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Difficulty: EasyHigh Availability and Redundancy Concepts

A network technician is deploying a pair of redundant routers to provide seamless default gateway redundancy for a local user subnet. Which TWO of the following steps are required to ensure hosts maintain uninterrupted default gateway access during a router failure?

  1. Configure a First Hop Redundancy Protocol (FHRP) such as HSRP or VRRP to share a Virtual IP (VIP) address between both routers.Answer
  2. Configure the client host machines on the subnet to use the Virtual IP (VIP) address as their default gateway.Answer
  3. C
    Configure half of the host machines to use the physical IP address of the first router and the remaining half to use the physical IP address of the second router.
  4. D
    Set the Spanning Tree Protocol (STP) priority on the active default gateway router to 65535 to force it to become the root bridge.
  5. E
    Assign a different Virtual IP (VIP) address to each router interface within the local subnet network boundary.

Answer

To ensure host devices maintain default gateway connectivity during a failure, a First Hop Redundancy Protocol (FHRP) must be configured to generate a shared Virtual IP (VIP) address across the redundant routers, and the host devices must be configured to point to that Virtual IP as their default gateway address.
High availability at Layer 3 requires a First Hop Redundancy Protocol (such as HSRP or VRRP) to present a single logical gateway identity represented by a Virtual IP (VIP) address. Client devices configured to use this VIP as their default gateway remain unaware of physical hardware failures because the backup router automatically assumes control of the VIP upon primary router failure.

Step-by-Step Solution

1
Identify the mechanism used for first-hop router redundancy.
Recognize that protocols like HSRP or VRRP bind multiple physical routers together into a virtual group with a single shared Virtual IP (VIP).
FHRP protocols enable automatic state tracking and failover of gateway responsibilities.
2
Determine proper client host gateway configuration.
Ensure all client hosts point their default gateway IP address to the Virtual IP address rather than any single physical router interface IP.
If hosts point to the VIP, traffic automatically routes through whichever physical router is actively handling the VIP.

Key Concept

First Hop Redundancy Protocols (FHRP) and Virtual IP (VIP) Default Gateway Assignment
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Topics

High Availability and Redundancy Concepts

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