【单选题】A router has EIGRP configured as the only routing protocol. How does EIGRP respond if there is no feasible successor route to a destination network and the successor route fails?()
A.
It immediately sends its entire routing table to its neighbors.
B.
EIGRP sends a Hello packet to the DR to inform it of the route failure.
C.
It automatically forwards traffic to a fallback default route until a successor route is found.
D.
It sends queries out to neighbors until a new successor route is found.
E.
It places the route in holddown until LSA updates inform it of a new route to the network.
【单选题】A technician needs to add network capacity. However, when plugging a second switch into the first switch, there is no link light. Which of the following is the cause of this situation?()
【单选题】I live in a faraway village. There is no wireless network or telephone signals. I am a farmer. I work hard, but I only get 2000 dollars a year. If I want to contact my friends in Shanghai, I will ____...