200-301 · Question #991
What is the purpose of using First Hop Redundancy Protocol on a specific subnet?
The correct answer is D. forwards multicast hello messages between routers. This question asks about a core operational mechanism used by First Hop Redundancy Protocols (FHRPs) to maintain redundancy.
Question
Options
- Aensures a loop-free physical topology
- Bfilters traffic based on destination IP addressing
- Csends the default route to the hosts on a network
- Dforwards multicast hello messages between routers
How the community answered
(56 responses)- A4% (2)
- B2% (1)
- C2% (1)
- D93% (52)
Why each option
This question asks about a core operational mechanism used by First Hop Redundancy Protocols (FHRPs) to maintain redundancy.
Ensuring a loop-free physical topology is the primary role of Spanning Tree Protocol (STP), not First Hop Redundancy Protocols (FHRP).
Filtering traffic based on destination IP addressing is typically performed by Access Control Lists (ACLs) or firewall rules, not by FHRPs.
While FHRP provides a virtual default gateway for hosts, the protocol itself does not 'send' the default route; hosts are configured with the virtual IP as their gateway, often via DHCP or static assignment.
FHRPs, such as HSRP and VRRP, use multicast hello messages exchanged between redundant routers to discover each other, elect active/standby roles, and monitor the health of the group. This communication is essential for the protocol's operation.
Concept tested: FHRP operational mechanisms (hello messages)
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/xe-16/fhrp-xe-16-book/fhrp-hsrp.html
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