Virtual Networks

Question 1

A vNet contains at least how many subnets?

Answer 1

One

Question 2

What is the maximum length for a vNet name?

Answer 2

80 characters

Question 3

Network Security Groups can be assigned to what?

Answer 3

subnets and network interfaces

Question 4

What, if anything, do you need to do to allow two subnets in the same vNet to talk to each other?

Answer 4

Nothing - they can see each other by default

Question 5

You should use your own DNS implementation under what circumstances?

Answer 5

When using VMs on different vNets (including on-prem and Azure vNet), or when implementing reverse lookup or internal IP addresses

Question 6

What is special about the first and last three IP addresses in any given subnet?

Answer 6

They are not available for use

Question 7

What are the two types of load balancers in Azure?

Answer 7

Public and Internal

Question 8

True or False: It is possible for multiple subscriptions to use the same Azure Virtual Network

Answer 8

False

Question 9

To connect to an Azure virtual network from an on-premises network, what can you use?

Answer 9

VPN (point-to-site or site-to-site), Express Route

Question 10

You can have up to ___ vnets per subscription, per region and can increase this up to ___ by contacting support

Answer 10

50, 500

Question 11

What type of server is a good candidate for a static IP address?

Answer 11

DNS Server, because clients may have trouble locating it if the IP address changed.

Question 12

What can a public IP address be assigned to?

Answer 12

VM, Load Balancer, VPN Gateway, Application Gateway

Question 13

On a VM, the IP address (public or private) is assigned to what component?

Answer 13

NIC

Question 14

True or False: An Application Gateway can have a static public IP address

Answer 14

False (only a private IP address can be static on an App Gateway)

Question 15

Name the two types of infrastructure that can have a public static IP address

Answer 15

VM, Load Balancer

Question 16

What are the two types of IP addresses you can provision (not public and private)?

Answer 16

Basic and Standard

Question 17

Which type of IP address is zone-redundant by default?

Answer 17

Standard

Question 18

Name the two allocation methods for an IP address

Answer 18

Dynamic or Static

Question 19

True or False: If you have a VM with multiple network interfaces, you can assign a public IP to any of the available NICs

Answer 19

False - only the primary can have a public IP

Question 20

What determines the number of NICs you can create for a VM?

Answer 20

The VM size

Question 21

True or False: You can have a mix of multi NIC and single NIC VMs within an Availability Set

Answer 21

False

Question 22

If you want to change a VM from single NIC to multi NIC, what do you need to do?

Answer 22

Deallocate it and recreate it.

Question 23

How many network security groups can you apply to a given VM, NIC or subnet?

Answer 23

One

Question 24

Azure Load Balancer works at what level of the OSI stack?

Answer 24

Level 4 (transport layer)

Question 25

What networking component functions at Level 7 of the OSI stack?

Answer 25

Application Gateway

Question 26

Connecting to endpoints that are close to you geographically is a benefit of what network component?

Answer 26

Traffic Manager

Question 27

Azure uses ________ networking so that each DNS query is answered by the closest available DNS server

Answer 27

anycast

Question 28

Is Azure DNS authoritative or recursive?

Answer 28

authoritative

Question 29

True or False: You can have only one load balanced public IP address assigned to a set of virtual machines

Answer 29

False - you can have multiple IPs assigned

Question 30

What are the elements of the 5-tuple hash used by Load Balancer?

Answer 30

Source IP, Source Port, Destination IP, Destination Port, Protocol

Question 31

What are the three types of probes for service monitoring by a Load Balancer?

Answer 31

Guest Agent, HTTP custom, TCP custom

Question 32

How is Traffic Manager different from Load Balancer?

Answer 32

Traffic Manager works at the DNS level - after helping a client to resolve the DNS query to an IP address, the client connects to the resource directly. Traffic Manager does not see the traffic passing between client and server

Question 33

An Application Gateway default probe considers any HTTP status between ___ and ___ to be a healthy response

Answer 33

200 and 399

Question 34

When peering VNets, how is traffic between virtual machines routed?

Answer 34

Through Microsoft backbone infrastructure using PRIVATE IP addresses only

Question 35

True or False: Virtual Network peering is transitive

Answer 35

False. If you peer A to B and B to C, you must also peer A to C. VNet-VNet VPN *is* transitive