Virtual Networks Flashcards
A vNet contains at least how many subnets?
One
What is the maximum length for a vNet name?
80 characters
Network Security Groups can be assigned to what?
subnets and network interfaces
What, if anything, do you need to do to allow two subnets in the same vNet to talk to each other?
Nothing - they can see each other by default
You should use your own DNS implementation under what circumstances?
When using VMs on different vNets (including on-prem and Azure vNet), or when implementing reverse lookup or internal IP addresses
What is special about the first and last three IP addresses in any given subnet?
They are not available for use
What are the two types of load balancers in Azure?
Public and Internal
True or False: It is possible for multiple subscriptions to use the same Azure Virtual Network
False
To connect to an Azure virtual network from an on-premises network, what can you use?
VPN (point-to-site or site-to-site), Express Route
You can have up to ___ vnets per subscription, per region and can increase this up to ___ by contacting support
50, 500
What type of server is a good candidate for a static IP address?
DNS Server, because clients may have trouble locating it if the IP address changed.
What can a public IP address be assigned to?
VM, Load Balancer, VPN Gateway, Application Gateway
On a VM, the IP address (public or private) is assigned to what component?
NIC
True or False: An Application Gateway can have a static public IP address
False (only a private IP address can be static on an App Gateway)
Name the two types of infrastructure that can have a public static IP address
VM, Load Balancer
What are the two types of IP addresses you can provision (not public and private)?
Basic and Standard
Which type of IP address is zone-redundant by default?
Standard
Name the two allocation methods for an IP address
Dynamic or Static
True or False: If you have a VM with multiple network interfaces, you can assign a public IP to any of the available NICs
False - only the primary can have a public IP
What determines the number of NICs you can create for a VM?
The VM size
True or False: You can have a mix of multi NIC and single NIC VMs within an Availability Set
False
If you want to change a VM from single NIC to multi NIC, what do you need to do?
Deallocate it and recreate it.
How many network security groups can you apply to a given VM, NIC or subnet?
One
Azure Load Balancer works at what level of the OSI stack?
Level 4 (transport layer)
What networking component functions at Level 7 of the OSI stack?
Application Gateway
Connecting to endpoints that are close to you geographically is a benefit of what network component?
Traffic Manager
Azure uses ________ networking so that each DNS query is answered by the closest available DNS server
anycast
Is Azure DNS authoritative or recursive?
authoritative
True or False: You can have only one load balanced public IP address assigned to a set of virtual machines
False - you can have multiple IPs assigned
What are the elements of the 5-tuple hash used by Load Balancer?
Source IP, Source Port, Destination IP, Destination Port, Protocol
What are the three types of probes for service monitoring by a Load Balancer?
Guest Agent, HTTP custom, TCP custom
How is Traffic Manager different from Load Balancer?
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
An Application Gateway default probe considers any HTTP status between ___ and ___ to be a healthy response
200 and 399
When peering VNets, how is traffic between virtual machines routed?
Through Microsoft backbone infrastructure using PRIVATE IP addresses only
True or False: Virtual Network peering is transitive
False. If you peer A to B and B to C, you must also peer A to C. VNet-VNet VPN is transitive
