system if the API is unresponsive, or a security issue, if the errors are
authorization/access denied types.

52
Q

•Unauthorized and suspicious endpoints (api)

A

Unauthorized and suspicious endpoints—connections to the API can be managed in
the same sort of way as remote access. The client endpoint initiating the connection
can be restricted using an ACL and the endpoint’s IP address monitored for
geographic location.

53
Q

Instance awareness

A

Instance awareness
•Logging and monitoring to mitigate cloud sprawl

As with on-premises virtualization, it is important to manage instances (virtual
machines and containers) to avoid sprawl, where undocumented instances are
launched and left unmanaged. As well as restricting rights to launch instances, you
should configure logging and monitoring to track usage.

54
Q

cloud storage

A

Where the compute component refers to CPU and system memory resources, the
storage component means the provisioning of peristent storage capacity

55
Q

Performance characteristics for storage tiers

A

Storage profiles will have different performance characteristics
for different applications, such as fast SSD-backed storage for databases versus slower
HDD-backed media for archiving.

56
Q

Input/output operations per second (IOPS)

A

The principal performance metric for cloud storage is the number of
input/output operations per second (IOPS) supported

57
Q

Permissions and resource policies

A

As with on-premises systems, cloud storage resources must be configured to allow
reads and/or writes only from authorized endpoints

**In a resource policy, permissions statements are typically
written as a JavaScript Object Notation (JSON) strings

58
Q

Cloud storage encryption

A

Might want to read this section again….

  • Symmetric media encryption key
  • CSP-managed keys versus customer-managed
  • Separation of duties for CSP-managed keys
59
Q

High availability

A

High availability
•Virtualization layer provisions dynamic allocation and redundancy
•99.99%+ uptime

Can be specified in the SLA

60
Q

Replication

A

Replication
•Copying data between media, servers, or sites
•Performance tiers - hot or cold storaage. hot storage is faster but costs more

Data replication allows businesses to copy data to where it can be utilized most
effectively. The cloud may be used as a central storage area, making data available
among all business units. Data replication requires low latency network connections,
security, and data integrity.

61
Q

High availability across zones

A

High availability across zones
•Local
•Regional
•Geo-redundant storage (GRS)

CSPs divide the world into regions. Each region is independent of the others. The
regions are divided into availability zones. The availability zones have independent data
centers with their own power, cooling, and network connectivity.

62
Q
  • Local
  • Regional
  • Geo-redundant storage (GRS)

(Zones)

A

•Local replication—replicates your data within a single data center in the region
where you created your storage account. The replicas are often in separate fault
domains and upgrade domains.

• Regional replication (also called zone-redundant storage)—replicates your data
across multiple data centers within one or two regions. This safeguards data and
access in the event a single data center is destroyed or goes offline.

• Geo-redundant storage (GRS)—replicates your data to a secondary region that is
distant from the primary region. This safeguards data in the event of a regional
outage or a disaster.

63
Q

Cloud networking types

A

Not sure i understand this
• Networks by which the cloud consumer operates and manages the cloud systems.
• Virtual networks established between VMs and containers within the cloud.
• Virtual networks by which cloud services are published to guests or customers on
the Internet.

64
Q

Virtual Private Clouds (VPCs)

A

Virtual private clouds (VPCs)
•Segmented virtual networks
•Can contain multiple IPv4 and IPv6 subnets

Each customer can create one or more virtual private clouds (VPCs) attached to their
account. By default, a VPC is isolated from other CSP accounts and from other VPCs
operating in the same account. This means that customer A cannot view traffic passing
over customer B’s VPC. The workload for each VPC is isolated from other VPCs.

65
Q

Public and Private Subnets

A

Each subnet within a VPC can either be private or public. To configure a public subnet,
first an Internet gateway (virtual router) must be attached to the VPC configuration.
Secondly, the Internet gateway must be configured as the default route for each
public subnet. If a default route is not configured, the subnet remains private, even
if an Internet gateway is attached to the VPC. Each instance in the subnet must also
be configured with a public IP in its cloud profile. The Internet gateway performs 1:1
network address translation (NAT) to route Internet communications to and from the
instance.

66
Q

ways to provision external connectivity for a subnet if it is not appropriate to make it public

A

• NAT gateway—this feature allows an instance to connect out to the Internet or to
other AWS services, but does not allow connections initiated from the Internet.
• VPN—there are various options for establishing connections to and between VPCs
using virtual private networks (VPNs) at the software layer or using CSP-managed
features.

67
Q

Routing between subnets (in VPC)

A

Routing between subnets
•Can use traditional access control lists
•Can use vendor security appliance instances

Routing can be configured between subnets within a VPC. This traffic can be subject
to cloud native ACLs allowing or blocking traffic on the basis of host IPs and ports.
Alternatively, traffic could be routed through a virtual firewall instance, or other
security appliance.

