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Difficulty: MediumFirst Hop Redundancy Protocols (HSRP and VRRP)

A network administrator is designing default gateway redundancy for VLAN 50 using HSRPv1 and VRRPv2 across Cisco IOS switches. Which two statements correctly describe default operational behaviors or attributes of these protocols?

  1. VRRPv2 enables preemption by default, allowing a higher-priority backup router to immediately assume the Master role upon startup.Answer
  2. HSRPv1 uses the virtual MAC address structure 0000.0c07.acXX0000.0c07.acXX, where XXXX represents the group number in hexadecimal format.Answer
  3. C
    HSRPv1 permits assigning the active router's physical interface IP address as the group's virtual IP address.
  4. D
    VRRPv2 disables preemption by default, requiring explicit configuration to enable failover to a higher-priority router.

Answer

The two correct statements are that VRRPv2 enables preemption by default, allowing a higher-priority router to assume the Master role, and that HSRPv1 uses the virtual MAC address format 0000.0c07.acXX with the group number encoded in hexadecimal.
VRRPv2 enables preemption by default, enabling higher priority devices to immediately claim the Master role upon boot. Additionally, HSRPv1 uses the well-known virtual MAC prefix 0000.0c07.acXX, where XX represents the HSRP group number encoded in two hexadecimal digits.

Step-by-Step Solution

1
Evaluate preemption defaults for HSRPv1 and VRRPv2.
HSRPv1 has preemption disabled by default, whereas VRRPv2 has preemption enabled by default.
Understanding default preemption prevents unexpected active/master router elections after node reboots.
2
Analyze virtual MAC address structure for HSRPv1.
HSRPv1 uses 0000.0c07.acXX (where XX is the group number in hex), whereas VRRPv2 uses 0000.5e00.01XX.
Proper identification of FHRP MAC address formats is required for troubleshooting L2 MAC address tables.
3
Verify virtual IP address assignment constraints.
HSRP prohibits setting the virtual IP equal to a router's physical IP, while VRRP allows the master router to IP-address-own the virtual IP.
Distinguishes Virtual Router IP ownership capabilities between HSRP and VRRP.

Key Concept

HSRPv1 and VRRPv2 default operational parameters and virtual MAC structures
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Topics

First Hop Redundancy Protocols (HSRP and VRRP)

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