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AZ-100 Study > Virtual Networks > Flashcards

Virtual Networks Flashcards

1
Q

A vNet contains at least how many subnets?

A

One

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2
Q

What is the maximum length for a vNet name?

A

80 characters

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3
Q

Network Security Groups can be assigned to what?

A

subnets and network interfaces

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4
Q

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

A

Nothing - they can see each other by default

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5
Q

You should use your own DNS implementation under what circumstances?

A

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

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6
Q

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

A

They are not available for use

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7
Q

What are the two types of load balancers in Azure?

A

Public and Internal

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8
Q

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

A

False

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9
Q

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

A

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

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10
Q

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

A

50, 500

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11
Q

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

A

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

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12
Q

What can a public IP address be assigned to?

A

VM, Load Balancer, VPN Gateway, Application Gateway

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13
Q

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

A

NIC

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14
Q

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

A

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

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15
Q

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

A

VM, Load Balancer

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16
Q

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

A

Basic and Standard

17
Q

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

A

Standard

18
Q

Name the two allocation methods for an IP address

A

Dynamic or Static

19
Q

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

A

False - only the primary can have a public IP

20
Q

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

A

The VM size

21
Q

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

A

False

22
Q

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

A

Deallocate it and recreate it.

23
Q

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

A

One

24
Q

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

A

Level 4 (transport layer)

25
Q

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

A

Application Gateway

26
Q

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

A

Traffic Manager

27
Q

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

A

anycast

28
Q

Is Azure DNS authoritative or recursive?

A

authoritative

29
Q

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

A

False - you can have multiple IPs assigned

30
Q

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

A

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

31
Q

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

A

Guest Agent, HTTP custom, TCP custom

32
Q

How is Traffic Manager different from Load Balancer?

A

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

33
Q

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

A

200 and 399

34
Q

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

A

Through Microsoft backbone infrastructure using PRIVATE IP addresses only

35
Q

True or False: Virtual Network peering is transitive

A

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

AZ-100 Study (4 decks)

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