Virtual Machines Flashcards
How can you provide redundancy and improve performance when using VMs?
Use Scale Sets
What OSI-Layer do load balancers work on?
Layer 4 (Transport)
What constitutes an Internal Load Balancer?
Has a private IP address. No public IP address
What constitutes a Public Load Balancer?
Has a public IP address
How can you simply create a NAT gateway?
Use a PUBLIC Load Balancer
What is an Application Gateway?
It’s a web traffic load balancer
What ISO-Layer do Application Gateways work on?
Layer 7 (Application)
What is Source IP Affinity Mode?
All requests from same IP goes to the same VM
Why is it not recommended to use Source IP Affinity Mode?
Good for applications that are stateful but not recommended for stateless applications. Not efficient.
What is ExpressRoute?
ExpressRoute extends your on-premises networks into Azure over a PRIVATE connection (SITE-TO-SITE)
What is a VPN Gateway?
It is a SITE-TO-SITE connection over the PUBLIC internet
What is VNET peering?
Connect 2 VNETs together
What is a Fault Domain?
Physical Racks within a data center
By default, how many fault domains are there in a Scale Set?
3
What is an Update Domain?
Is a logical group of underlying hardware that can undergo maintenance or be rebooted at the same time
By default, how many update Domains are there in a scale set?
5
What is an Availability Zone?
Unique physical locations within a region. Each zone is made up of one or more datacenters.
What is an Azure Region?
A set of datacenters deployed within a latency-defined perimeter.
What is a Traffic Manager?
Is a DNS-based traffic load balancer
How many types of routing is there for Traffic Managers?
6
What is Performance Routing for Traffic Managers?
Routes to the closest VM
What is Priority Routing for Traffic Managers?
Routes to the closest if MAIN VM is lost
What is Weighted Routing for Traffic Managers?
Routes based on weights
What is Geographic Routing for Traffic Managers?
Route based on user location
What is Multivalue Routing for Traffic Managers?
Route only using IPv4/IPv6 addresses
What is CloudInit?
Used during Linux OS start-up for custom initialisation
What 2 things belong to an Azure Subnet?
NIC and an NSG
Can a VM be moved from one resource group to another?
No. You have to delete it and then re-create it on the other Resource Group
How many availability zones are there in a region?
3