68
Q

Multiple VPCs for segmentation

A

Multiple VPCs for segmentation
•Between VPCs in the same account
•Between different accounts
•To on-premises networks

Connectivity can also be configured between VPCs in the same account or with VPCs
belonging to different accounts, and between VPCs and on-premises networks.

**Configuring additional VPCs rather than subnets within a VPC allows for a greater
degree of segmentation between instances. A complex network might split segments
between different VPCs across different cloud accounts for performance or
compliance reasons.

69
Q

peering relationships

A

Peering relationships
•One-to-one connections

Traditionally, VPCs can be interconnected using peering relationships and connected
with on-premises networks using VPN gateways. These one-to-one VPC peering
relationships can quickly become difficult to manage, especially if each VPC must
interconnect in a mesh-like structure.

70
Q

Transit gateways

A

Transit gateways
•Virtual router

A transit gateway is a simpler means of managing
these interconnections. Essentially, a transit gateway is a virtual router that handles
routing between the subnets in each attached VPC and any attached VPN gateways

71
Q

VPC Endpoint

A
  • Publishing a service over cloud internal network
  • Avoids exposing traffic to the Internet

A VPC endpoint is a means of publishing a service so that it is accessible by instances in
other VPCs using only the AWS internal network and private IP addresses (d1.awsstatic.
com/whitepapers/aws-privatelink.pdf). This means that the traffic is never exposed to
the Internet. There are two types of VPC endpoint: **gateway and interface.

72
Q

gateway endpoints

A

Gateway endpoint
•Connect instances to S3 and DynamoDB services
•Added as route

A gateway endpoint is used to connect instances in a VPC to the AWS S3 (storage) and
DynamoDB (database) services. A gateway endpoint is configured as a route to the
service in the VPC’s route table.

73
Q

interface endpoint

A

Interface endpoint
•AWS PrivateLink
•Service VPC or default Amazon service published with a DNS name
•VPC endpoint interface added to each service consumer VPC
•Instances within the consumer VPC access the service via the VPC endpoint interface

An interface endpoint makes use of AWS’s PrivateLink feature to allow private access to
custom services:
• A custom service provider VPC is configured by publishing the service with a DNS
host name. Alternatively, the service provider might be an Amazon default service
that is enabled as a VPC interface endpoint, such as CloudWatch Events/Logs.
• A VPC endpoint interface is configured in each service consumer VPC subnet. The
VPC endpoint interface is configured with a private IP address within the subnet
plus the DNS host name of the service provider.
• Each instance within the VPC subnet is configured to use the endpoint address to
contact the service provider.

74
Q

Cloud Firewall Security

A

As in an on-premises network, a firewall determines whether to accept or deny/discard incoming and outgoing traffic. Firewalls work with multiple accounts, VPCs, subnets within VPCs, and instances within subnets to enforce the segmentation required by
the architectural design.

Need for segmentation
•Load balancing workloads
•Isolating data processing
•Compartmentalizing data access

Open Systems Interconnection (OSI) layers
•Network layer (layer 3)
•Transport layer (layer 4)
•Application layer (layer 7)

Cloud native versus vendor controls
•Deploy host-based firewall within instance
•Deploy vendor firewall/security appliance as instance
•Transaction and volume costs for cloud native solutions

75
Q

Need for segmentation in the cloud

A

Need for segmentation (using firewalls)
•Load balancing workloads
•Isolating data processing
•Compartmentalizing data access

Segmentation may be needed for many different reasons,including separating workloads for performance and load balancing, keeping data
processing within an isolated segment for compliance with laws and regulations,
and compartmentalizing data access and processing for different departments or
functional requirements.

76
Q

Open Systems Interconnection (OSI) layers (firewalls)

A

Open Systems Interconnection (OSI) layers
•Network layer (layer 3)
•Transport layer (layer 4)
•Application layer (layer 7)

Filtering decisions can be made based on packet headers and payload contents at
various layers, identified in terms of the OSI model:
• Network layer (layer 3)—the firewall accepts or denies connections on the basis of
IP addresses or address ranges and TCP/UDP port numbers (the latter are actually contained in layer 4 headers, but this functionality is still always described as basic layer 3 packet filtering).

• Transport layer (layer 4)—the firewall can store connection states and use rules to
allow established or related traffic. Because the firewall must maintain a state table
of existing connections, this requires more processing power (CPU and memory).\

• Application layer (layer 7)—the firewall can parse application protocol headers
and payloads (such as HTTP packets) and make filtering decisions based on their
contents. This requires even greater processing capacity (or load balancing), or the
firewall will become a bottleneck and increase network latency.

