Which of these is an FHRP that Cisco designed to allow multiple active forwarders to load-balance outgoing traffic?
- VRRP
- GLBP
- OSPF
- EIGRP
- HSRP
Explanation: The Gateway Load Balancing Protocol (GLBP) is a Cisco-proprietary First Hop Redundancy Protocol (FHRP) specifically designed to overcome the limitations of older protocols like HSRP and VRRP. While HSRP and VRRP provide redundancy by having multiple routers act as a single virtual gateway, they typically only allow one router to actively forward traffic while others remain in a standby or backup state.
GLBP, however, allows for multiple active forwarders to share the load of outgoing traffic from the LAN. It accomplishes this by balancing the host load across multiple uplinks, which provides significantly better bandwidth utilization and scalability at the distribution layer. In contrast, OSPF and EIGRP are Interior Gateway Protocols (IGPs) used for dynamic routing between routers, rather than providing default gateway redundancy for end hosts.
Related exam: Modules 1 – 7: Checkpoint Exam: Network Switching Answers (CCNP ENCOR v9)
