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Difficulty: MediumHigh Availability and Redundancy Concepts

A network administrator is designing a high-availability infrastructure for a mission-critical application server cluster. The design must provide Layer 2 link bandwidth aggregation with failure protection between switches, as well as Layer 3 active-standby gateway redundancy for host workstations on the local subnet. Which TWO of the following protocols or configurations should be deployed to satisfy these requirements?

  1. Implement Virtual Router Redundancy Protocol (VRRP) on the Layer 3 switches to present a shared Virtual IP (VIP) address as the default gateway.Answer
  2. Configure Link Aggregation Control Protocol (LACP / IEEE 802.3ad) on switch uplink ports to combine multiple physical links into a single logical trunk.Answer
  3. C
    Configure host workstations to use the unique physical IP address of the primary active router interface as their default gateway.
  4. D
    Set the Spanning Tree Protocol (STP) bridge priority value on both core switches to 61440 to maximize failure recovery speed.
  5. E
    Enable Port Address Translation (PAT) on host network adapters to balance outbound subnet traffic across separate default gateways.

Answer

The correct choices are deploying Virtual Router Redundancy Protocol (VRRP) to provide a Virtual IP default gateway and configuring Link Aggregation Control Protocol (LACP) to combine physical links into a redundant logical trunk.
To satisfy both Layer 2 and Layer 3 high availability requirements, an administrator must combine link aggregation and default gateway redundancy. Deploying Virtual Router Redundancy Protocol (VRRP) allows multiple Layer 3 switches to share a single Virtual IP (VIP), ensuring host default gateway traffic seamlessly switches to a standby router upon hardware failure. Configuring Link Aggregation Control Protocol (LACP / IEEE 802.3ad) aggregates multiple physical interfaces between network switches into a single logical channel, providing both elevated throughput and automatic Layer 2 path redundancy if an individual cable or port fails.

Step-by-Step Solution

1
Identify the Layer 3 default gateway redundancy requirement.
Recognize that First Hop Redundancy Protocols (FHRPs) such as VRRP or HSRP present a unified Virtual IP (VIP) to end hosts, allowing dynamic active-standby gateway failover.
Endpoints configured with a shared VIP maintain gateway access even if one physical router interface fails.
2
Identify the Layer 2 link aggregation and bandwidth redundancy requirement.
Select LACP (IEEE 802.3ad) as the protocol designed to bundle multiple physical Ethernet links between switches into a single logical Ethernet channel.
LACP dynamically negotiates link aggregation, allowing traffic load balancing across links and automatic link recovery if a physical port drops.

Key Concept

High Availability and Redundancy Concepts
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High Availability and Redundancy Concepts

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