Refer to the exhibit.
Host A has sent an ARP message to the default gateway IP address 10.10.10.1. Which statement
is true?
A.
Because of the invalid timers that are configured, DSw1 does not reply.
B.
DSw1 replies with the IP address of the next AVF.
C.
DSw1 replies with the MAC address of the next AVF.
D.
Because of the invalid timers that are configured, DSw2 does not reply.
E.
DSw2 replies with the IP address of the next AVF.
F.
DSw2 replies with the MAC address of the next AVF.
Explanation:
The Gateway Load Balancing Protocol (GLBP) is a Cisco-proprietary protocol designed to
overcome the limitations of existing redundant router protocols. Some of the concepts are the
same as with HSRP/VRRP, but the terminology is different and the behavior is much more
dynamic and robust.
The trick behind this load balancing lies in the GLBP group. One router is elected the active virtual
gateway (AVG). This router has the highest priority value, or the highest IP address in the group, if
there is no highest priority. The AVG answers all ARP requests for the virtual router address.Which MAC address it returns depends on which load-balancing algorithm it is configured to use.
In any event, the virtual MAC address supported by one of the routers in the group is returned.
According to exhibit, Router Company2 is the Active Virtual Gateway (AVG) router because it has
highest IP address even having equal priority. When router Company1 sends the ARP message to
10.10.10.1 Router Company2 will reply to Company1 as a Active Virtual Router.
Reference: Configuring GLBP
(http://www.cisco.com/en/US/docs/ios/ipapp/configuration/guide/ipapp_glbp.html)