Refer to the exhibit. The Gateway Load Balancing Protocol has been configured on routers R1 and R2, and hosts A and B have been configured as shown. Which statement can be derived from the exhibit?
A.
The host A default gateway has been configured as 10.88.1.10/24.
B.
The GLBP weighted load balancing mode has been configured.
C.
The GLBP round-robin, load-balancing mode has been configured.
D.
The GLBP host-dependent, load-balancing mode has been configured.
E.
The host A default gateway has been configured as 10.88.1.1/24.
F.
The host A default gateway has been configured as 10.88.1.4/24.
Explanation:
To provide a virtual router, multiple switches (routers) are assigned to a common GLBP group. Rather than having just one active router performing forwarding for the virtual router address, all routers in the group can participate and offer load balancing by forwarding a portion of the overall traffic.
The advantage is that none of the clients have to be pointed toward a specific gateway address-they can all have the same default gateway set to the virtual router IP address. The load balancing is provided completely through the use of virtual router MAC addresses in ARP replies returned to the clients. As a client sends an ARP request looking for the virtual router address, GLBP sends back an ARP reply with the virtual MAC address of a selected router in the group. The result is that all clients use the same gateway address but have differing MAC addresses for it.
There’s just not enough information in the diagram to know the correct answer. A-D are all possible; E is unlikely and F must be wrong.
Maybe something is missing from the diagram?
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If it had said “ARPs for default gateway gets MAC 0000.0000.0001”, it would have been a valid question.
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