Virtual Networks Flashcards
What is Azure Virtual Network? *Vnet
Secure network for computer communication
Connect your resources to the internet, to other resources, and on prem networks
What is Address Space and why does it matter?
Range of IP addresses you can use for your resources
Why would you use address space?
Group resources on to the same subnet to make it easier to managed
More efficient address allocation
You can use Network Security Groups for individual subnets
What is the relationship between a Vnet (virtual network) and a region? What about a Vnet to a subscription? Subcription to a Vnet?
Each Vnet must belong to a single region
Each Vnet to a single subscription. Each subscription can have multiple Vnets.
What is a subnet?
A smaller network, part of your Vnet, that is split with part of the larger Address Space range
Better used for security
What is Vnet peering? What are the benefits of Vnet Peering?
Connecting Virtual Networks in different regions
Low latency, high bandwidth
Link Separate Networks - resources in separate networks can communicate with each other - take advantage of Azure infrastructure - never passes through the public internet
Data transfer
What is VPN Gateway?
VPN Gateway connects on premise to virtual networks and virtual networks to each other
What is Azure Load Balancer?
Allows you to manage where inbound traffic goes
Distributes traffic evenly
What are the 3 types of traffic for Load Balancer?
Internet traffic
Internal virtual network traffic
Port Forwarding - traffic to be sent to specific machines from the pool
What are the four components of a Load Balancer?
Inbound traffic
Front end - access point of the load balancer
Backend Pools - VM instances receiving traffic
Rules & Health Probes - Checks to ensure backend instances can receive data
What is a (or Vnet gateway) Gateway subnet?
VMs that are part of the same subnet communicate outbound through a gateway subnet.
What is a VPN gateway? Why is it important?
Virtual Private Network
Send encrypted traffic between on-prem location over the public internet
Key to hybrid cloud architecture
What are the 3 components of a VPN gateway setup?
Azure Vnet with VPN gateway attached - own public IP address
Tunnel - secure connection with encryption mechanisms
On Prem network with its own complimentary VPN
What is a site to site connection vs. multi site connection?
Azure VPN Gateway - Tunnel - single On Prem VPN
Azure VPN Gateway - Tunnel - multiple On Prem VPNs
What is Azure Express Route? What does it need for connection?
Private connection between Azure datacenters and your on prem infrastructure
Highly available
Periodically migrated
On azure backbone
Low latency
Needs - connectivity provider
What is caching? What does caching help with for applications?
Collection of copies of temporary files
Helps with speed of an application
When copies expire, new copy is needed
What are the benefits of a CDN?
Better performance and experience for users
Scaling - protects your backend through copies of app
Distribution - distributes traffic
What is a Content Delivery Network?
Places copies of the data in edge nodes closest to your users - get the data from close by
Distributes content across the globe to reduce latency
Redirection
URL routing
What is Azure Application Gateway and when do you use it?
Extension of Load Balancer - allows you to route traffic with more than just ip address and ports
Distributees traffic for HTTP (web) traffic - URI path and host header
Web app firewall
Can send specific URL traffic to a specific machine
What are the benefits of Application gateway? What is the primary use case?
Scaling - auto scaling
Encryption
Zone redundancy - multiple availability zones, improve fault tolerance
Use case - host multiple websites
