单项选择题
A. Only routers can split boundaries (horizons) between networks in separate AS numbers.
B. Each AS must keep routing tables converged to prevent dead routes from being advertised across boundaries.
C. Once a route is received on an interface, advertise that route as unreachable back out the same interface.
D. Information about a route should never be sent back in the direction from which the original update came.
多项选择题 Which of the following routing protocols are less likely prone routing loops and network reachability problems when used in discontiguous networks?（）
多项选择题 Which of the following OSPF commands, when used together, will put the network 192.168.10.0/24 into OSPF area 0?（）
单项选择题 What is the reason for configuring a passive interface on a router?（）