Azure Loadbalancing Flashcards
What load balancing options have we available to us in Azure?
- Azure LB (L4 LB)
- API Gatweray (L7 LB)
- Frontdoor
What type of LB is Azure Loadbalancer?
L4 LB
Is Azure LB a internal or external LB?
It is both internal and external, you choose one or the other.
What define an external or internal LB?
The type of ip, external get a IP that is routable to the internet and internal gets and IP routable only to your vNET.
With Azure LB can i have both an internal and external front end on same LB?
No, the LB can only be internal or external but not both.
What is the logical construct on the back end of Azure LB?
Backend pool and this is a pool where the incoming traffic is loadbalanced to/
What rules have i for loadbalancing?
- NAT
- LB ruels
- HA Rules
- Outbound rules
Explain NAT rule?
It is a one to one mapping, fort on frontend goes to port on backend.
Explain LB rule?
This is where the incoming traffic is load balanced to the back end pool.
Can I use the Azure LB with say WebApps or Functions?
No, its only for VM’s and Scale Sets.
If I want to have the Azure LB check and ensure the VM is available on the LB backend pool, what can I do?
I can set up a health probe to connect to the port.
What types of health probes do i have available in Azure LB?
You have
TCP
HTTP
HTTPS
What happens when a health probe fails?
The Azure LB stops sending traffic to the backend VM
Can a VM be a member of two backend pools at the same time?
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.
Is there only one type of Azure LB?
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)
