200-301 - IP Connectivity - Section 3.5
Describe the purpose, functions, and concepts of first hop redundancy protocols such as HSRP.
Explain how a first hop redundancy protocol lets two or more routers share a single virtual IP and virtual MAC so hosts keep one default gateway even when the active router fails. Describe the active/standby roles, the role of priority and preemption in choosing the forwarder, and how the standby takes over the virtual address transparently to end devices.
First hop redundancy protocolHSRPVirtual IP and virtual MACActive/standby rolesPriority and preemption
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