Networking

Question 1

Virtual Network (VNet)

Go through exam tips and the class

Answer 1

Vnet enables many types of azure resources, such as Azure virtual machines to securely communicate with each other over the internet and on-permises networks

Address space: A range of Ip addresses that are available.

subnets: Subnets enable you to segment the Vnet into one or more subnetworks and allocate each portion of virtual network address space to a subnet

Benefits:
Resource grouping
Address allocation
Subnet security

Subnet regions and Subscription:
Regions:
A Vnet belongs to a single region . Every resource in the Vnet must be in the same region too.

Subscriptions: Each VNet belong to single subscription, but each subscription can have multiple VNet’s

Advantages:
scaling: Adding more VNet’s or more address to one is simple
High Availability: Peering VNets using a load balancer or VPN gateway all increase availability
Isolation: Manage and organize resources with subnets and network security groups

VNet peering:

Connectivity between 2 VNets using Microsoft backbone network and never passes trough the public internet

Peering Benfits:
Low Latency, High bandwidth
Link Separate networks
Data transfer

Question 2

Load Balancer

Answer 2

Load Balancer distributes new inbound flows that arrives on the load balancer’s frontend to backend pool instances, according to rules and health probes.

Inbound flows: Traffic from the internet or local network

Frontend: the access point for the load balancer. All traffic goes here first.
Backend pool: the VM instances receiving the traffic

Rules & Health Probes: Checks to ensure backend instance can receive the data.

Scenarios:

Internet traffic
Internal Networks
Port forwarding
Outbound traffic

Question 3

VPN Gateway

Azure Gateway
Secure Tunnel
on-premises gateway

Exam tips and watch video

Answer 3

Virtual Network Gateway:

VNet gateway has 2 or more VM’s deployed to a specific subnet we created called gateway subnet.

VPN Gateway: It is a specific type of virtual network gateway to send the traffic b/w Azure and on-premises over the public internet.

3 Main Components:

1. Azure Vnet with VPN gateway attached, this will have its own public IP address.
2. A secure connection called tunnel which has a one of a way encryption mechanisms
3. on-premises with a complementary gateway can accept encrypt data

Question 4

Application Gateway

Exam Tips

Answer 4

Application gateway is a web traffic Load balancer that enables you to manage traffic to your web applications

Benefits
Scaling : Scale the application gateway up or down based on the amount of traffic received.

Encryption: Comply with any security policies. Disable or enable traffic encryption to the backend.

Zone redundancy: Span multiple availability zones and improve fault resiliency.

Multi-sire hosting: Use the same application gateway for upto 100 websites.

Question 5

Content Delivery Network (CDN)

Exam Tips

Answer 5

It is a distributed network of servers that can deliver web content close to users

Edge notes: Where data is cached to the nearest location for users

Benefits:

Better Performance: Improve the user experience and the performance of your application

Scaling: scale to suit any spikes in traffic and also protect your main backend server instance from high loads.

Distribution: Edge servers will server requests closest to the user. Less Traffic is then sent to server hosting your application

Question 6

Express Route

Answer 6

If we need
Private
Secure
high Bandwidth
Low latency connectivity from on-prem to Azure express route is the one

Question 7

Networking

Go through final summary

Answer 7

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