In a single broadcast domain, connect three routers via a standard Ethernet switch. STP is the only Layer 2 protocol running on this link. EIGRP is the only Layer 3 protocol running on this link, which uses a standard configuration. Then, one of the three routers is manually shut down. How will the other two routers discover the loss of this neighbor?
The switch will send a reverse ARP when the router disconnects from the switch.
The line protocol on the remaining two routers will be brought down as soon as the carrier is lost from the switch.
The EIGRP dead timers will expire due to the absence of EIGRP traffic.
The switch will bring down the carrier on all ports momentarily to force all the routers connected to the link to relearn their neighbors.
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