Elastic Load Balancers Flashcards

1
Q

Three types of ELB

A

Application
Network
Classic

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2
Q

The load balancer that operates at layer 7

A

Application load balancer

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3
Q

The load balancer that operates at layer 4

A

Network load balancer

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4
Q

the load balancer that operates at both layer 4 and at layer 7

A

Classic load balancer

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5
Q

Which load balancer is best suited when you need to create advanced request routing with HTTP/S traffic?

A

Application load balancer

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6
Q

Which load balancer can send specific types of requests to specific web servers?

A

Application load balancer

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7
Q

When should you use a network load balancer?

A

high volumes of requests per second at ultra-low latencies.

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8
Q

True or false, network load balancers can handle millions of requests per second while maintaining ultra-low latencies

A

True

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9
Q

Which load balancer is the most expensive?

A

Network

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10
Q

Which layer 7 features is the classic load balancer capable of supporting?

A

X-forwarded-for and sticky sessions.

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11
Q

What is the x-forwarded-for feature?

A

Allows you to determin the originating IP address of a request.

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12
Q

True or false: You can pre-warm a load balancer?

A

True. Contact AWS to pre-warm your ELB.

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13
Q

What does AWS need to know to pre-warm your ELB?

A
  1. start and end dates
  2. requests per second
  3. size of a typical request
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14
Q

When would you need to pre-warm your ELB?

A

When you expect sudden and dramatic increase in traffic that will surpass default scaling capabilities of ELB.

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15
Q

Do ALBs provide a static IP when they scale?

A

No. When an ALB scales, it can change the IP address that clients connect to.

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16
Q

Do NLBs provide static IPs when they scale?

A

Yes.

17
Q

If you need to provide layer 7 LB with a static IP, how can this be solved?

A

Place an ALB behind an NLB