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Virtual Router Redundancy (VRRP) Flashcards

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  1. What is the virtual MAC address format used by VRRPv2?

    Answer: 00-00-5E-00-01-{VRID}

    VRRPv2 uses the virtual MAC format 00-00-5E-00-01-{VRID} where VRID is the Virtual Router Identifier in hex.

  2. In VRRPv3, which significant improvement was made over VRRPv2?

    Answer: Support for IPv6 and sub-second advertisement intervals

    VRRPv3 (RFC 5798) added native IPv6 support and allows sub-second advertisement intervals for faster failover.

  3. What VRRP feature can be used to track an upstream interface so the master lowers its priority if the uplink fails?

    Answer: VRRP object tracking

    VRRP object tracking monitors a specified interface or route and decrements the VRRP priority if the tracked object goes down, triggering failover.

  4. When configuring VRRP on Aruba switches with object tracking, what happens to the VRRP master priority when the tracked interface goes down?

    Answer: Priority decreases by the configured decrement value

    When the tracked object fails, the master's priority is reduced by the configured decrement, potentially causing a backup with higher resulting priority to preempt.

  5. In a two-router VRRP setup, both routers report as master simultaneously. What is the most likely cause?

    Answer: The advertisement multicast traffic between the routers is blocked

    A split-brain scenario (dual masters) typically occurs when VRRP advertisement multicasts cannot reach each other, causing each router to believe the other has failed.

  6. Which VRRP priority value is reserved for a router that owns the virtual IP address?

    Answer: 255

    Priority 255 is automatically assigned to the IP address owner (the router whose real IP equals the virtual IP), ensuring it always becomes master.

  7. In an Aruba VRRP deployment, what does a VRRP priority value of 0 in an advertisement indicate?

    Answer: The router is intentionally releasing the master role

    A VRRP advertisement with priority 0 is sent by the current master to signal that it is voluntarily giving up the master role, prompting an immediate election.