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AWS Certified Solution Architect Associate > Hybrid Networking > Flashcards

Hybrid Networking Flashcards

the concepts of BGP and IPSec, and the hybrid networking AWS services such as Direct Connect and Site-to-Site VPN.

1
Q

What standardized exterior gateway protocol is designed to exchange routing and reachability information among autonomous systems on the Internet?

A

Border Gateway Protocol (BGP)

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2
Q

What is the primary purpose of Border Gateway Protocol (BGP)?

A

BGP is a path-vector protocol designed to exchange the best path to a destination between peers, this path is referred to as the AS_PATH (Autonomous System Path)

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3
Q

Which TCP port does Border Gateway Protocol (BGP) use?

A

TCP port 179

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4
Q

Does Border Gateway Protocol (BGP) require manual configuration?

A

Yes, BGP peering must be configured manually, it is not automatic

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5
Q

What path does Border Gateway Protocol (BGP) prefer by default?

A

Shortest path to the destination

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6
Q

Is it possible to artificially make certain paths appear longer, causing other paths to be preferred?

A

Yes, using AS_PATH Prepending:

  • Example 1 appears shorter to BGP:
    DES 10.18.0.0/16 | NEXT HOP 10.17.0.1 | AS_PATH 201, 202, i
  • Example 2 appears longer to BGP:
    DES 10.18.0.0/16 | NEXT HOP 10.18.0.1 | AS_PATH 202, 202, 202, i
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7
Q

Which AWS networking services utilize Border Gateway Protocol (BGP)?

A

AWS Direct Connect and Dynamic Site-to-Site VPN

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8
Q

What term is used to describe routers controlled by a single network entity?

A

Autonomous System (AS), each AS is assigned an Autonomous System Number (ASN) by IANA.

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9
Q

What is the difference between Interior Border Gateway Protocol (iBGP) and Exterior Border Gateway Protocol (eBGP)?

A
  • iBGP: Propagates routes within a single Autonomous System (AS)
  • eBGP: Propagates routes between different Autonomous Systems (ASs)
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10
Q

What AWS service enables a private, physical connection between customer facilities and AWS?

A

AWS Direct Connect

AWS Region ↔ DX Location ↔ Customer Premises

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11
Q

What does ordering AWS Direct Connect involve?

A

Ordering Direct Connect involves requesting a dedicated port at an AWS DX Location, enabling physical connectivity to AWS services

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12
Q

Can AWS Direct Connect be used to access only private resources within a VPC?

A

No, DX can be used to access both private resources within a VPC and public AWS services

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13
Q

Can AWS Direct Connect be used to access the public internet?

A

No, DX cannot be used to access the public internet; it is designed for private connections to AWS services

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14
Q

What are the cost components of AWS Direct Connect?

A
  • Hourly Port Allocation Fee: Charged for reserving the DX port
  • Outbound Data Transfer Charges: Data sent from AWS to your premises (inbound is free)
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15
Q

What types of connections does AWS Direct Connect offer?

A
  • Dedicated Connection: Provided directly by AWS, using an Ethernet port allocated exclusively for a single customer
  • Hosted Connection: Offered by an AWS Direct Connect Partner, utilizing their existing network link to AWS
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16
Q

What network speed options are available for AWS Direct Connect?

A
  • Dedicated Connections: 1 Gbps, 10 Gbps, 100 Gbps, 400 Gbps
  • Hosted Connections: 50 Mbps to 25 Gbps in increments (e.g., 50 Mbps, 100 Mbps, 200 Mbps, 300 Mbps, 400 Mbps, 500 Mbps, 1 Gbps, 2 Gbps, 5 Gbps, 10 Gbps, and 25 Gbps)
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17
Q

What factors should be considered when using AWS Direct Connect?

A
  • Establishes a private network connection to AWS
  • Offers low latency and high-speed connectivity
  • Requires provisioning time (can take weeks or months)
  • Does not include built-in redundancy; resilience must be implemented with multiple connections
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18
Q

What AWS Direct Connect component enables access to AWS public or private services?

A

Virtual Interface (VIF)

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19
Q

Which two types of Virtual Interfaces (VIFs) does AWS Direct Connect provide?

A
  • Public VIF: Provides access to AWS public services (e.g., S3, DynamoDB)
  • Private VIF: Provides access to private AWS services within a VPC
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20
Q

Which AWS Direct Connect Virtual Interface (VIF) is used to access AWS Public services like S3?

A

Public VIF

Path: Customer Router → Customer DX Router → AWS DX Router → AWS Public Space

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21
Q

Which AWS Direct Connect Virtual Interface (VIF) is used to access AWS Private services like an EC2 instance in a VPC?

A

Private VIF

Path: Customer Router → Customer DX Router → AWS DX Router → VGW → VPC

21
Q

What are the components of an AWS Direct Connect (DX) connection, and is it inherently resilient?

A
  • DX Location
  • DX Router
  • Cross Connect
  • Customer DX Router
  • Extension Cables
  • Customer Premises
  • Customer Router

Resilience is not built-in and must be planned separately

22
Q

How is resiliency achieved with AWS Direct Connect (DX)?

A
  • Option 1: Use multiple cross-connects from DX routers to multiple customer DX routers and extend these connections with multiple cables to multiple customer premises routers.
    (DX Location, cables, or premises can still fail)
  • Option 2: Achieve maximum resiliency by combining Option 1 with two geographically separated DX locations and connecting them to two separate customer premises data centers
23
Q

How can the security of AWS Direct Connect (DX) be enhanced?

