Load Balancing Flashcards

1
Q

What is a Load Balancer?

A

A virtual Machine that balances loads. 3 types.

1) Application
2) Network
3) Classic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Application Load Balancer:

A

Best suited for loading balancing HTTP and HTTPS traffic.
Operate at layer 7.
Can create advanced request routing.
Send specific requests to a specific host.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Network Load Balancer:

A

Best suited for load balancing TCP traffic.
Operates at layer 4.
Used when you require ultra low latencies.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Classic Load Balancer:

A

Classic are also called Elastic Load Balancers.
These are legacy elastic load balancers.
* You can use HTTP/HTTPS
* You can see layer 7 or Layer 4.
* It leverages x-forwarded-for headers.(shows public IPv4 addresses)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Load Balancer : 504 error

A

This is a gateway timeout and it means that the application is not responding within the idle timeout period.
Check: Application, web server or database server.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the IP address of your Elastic load balancer?

A

There are no IP addresses associated with ELBs, they use DNS names only.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How are instances monitored by ELB reported?

A

1) InService (functioning)

2) OutOfService (Not functioning)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly