Load balancers

Question 1

What’s a good metaphor for an Network Load Balancer and Application Load Balancer

Answer 1

An NLB is like an uninquisitive bouncer, they don’t really check your details just let you into the club.

An ALB is like an inquisitive library. It checks your library card, the books, and can forward you to the right stack.

Question 2

Where does ALB fit in the OSI Model?

Answer 2

Layer 7 or Application

Question 3

Where does NLB fit in the OSI Model?

Answer 3

Layer 4 or Transport

Question 4

When would you use an NLB?

Answer 4

For TCP/UDP traffic, optimising for performance, or need static IPs

Question 5

When would you use an ALB?

Answer 5

For HTTP traffic, effective routing, running microserves behind the load balancer

Question 6

What are some dynamic load balancing algorithms?

Answer 6

Least connection
Weighted response time
Resource type

Question 7

What are some static load balancing algorithms?

Answer 7

Round robin and weighted round robin, IP hash