An engineer must design a high-availability solution that provides path redundancy for IP by allowing redundant gateways to share MAC protocols and addresses. A group of Layer 3 routers must be allowe

The correct answer is A. GLBP. In Cisco high-availability LAN gateway designs, the requirement is: Multiple L3 gateways sharing a virtual MAC and virtual IP Ability to load balance across multiple active gateways Capability to seamlessly take over gateway forwarding during a failure Among Cisco First Hop Redun

Cloud Infrastructure Design

Question

An engineer must design a high-availability solution that provides path redundancy for IP by allowing redundant gateways to share MAC protocols and addresses. A group of Layer 3 routers must be allowed to share the default gateway on a LAN, load balance, and seamlessly take over the traffic transfer role if a router in the group fails. What must be used?

Options

AGLBP
BLoad balancer
CRouted network core
DBFD

How the community answered

(41 responses)

A
85% (35)
B
2% (1)
C
2% (1)
D
10% (4)

Explanation

In Cisco high-availability LAN gateway designs, the requirement is: Multiple L3 gateways sharing a virtual MAC and virtual IP Ability to load balance across multiple active gateways Capability to seamlessly take over gateway forwarding during a failure Among Cisco First Hop Redundancy Protocols (FHRPs): HSRP Active/standby only VRRP Active/standby only GLBP (Gateway Load Balancing Protocol) The only FHRP providing active/active load balancing GLBP allows multiple routers to share: A common virtual IP Multiple virtual MAC addresses Multiple active forwarders that load-balance end hosts Automatic failover if any gateway fails Thus, GLBP is the only correct protocol matching the requirement for redundant default gateways with load balancing and shared MAC addressing.

Topics

#GLBP#first-hop redundancy#gateway load balancing#HA design

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