200-150 · Question #225
Which statement about First Hop Redundancy Protocols is true?
The correct answer is D. They always require a minimum of three IP addresses. First Hop Redundancy Protocols require at least three IP addresses: one for each participating router interface plus one shared virtual IP used as the default gateway.
Question
Which statement about First Hop Redundancy Protocols is true?
Options
- AThey ensure a loop-free logical topology.
- BThey use multicast to communicate hello messages with each other.
- CThey ensure a loop-free physical topology.
- DThey always require a minimum of three IP addresses.
How the community answered
(46 responses)- A4% (2)
- B2% (1)
- C2% (1)
- D91% (42)
Why each option
First Hop Redundancy Protocols require at least three IP addresses: one for each participating router interface plus one shared virtual IP used as the default gateway.
Ensuring a loop-free logical topology is the function of Spanning Tree Protocol (STP), not FHRPs.
While HSRP uses multicast addresses for hello messages, not all FHRP implementations universally rely on multicast, making this statement not universally true across all FHRPs.
A loop-free physical topology is a physical cabling and Layer 2 concern addressed by STP, not by FHRPs.
In a standard FHRP deployment such as HSRP or VRRP, a minimum of three IP addresses are required: one for the active router interface, one for the standby router interface, and one virtual IP address that downstream hosts use as their default gateway. This three-address minimum holds regardless of which specific FHRP implementation is used.
Concept tested: First Hop Redundancy Protocol IP address requirements
Source: https://www.cisco.com/c/en/us/tech/ip/first-hop-redundancy-protocols-fhrp/index.html
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