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Zorluk: OrtaFirst Hop Redundancy Protocols (HSRP and VRRP)

A network engineer is comparing default operational behaviors between HSRPv1 and VRRPv2 across Cisco IOS switches. Which two statements accurately describe default characteristics and protocol specifications of these First Hop Redundancy Protocols? (Choose two.)

  1. VRRPv2 has preemption enabled by default, whereas HSRPv1 has preemption disabled by default.Cevap
  2. B
    HSRPv1 allows the virtual IP address to be configured using an IP address already assigned to a router's physical interface, whereas VRRPv2 explicitly rejects this configuration.
  3. VRRPv2 generates virtual MAC addresses using the prefix 0000.5E00.01xx, whereas HSRPv1 uses the prefix 0000.0C07.ACxx.Cevap
  4. D
    HSRPv1 sends hello messages to multicast address 224.0.0.18, whereas VRRPv2 sends advertisements to multicast address 224.0.0.2.

Cevap

The two correct statements are that VRRPv2 has preemption enabled by default while HSRPv1 has it disabled by default, and VRRPv2 uses virtual MAC addresses formatted as 0000.5E00.01xx while HSRPv1 uses 0000.0C07.ACxx.
VRRPv2 enables preemption by default and uses the virtual MAC prefix 0000.5E00.01xx. HSRPv1 disables preemption by default and uses the virtual MAC prefix 0000.0C07.ACxx.

Adım Adım Çözüm

1
Evaluate default preemption state for HSRP and VRRP.
HSRPv1/v2 has preemption disabled by default (the active router remains active even if a higher-priority router joins). VRRPv2 has preemption enabled by default.
Protocol design choices differ regarding default failback behavior.
2
Analyze virtual MAC address structure for both protocols.
HSRPv1 uses 0000.0C07.ACxx, HSRPv2 uses 0000.0C9F.Fxxx, and VRRPv2 uses 0000.5E00.01xx.
Standardized virtual MAC ranges allow switches to map the virtual IP to unique Ethernet source/destination addresses.
3
Verify virtual IP matching constraints and multicast addresses.
VRRPv2 allows assigning a physical IP as virtual IP (IP address owner). HSRPv1 rejects assigning an interface's physical IP as the virtual IP. HSRPv1 uses multicast 224.0.0.2; VRRPv2 uses multicast 224.0.0.18.
Reversing these rules helps identify common misconceptions regarding protocol multicast endpoints and interface IP assignments.

Anahtar Kavram

HSRPv1 vs VRRPv2 Default Behaviors, Preemption, and Virtual Addressing
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Konular

First Hop Redundancy Protocols (HSRP and VRRP)

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