77
Q

Cloud native versus vendor controls

A

Cloud native versus vendor controls
•Deploy host-based firewall within instance
•Deploy vendor firewall/security appliance as instance
•Transaction and volume costs for cloud native solutions

Native cloud application-aware firewalls incur transaction costs, typically calculated on
time deployed and traffic volume. These costs might be a reason to choose a thirdparty
solution instead of the native control.

78
Q

Security groups

A

•Basic stateful packet filtering for instances
- In AWS, basic packet filtering rules managing traffic that each instance will accept can
be managed through security groups

•Default security group
allows any outbound traffic and any inbound traffic frominstances also bound to the default security group

  • Custom groups
    • Custom group with no rules drops all network traffic
    • Can be assigned to multiple instances
    • Instances in the same subnet can be assigned different security groups
    • Multiple security groups can be assigned to the same instance
79
Q

Cloud Access Security Brokers (CASB)

A
  • Mediate access to cloud services by enterprise users across all types of devices
  • Implemented as proxy or via API
  • Next-Generation Secure Web Gateway
    • Secure access service edge (SASE)

A cloud access security broker (CASB) is enterprise management software designed
to mediate access to cloud services by users across all types of devices.

CASBs provide you with visibility into how clients and other network nodes are using
cloud services. Some of the functions of a CASB are:
• Enable single sign-on authentication and enforce access controls and authorizations
from the enterprise network to the cloud provider.
• Scan for malware and rogue or non-compliant device access.
• Monitor and audit user and resource activity.
Mitigate data exfiltration by preventing access to unauthorized cloud services from
managed devices.

80
Q

Next-Generation Secure Web Gateway

A
  • Next-Generation Secure Web Gateway
    • Secure access service edge (SASE)

Enterprise networks often make use of secure web gateways (SWG). An on-premises
SWG is a proxy-based firewall, content filter, and intrusion detection/prevention
system that mediates user access to Internet sites and services. A next-generation
SWG, as marketed by Netskope (netskope.com/products/next-gen-swg), combines
the functionality of an SWG with that of data loss prevention (DLP) and a CASB to
provide a wholly cloud-hosted platform for client access to websites and cloud apps.
This supports an architecture defined by Gartner as secure access service edge (SASE)

81
Q

Monolithic client/server applications

A

Virtualization gets us away from monolithic client/server applications

In the early days of computer networks, architecture was focused on the provision of server machines and intermediate network systems (switches and routers).
Architectural choices centered around where to place a “box” to run monolithic network applications such as routing, security, address allocation, name resolution,
file sharing, email, and so on. With virtualization, the provision of these applications
is much less dependent on where you put the box and the OS that the box runs.
Virtualization helps to make the design architecture fit to the business requirement
rather than accommodate the business workflow to the platform requirement

82
Q

SOA

A

Service-oriented architecture (SOA)
•Atomic services with defined input/output interfaces
•Loosely decoupled

Service-oriented architecture (SOA) conceives of atomic services closely mapped
to business workflows. Each service takes defined inputs and produces defined
outputs. The service may itself be composed of sub-services. The key features of
a service function are that it is self-contained, does not rely on the state of other
services, and exposes clear input/output (I/O) interfaces. Because each service has a
simple interface, interoperability is made much easier than with a complex monolithic
application. The implementation of a service does not constrain compatibility choices
for client services, which can use a different platform or development language. This
independence of the service and the client requesting the service is referred to as
loose coupling.

83
Q

Loose coupling

A

(as part of SOA) The implementation of a service does not constrain compatibility choices
for client services, which can use a different platform or development language. This
independence of the service and the client requesting the service is referred to as
loose coupling.

84
Q

Microservices

A

Microservices
•Each service capable of independent development and deployment
•Highly decoupled

The main difference between SOA and microservices is that SOA allows a service to be
built from other services. By contrast, each microservice should be capable of being
developed, tested, and deployed independently. The microservices are said to be highly
decoupled rather than just loosely decoupled.

85
Q

Services integration and orchestration

A
  • Enterprise service bus versus orchestration
  • Automating automation
  • Uses scripts and service APIs to provision a workflow
  • Cloud orchestration platforms
86
Q

Sevice Integration

A

Services integration refers to ways of making these decoupled service or microservice
components work together to perform a workflow.

87
Q

Orchestration

A

Where SOA used the concept of
a enterprise service bus, microservices integration and cloud services/virtualization/
automation integration generally is very often implemented using orchestration
tools. Where automation focuses on making a single, discrete task easily repeatable,
orchestration performs a sequence of automated tasks.

88
Q

how is orchestration run?

A

orchestrated steps would have to run numerous

automated scripts or API service calls.

