Refer to the exhibit.
Both routers are configured for the GLBP. Which statement is true?
A.
The default gateway addresses of both hosts should be set to the IP addresses of both
routers.
B.
The default gateway address of each host should be set to the virtual IP address.
C.
The hosts learn the proper default gateway IP address from router A.
D.
The hosts have different default gateway IP addresses and different MAC addresses for
each router.
Explanation:
GLBP performs a similar, but not identical, function for the user as the HSRP and VRRP.
Both HSRP and VRRP protocols allow multiple routers to participate in a virtual router group
configured with a virtual IP address. One member is elected to be the active router to
forward packets sent to the virtual IP address for the group. The other routers in the group
are redundant until the active router fails. With standard HSRP and VRRP, these standby
routers pass no traffic in normal operation – which is wasteful. Therefore the concept cam
about for using multiple virtual router groups, which are configured for the same set of
routers. But to share the load, the hosts must be configured for different default gateways,
which results in an extra administrative burden of going around and configuring every host
and creating 2 or more groups of hosts that each use a different default gateway.
GLBP is similar in that it provides load balancing over multiple routers (gateways) – but it can
do this using only ONE virtual IP address!!! Underneath that one virtual IP address is
multiple virtual MAC addresses, and this is how the load is balanced between the routers.
Instead of the hassle of configuring all the hosts with a static Default Gateway, you can lket
them use ARP’s to find their own. Multiple gateways in a “GLBP redundancy group” respond
to client Address Resolution Protocol (ARP) requests in a shared and ordered fashion, each
with their own unique virtual MAC addresses. As such, workstation traffic is divided across
all possible gateways. Each host is configured with the same virtual IP address, and all
routers in the virtual router group participate in forwarding packets
Reference:
HSRP, GLBP, and VRRP
http://www.infocellar.com/networks/Routers/HSRP-GLBP-VRRP.htm