Azure Questions & Answers - 3
1. All IaaS VMs and PaaS role instances in a VNet can access the public Internet by default - True or False
True.You can control access by using Network Security Groups (NSGs).
2. What is the difference between External load balancer and Internal load balancer?
You can use an external load balancer to provide high availability for IaaS VMs and PaaS role instances accessed from the public Internet whereas internal load balancer to provide high availability for IaaS VMs and PaaS role instances accessed from other services in your VNet.
3. What is a virtual appliance?
A virtual appliance is just another VM in your VNet that runs a software based appliance function, such as firewall, WAN optimization, or intrusion detection.
4. Is there a limit to the number of subnets in my virtual network?
There is no limit on the number of subnets you use within a VNet. All the subnets must be fully contained in the virtual network address space and should not overlap with one another.
5. How small and how large can VNets and subnets be?
The smallest subnet Azure supports is a /29 and the largest is a /8 (using CIDR subnet definitions).
6. Can I modify the size of my VNet size after I create it?
Yes. You can add, remove, expand or shrink a subnet if there are no VMs or services deployed within it by using PowerShell cmdlets or the NETCFG file. You can also add, remove, expand or shrink any prefixes as long as the subnets that contain VMs or services are not affected by the change.
7. Do VNets support IPv6?
No. You cannot use IPv6 with VNets at this time.
8. Can a VNet span regions?
No. A VNet is limited to a single region.
9. Can I use Web Apps with Virtual Network?
No. An Azure Web App cannot be deployed in a VNet. However, Web Apps can securely connect and access resources in your Azure VNet if you have point-to-site configured for your VNet.
10. What are Azure region pairs?
Azure will not roll out an update on paired regions simultaneously during a planned maintenance of virtual machines with single-instance configurations.
Reference - Azure Documentation, Virtual Network FAQ