Which first hop redundancy protocol ensures that load balancing occurs over multiple routers using an angle virtual IP address and multiple Virtual MAC addresses?

Which first hop redundancy protocol ensures that load balancing occurs over multiple routers using an angle virtual IP address and multiple Virtual MAC addresses?
A . GLBP
B . VRRP
C . HSRP
D . IRDP

View Answer

Answer: A

Explanation:

GLBP is a first-hop redundancy protocol designed by Cisco that allows packet load sharing among groups of redundant routers.

When HSRP or VRRP is used to provide default-gateway redundancy, the backup members of the peer relationship are idle, waiting for a failure event to occur before they take over and actively forward traffic. Methods to use backup uplinks with HSRP or VRRP are difficult to implement and manage. In one technique, the HSRP and STP or RSTP roots alternate between distribution node peers, with the even VLANs homed on one peer and the odd VLANs homed on the alternate. Another technique uses multiple HSRP groups on a single interface and uses DHCP to alternate between the multiple default gateways. These techniques work but are not optimal from a configuration, maintenance, or management perspective.

GLBP provides all the benefits of HSRP and includes load balancing, too. For HSRP, a single virtual MAC address is given to the endpoints when the endpoints use Address Resolution Protocol (ARP) to learn the physical MAC address of their default gateways. GLBP allows a group of routers to function as one virtual router by sharing one virtual IP address while using multiple virtual MAC addresses for traffic forwarding.