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HSRP Flashcards Study List

Q: What is the primary objective of the Hot Standby Router Protocol (HSRP)?
A: To provide network redundancy for IP networks by ensuring transparent recovery from first-hop failures.
Q: How do routers participating in HSRP appear to hosts on a local area network?
A: They appear as a single virtual router sharing a single IP and MAC address.
Q: What is the limitation of using Proxy ARP for router redundancy if a router fails?
A: The host continues sending packets to the failed router's MAC address until the ARP entry times out or the host reboots.
Q: Why is running dynamic routing protocols like RIP on every host often impractical?
A: It involves high administrative and processing overhead, security issues, and lack of protocol support on all platforms.
Q: What is the main drawback of using RIP for host-level router discovery?
A: It is slow to adapt to changes in the network topology.
Q: In ICMP Router Discovery Protocol (IRDP), how does a host detect that its configured router is unavailable?
A: The host stops receiving periodic hello multicast messages from the router.
Q: Why is the default IRDP configuration unsuitable for rapid first-hop failure detection?
A: The default advertisement rate is only every 7 to 10 minutes, with a 30-minute lifetime.
Q: What is the limitation of DHCP regarding router redundancy?
A: DHCP provides a default gateway but lacks a mechanism to switch to an alternative if that gateway fails.
Q: In an HSRP group, what is the role of the 'Active' router?
A: It is responsible for forwarding packets sent by hosts to the virtual router.
Q: What happens to the 'Standby' router if the 'Active' router fails?
A: The Standby router assumes the packet-forwarding duties of the Active router.

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