A
  • Using a VPN over Public VIF ensures performance and security by providing an encrypted and authenticated tunnel with low and consistent latency, using Public VIF and VGW/TGW public endpoints
24
Q

Which AWS service provides a central hub to simplify complex peering relationships by connecting VPCs and on-premises networks?

A

AWS Transit Gateway

25
Q

Does AWS Transit Gateway support transitive connections?

A

Yes, it enables a hub-and-spoke topology for VPCs and on-premises networks

26
Q

What is the primary purpose of AWS Transit Gateway?

A

To serve as a network transit hub, simplifying network complexity by connecting various AWS and on-premises resources through attachments, resulting in a more streamlined network architecture

27
Q

What is the resiliency posture of AWS Transit Gateway?

A

Regionally resilient, highly available, and scalable by default

28
Q

What types of attachments are supported by AWS Transit Gateway?

A
  • VPC attachment
  • Site-to-Site VPN attachment
  • Direct Connect Gateway attachment
29
Q

Can AWS Transit Gateway connect multiple VPCs?

A

Yes, it allows traffic to flow transitively between connected VPCs

30
Q

How is AWS Transit Gateway integrated with AWS Site-to-Site VPN?

A

By connecting to Customer Gateway routers

31
Q

Which Virtual Interface (VIF) type is used to connect AWS Direct Connect with AWS Transit Gateway?

A

Transit VIF

32
Q

Can AWS Transit Gateway connect with other Transit Gateways?

A

Yes, Transit Gateways can be peered across accounts and regions to build a global network, typically using a mesh topology

33
Q

Is it possible to share AWS Transit Gateway across AWS accounts?

A

Yes, by using AWS Resource Access Manager (RAM)

34
Q

What secure protocol suite provides encrypted communication between two computers over an IP network?

A

Internet Protocol Security (IPSec), a collection of protocols that establishes secure tunnels over insecure networks

35
Q

What is the primary purpose of Internet Protocol Security (IPSec)?

A

To securely connect two networks (specifically their routers, or peers) over the public internet

36
Q

What are the two main phases of Internet Protocol Security (IPSec)?

A
  • Internet Key Exchange (IKE) Phase 1: Establishes a secure channel; it’s slow and resource-intensive
  • Internet Key Exchange (IKE) Phase 2: Manages quick and efficient data exchange
37
Q

Which Internet Protocol Security (IPSec) phase handles authentication (e.g., passwords or certificates)?

A

Internet Key Exchange (IKE) Phase 1

38
Q

Which Internet Protocol Security (IPSec) phase uses asymmetric encryption to establish a shared symmetric key?

A

Internet Key Exchange (IKE) Phase 1

39
Q

In which Internet Protocol Security (IPSec) phase is the IKE Security Association (SA) (Phase 1 tunnel) created?

A

Internet Key Exchange (IKE) Phase 1

40
Q

Which Internet Protocol Security (IPSec) phase builds on Phase 1 and utilizes the keys established in that phase?

A

Internet Key Exchange (IKE) Phase 2

41
Q

During which Internet Protocol Security (IPSec) phase are encryption methods and keys for bulk data transfer agreed upon?

A

Internet Key Exchange (IKE) Phase 2

42
Q

Which Internet Protocol Security (IPSec) phase establishes the IPSec Security Association (SA) (Phase 2 tunnel) over the Phase 1 tunnel?

A

Internet Key Exchange (IKE) Phase 2

43
Q

Why are Internet Protocol Security (IPSec) operations divided into two separate phases?

A

The separation allows the Phase 1 tunnel (slow and resource-intensive) to remain active while the Phase 2 tunnel (used for data transfer) can be created and torn down as needed, optimizing performance

44
Q

What are the steps involved in Internet Key Exchange (IKE) Phase 1?

A
  1. Authentication using a certificate or pre-shared key
  2. Each peer generates a Diffie-Hellman (DH) private key and derives its public key
  3. Public keys are exchanged securely over the internet
  4. Both peers use their private key and the other’s public key to generate the same shared Diffie-Hellman key
  5. Agreement on encryption and key exchange parameters using the DH key
  6. Symmetric keys are created using the shared DH key and the agreed material
45
Q

What are the steps involved in Internet Key Exchange (IKE) Phase 2?

A
  1. A symmetric key encrypts and decrypts agreements while exchanging additional key material
  2. Both peers communicate and agree on the best encryption and integrity methods
  3. The Diffie-Hellman (DH) key and exchanged material are used to generate a symmetric IPSec key
  4. The IPSec key is used for bulk encryption and decryption of interesting traffic
  5. Two security associations (SAs) are established: one for traffic from Peer A to Peer B and another for traffic from Peer B to Peer A
46
Q

What are the two main types of VPNs?

A
  • Policy-based VPN
  • Route-based VPN
47
Q

Which type of VPN uses traffic-matching rules to send traffic over specific Security Associations (SAs)?

A

Policy-based VPN

48
Q

Which type of VPN allows different rules for various traffic types, offering greater flexibility but being more complex to configure?

A

Policy-based VPN

49
Q

Which type of VPN matches traffic based on prefixes and uses a single pair of Security Associations (SAs) for each prefix?

A

Route-based VPN

50
Q
A

AWS Certified Solution Architect Associate (35 decks)

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