多项选择题
A. They establish routes that will never go down.
B. The keep routing tables small.
C. They require a great deal of CPU power.
D. The allow connectivity to remote networks that are not in the routing table.
E. They direct traffic from the Internet into corporate networks.
单项选择题 How does route poisoning work with holddown timers to prevent routing loops?（）
单项选择题 What does a router do if it has no EIGRP feasible successor route to a destination network and the successor route to that destination network is inactive status?（）
多项选择题 Which of the following describe the process identifier that is used to run OSPF on a router?（）