89
Q

cloud orchestration platforms

A

Cloud orchestration platforms connect to and provide administration, management,
and orchestration for many popular cloud platforms and services. One of the
advantages of using a third-party orchestration platform is protection from vendor
lock in. If you wish to migrate from one cloud provider to another, or wish to move to a
multi-cloud environment, automated workflows can often be adapted for use on new
platforms. Industry leaders in this space include Chef (chef.io), Puppet (puppet.com),
Ansible (ansible.com), and Kubernetes (kubernetes.io).

90
Q

Application Programming Interfaces

A

Whether based SOA or microservices, service integration, automation, and
orchestration all depend on application programming interfaces (APIs). The service API
is the means by which external entities interact with the service, calling it with expected
parameters and receiving the expected output.

91
Q

Two predominant ‘styles for creating web application api’s

A
  • Simple Object Access Protocol (SOAP)
    • XML format messaging
    • Web Services (WS) standards
  • Representational State Transfer (REST)
    • RESTful APIs
    • HTTP operation/verb
    • Noun endpoints accessed as URLs

• Simple Object Access Protocol (SOAP)—uses XML format messaging and has a
number of extensions in the form of Web Services (WS) standards that support
common features, such as authentication, transport security, and asynchronous
messaging. SOAP also has a built-in error handling.
• Representational State Transfer (REST)—where SOAP is a tightly specified protocol,
REST is a looser architectural framework, also referred to as RESTful APIs. Where a
SOAP request must be sent as a correctly formatted XML document, a REST request
can be submitted as an HTTP operation/verb (GET or POST for example). Each
resource or endpoint in the API, expressed as a noun, should be accessed via a
single URL.

92
Q

Infrastructure as code

A
  • All configuration and provisioning is performed by scripting/automation/orchestration
  • Elimination of inconsistency (snowflakes and configuration drift)
  • Idempotence
    • Making the same call with the same parameters will always produce the same result

The use of cloud technologies encourages the use of scripted approaches to
provisioning, rather than manually making configuration changes, or installing patches.
An approach to infrastructure management where automation and orchestration fully
replace manual configuration is referred to as infrastructure as code (IaC).

93
Q

snowflakes and configuration drift

A

•Elimination of inconsistency (snowflakes and configuration drift)

One of the goals of IaC is to eliminate snowflake systems. A snowflake is a
configuration or build that is different from any other. The lack of consistency—or
drift—in the platform environment leads to security issues, such as patches that
have not been installed, and stability issues, such as scripts that fail to run because of
some small configuration difference

94
Q

Idempotence

A

Idempotence means that making the same call with the

same parameters will always produce the same result.

95
Q

Software-Defined Networking (SDN)

A
  • Physical and virtual appliances that can be fully automated
    • Control plane/policy definitions
    • Data plane/network controller
    • Management plane
  • SDN policy > northbound API > network controller > southbound API > firewall appliance
  • Network functions virtualization (NFV)
96
Q

SDN conrol plan, data plane, management plane

A

• Control plane—makes decisions about how traffic should be prioritized and
secured, and where it should be switched.
• Data plane—handles the actual switching and routing of traffic and imposition of
security access controls.
• Management plane—monitors traffic conditions and network status.

97
Q

SDN policy > northbound API > network controller > southbound API > firewall appliance

A

A software-defined networking (SDN) application can be used to define policy
decisions on the control plane. These decisions are then implemented on the
data plane by a network controller application, which interfaces with the network
devices using APIs. The interface between the SDN applications and the SDN
controller is described as the “northbound” API, while that between the controller
and appliances is the “southbound” API. SDN can be used to manage compatible
physical appliances, but also virtual switches, routers, and firewalls. The architecture
supporting rapid deployment of virtual networking using general-purpose VMs
and containers is called network functions virtualization (NFV)

98
Q

Network functions virtualization (NFV)

A

The architecture
supporting rapid deployment of virtual networking using general-purpose VMs
and containers is called network functions virtualization (NFV)

99
Q

Software-Defined Visibility

A
  • Near real-time collection, aggregation, and reporting of data
  • Baseline monitoring and anomaly detection
  • Supports east/west and zero trust
  • Security orchestration and automated response (SOAR)

Where SDN addresses secure network “build” solutions, software-defined visibility
(SDV) supports assessment and incident response functions. Visibility is the near realtime
collection, aggregation, and reporting of data about network traffic flows and the
configuration and status of all the hosts, applications, and user accounts participating
in it.

100
Q

Fog and Edge Computing

A

(I think if you just remember that is it is good for IoT devices, it will be fine)

  • Embedded and IoT devices deployed at the network edge
  • Strong requirements for availability and low latency
  • Fog computing
    • Provision greater processing resource between the edge and data center
    • Prioritize data for analysis and alert conditions
  • Edge computing
    • Defines additional zones and processing nodes
    • Edge device zone
    • Edge gateways
    • Fog nodes
    • Data center

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