单项选择题
A. Information learned from one source is not distributed back to that source.
B. Routing updates from the poisoned source are ignored until a holddown timer expires.
C. Failed routes are advertised with infinite metrics.
D. New routing updates are ignored until the network has converged.
E. A route is marked as unavailable when its time-to-live is exceeded.
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?（）
单项选择题 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?（）