After a power failure, several users are unable to connect to network devices at the remote office. Which of the following is the MOST likely cause of the issue?

The correct answer is B. Missing route. When routers lose power and restart, dynamically learned routes (via OSPF, EIGRP, BGP, etc.) are cleared from the routing table and must be re-learned. If a router fails to re-establish those routes - or if static routes were never saved to non-volatile storage - connectivity…

Network troubleshooting

Question

Options

ABad cable
BMissing route
CDuplicate IP address
DSwitching loop

How the community answered

(41 responses)

A
12% (5)
B
78% (32)
C
7% (3)
D
2% (1)

Explanation

When routers lose power and restart, dynamically learned routes (via OSPF, EIGRP, BGP, etc.) are cleared from the routing table and must be re-learned. If a router fails to re-establish those routes - or if static routes were never saved to non-volatile storage - connectivity to the remote office is lost. A bad cable would be unrelated to a power event; duplicate IP addresses and switching loops would also be unrelated to a power failure unless configuration was lost, and those scenarios would cause different, more localized symptoms.

Topics

#routing table#power failure recovery#missing route#remote office

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