Cross-zone load balancing in AWS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is cross-zone load balancing in AWS Elastic Load Balancer?

Cross-zone load balancing evenly distributes incoming traffic across all registered targets in all enabled Availability Zones, helping to balance load and improve fault tolerance.

beginner

Why is cross-zone load balancing useful?

It prevents uneven traffic distribution when some zones have more targets than others, ensuring better resource utilization and higher availability.

intermediate

How do you enable cross-zone load balancing on an AWS Application Load Balancer?

Cross-zone load balancing is enabled by default on Application Load Balancers and cannot be disabled.

intermediate

Is cross-zone load balancing enabled by default on Classic Load Balancers?

No, on Classic Load Balancers, cross-zone load balancing is disabled by default and must be enabled manually.

advanced

What is a potential cost implication of enabling cross-zone load balancing on Classic Load Balancers?

Enabling cross-zone load balancing on Classic Load Balancers can increase data transfer costs because traffic may cross Availability Zones.

What does cross-zone load balancing do?

A Distributes traffic evenly across all targets in all zones

B Sends traffic only to targets in the same zone

C Blocks traffic from certain zones

D Routes traffic based on IP address only

Cross-zone load balancing distributes incoming traffic evenly across all registered targets in all enabled Availability Zones.

Is cross-zone load balancing enabled by default on AWS Application Load Balancers?

A No, it is not supported

B Yes, and it cannot be disabled

C Yes, but it can be disabled

D No, it must be enabled manually

Application Load Balancers have cross-zone load balancing enabled by default and it cannot be turned off.

What must you do to enable cross-zone load balancing on a Classic Load Balancer?

A Enable it manually in the load balancer settings

B It is enabled by default, no action needed

C Create a new load balancer

D Use an Application Load Balancer instead

Cross-zone load balancing is disabled by default on Classic Load Balancers and must be enabled manually.

What is a downside of enabling cross-zone load balancing on Classic Load Balancers?

A Reduced fault tolerance

B Slower response times

C Increased data transfer costs between zones

D Limited to one Availability Zone

Cross-zone load balancing can increase data transfer costs because traffic may cross Availability Zones.

Which AWS load balancer type has cross-zone load balancing enabled by default and cannot be disabled?

A Gateway Load Balancer

B Classic Load Balancer

C Network Load Balancer

D Application Load Balancer

Application Load Balancers have cross-zone load balancing enabled by default and it cannot be disabled.

Explain what cross-zone load balancing is and why it is important in AWS.

Think about how traffic is shared among servers in different zones.

Describe the differences in cross-zone load balancing behavior between Classic Load Balancers and Application Load Balancers.

Focus on default settings and manual configuration.