200-150 · Question #213
Which statement about FHRP protocols is true?
The correct answer is B. If HSRP priority is not configured, then the router with the highest IP address in the group is. In HSRP, when all routers in the group use the default priority value (100), the router with the highest IP address wins the active router election.
Question
Which statement about FHRP protocols is true?
Options
- AGLBP group member routers respond to ARP requests by providing their physical MAC
- BIf HSRP priority is not configured, then the router with the highest IP address in the group is
- CVRRP and GLBP are standards-based protocols
- DVRRP provides load balancing by sharing the same virtual MAC address on all VRRP routers
How the community answered
(47 responses)- A9% (4)
- B74% (35)
- C13% (6)
- D4% (2)
Why each option
In HSRP, when all routers in the group use the default priority value (100), the router with the highest IP address wins the active router election.
GLBP members respond to ARP requests with different virtual MAC addresses (one per Active Virtual Forwarder), not physical MACs - this virtual MAC distribution is how GLBP achieves load balancing.
HSRP uses a priority value (default 100) to elect the active router, and when priorities are equal - as they are when not explicitly configured - the tiebreaker is the highest IP address among group members. This IP-based tiebreaker is a fundamental HSRP election behavior that ensures a deterministic active router is selected.
VRRP is an open standard defined in RFC 5798, but GLBP is a Cisco-proprietary protocol; therefore they cannot both be described as standards-based protocols.
VRRP does not provide load balancing - only one VRRP router is active at a time while others remain standby. Load balancing across multiple forwarders is a feature of GLBP, not VRRP.
Concept tested: HSRP active router election with default priority
Source: https://www.cisco.com/c/en/us/support/docs/ip/hot-standby-router-protocol-hsrp/9234-hsrpguidetoc.html
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