Cisco
200-150 · Question #156
200-150 Question #156: Real Exam Question with Answer & Explanation
The correct answer is A: The AVG responds by using one of the virtual MAC addresses.. In GLBP, the Active Virtual Gateway (AVG) handles all ARP replies for the virtual IP, responding with a virtual MAC address to distribute load across the Active Virtual Forwarders (AVFs).
Cisco Data Center Network Services
Question
How does a GLBP cluster respond to a host ARP request for the virtual IP address?
Options
- AThe AVG responds by using one of the virtual MAC addresses.
- BThe highest priority AVF responds by using its own hardware MAC address.
- CThe least utilized router responds by using its own virtual MAC address.
- DThe AVG responds by using its own hardware MAC address.
Explanation
In GLBP, the Active Virtual Gateway (AVG) handles all ARP replies for the virtual IP, responding with a virtual MAC address to distribute load across the Active Virtual Forwarders (AVFs).
Common mistakes.
- B. AVFs forward traffic using their assigned virtual MAC addresses, not their own hardware MACs, and they do not respond to ARP requests - only the AVG handles ARP for the virtual IP.
- C. GLBP load balancing is controlled by the AVG assigning virtual MACs in a round-robin or weighted manner; individual routers do not independently respond to ARP based on their utilization.
- D. The AVG responds with a virtual MAC address, not its own hardware MAC address - using its hardware MAC would prevent load balancing because all hosts would send traffic to only one physical router.
Concept tested. GLBP AVG ARP response and virtual MAC assignment
Topics
#GLBP#AVG#virtual MAC#ARP response
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