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Questions and Answers
What happens when cross-zone load balancing is enabled?
What happens when cross-zone load balancing is enabled?
- Traffic is distributed only in its Availability Zone.
- Traffic is distributed across all registered targets in all enabled Availability Zones. (correct)
- Traffic is equally distributed among the load balancer nodes.
- Traffic is distributed solely to the targets in the lowest traffic zone.
Which load balancers have cross-zone load balancing enabled by default?
Which load balancers have cross-zone load balancing enabled by default?
- Application Load Balancers (correct)
- Network Load Balancers
- Classic Load Balancers
- Gateway Load Balancers (correct)
When cross-zone load balancing is disabled, how is traffic distributed among targets in different Availability Zones?
When cross-zone load balancing is disabled, how is traffic distributed among targets in different Availability Zones?
- Equally across all connected load balancer nodes.
- Equally, regardless of the number of targets.
- Only through the primary Availability Zone.
- Based on the number of registered targets in each zone. (correct)
What percentage of traffic does each target in Availability Zone A receive when cross-zone load balancing is disabled and there are three targets in that zone?
What percentage of traffic does each target in Availability Zone A receive when cross-zone load balancing is disabled and there are three targets in that zone?
In the case of disabled cross-zone load balancing, how much traffic does each target in Availability Zone B receive if there are two targets registered?
In the case of disabled cross-zone load balancing, how much traffic does each target in Availability Zone B receive if there are two targets registered?
Which statement is true about Gateway Load Balancers regarding cross-zone load balancing?
Which statement is true about Gateway Load Balancers regarding cross-zone load balancing?
What is the primary purpose of cross-zone load balancing?
What is the primary purpose of cross-zone load balancing?
What is the typical traffic distribution behavior of the load balancer when cross-zone load balancing is disabled?
What is the typical traffic distribution behavior of the load balancer when cross-zone load balancing is disabled?
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Study Notes
Cross-Zone Load Balancing Overview
- Cross-zone load balancing allows load balancer nodes to distribute traffic across all registered targets in enabled Availability Zones.
- When disabled, traffic distribution is limited to targets in the same Availability Zone as the load balancer node.
Application Load Balancers
- Cross-zone load balancing is always enabled for Application Load Balancers, ensuring even traffic distribution.
Network and Gateway Load Balancers
- For Network Load Balancers and Gateway Load Balancers, cross-zone load balancing is disabled by default, requiring manual activation for broader traffic distribution.
Traffic Distribution When Disabled
- In a scenario with cross-zone load balancing disabled:
- Each of the three targets in Availability Zone A receives 16.6% of total traffic.
- Each of the two targets in Availability Zone B receives 25% of total traffic, leading to imbalanced traffic if zones have unequal targets.
Traffic Distribution When Enabled
- When cross-zone load balancing is enabled, traffic is distributed more evenly across all available targets in all enabled Availability Zones, improving overall resource utilization.
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