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Difficulty: EasyHigh Availability and Redundancy Concepts

A network administrator implements a First Hop Redundancy Protocol (FHRP) across two core routers to maintain continuous gateway accessibility for end-user workstations. Which IP address must be assigned as the default gateway on the workstations to achieve seamless failover?

  1. The virtual IP address assigned to the redundancy groupAnswer
  2. B
    The physical IP address of the primary active router interface
  3. C
    The IP address of the switch designated as the Spanning Tree Protocol root bridge
  4. D
    The loopback interface IP address of the backup router

Answer

The virtual IP address assigned to the redundancy group
The correct option is the shared virtual IP address. First Hop Redundancy Protocols present a single virtual gateway IP and virtual MAC address to the local network segment. When end-user workstations use the virtual IP as their default gateway, active/standby router state changes occur transparently without breaking client connectivity.

Step-by-Step Solution

1
Identify the purpose of First Hop Redundancy Protocols (FHRPs) such as HSRP or VRRP.
FHRPs allow multiple physical routers to collaborate and present a single virtual router identity to local hosts.
This abstract layer allows client devices to send default gateway traffic to a consistent virtual address regardless of individual physical router status.
2
Determine the proper workstation TCP/IP network configuration for default gateways in an FHRP environment.
Workstations must point to the shared Virtual IP (VIP).
If the active physical router fails, the standby physical router assumes control of the Virtual IP, keeping default gateway traffic flowing without requiring changes on client endpoints.

Key Concept

FHRP Virtual Gateway IP Configuration
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Topics

High Availability and Redundancy Concepts

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