Azure Loadbalancing Flashcards Preview

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Flashcards in Azure Loadbalancing Deck (20)
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1
Q

What load balancing options have we available to us in Azure?

A
  • Azure LB (L4 LB)
  • API Gatweray (L7 LB)
  • Frontdoor
2
Q

What type of LB is Azure Loadbalancer?

A

L4 LB

3
Q

Is Azure LB a internal or external LB?

A

It is both internal and external, you choose one or the other.

4
Q

What define an external or internal LB?

A

The type of ip, external get a IP that is routable to the internet and internal gets and IP routable only to your vNET.

5
Q

With Azure LB can i have both an internal and external front end on same LB?

A

No, the LB can only be internal or external but not both.

6
Q

What is the logical construct on the back end of Azure LB?

A

Backend pool and this is a pool where the incoming traffic is loadbalanced to/

7
Q

What rules have i for loadbalancing?

A
  • NAT
  • LB ruels
  • HA Rules
  • Outbound rules
8
Q

Explain NAT rule?

A

It is a one to one mapping, fort on frontend goes to port on backend.

9
Q

Explain LB rule?

A

This is where the incoming traffic is load balanced to the back end pool.

10
Q

Can I use the Azure LB with say WebApps or Functions?

A

No, its only for VM’s and Scale Sets.

11
Q

If I want to have the Azure LB check and ensure the VM is available on the LB backend pool, what can I do?

A

I can set up a health probe to connect to the port.

12
Q

What types of health probes do i have available in Azure LB?

A

You have
TCP
HTTP
HTTPS

13
Q

What happens when a health probe fails?

A

The Azure LB stops sending traffic to the backend VM

14
Q

Can a VM be a member of two backend pools at the same time?

A

Yes and NO, the VM can be a member of both a single external backend pool and a single internal backend pool at the same time bit not a member of two internal or two external backend pools at the the same time.

15
Q

Is there only one type of Azure LB?

A

There are two SKU,

  • Basic (300 VM’s, one availability set, no https health probes)
  • Standard ( 1000 VM’s, more then a single availability sets, TCP, HTTP and HTTPS health probes)
16
Q

I have two groups of VM’s in two different vNET’s I want to load balance them, can I use Azure laod balancer to load balancer across vNET’s?

A

No, your backend pool has to be in a single vNET.

17
Q

Has Azure load balancer front end port and backend port to be the same?

A

No they can be different

18
Q

How dose the Azure LB distribute the traffic?

A

It hashes the SRC IP, DST IP , SRC Port, DST Port, protocol to define what backend VM to connect to.

19
Q

Is Azurre load balancer IPv4 only?

A

No, it supports IPv4 and IPv6

20
Q

Is the Azure load balancer using round robin to distribute the traffic?

A

No, it use the Tuples of the

  • SRC IP
  • DET IP
  • SRC Port
  • DST Port
  • Protocol