单项选择题
A. The update information will be added to the existing routing table.
B. The update information will replace the existing routing table entry.
C. The update will be ignored and thus no further action will occur.
D. The existing routing table entry will be purged from the routing table and all routers will attempt convergence.
单项选择题 The Testking network has been configured with OSPF as the routing protocol.What is the default administrative distance of the OSPF routing protocol?（）
单项选择题 A RIP router has an entry in the routing table for a specific network destination. It then gets updated with another entry for that same destination, but with a higher path cost (hop count) than the one already in the routing table. What will the router do in this situation?（）
单项选择题 The Testking network is utilizing RIP as the IP routing protocol. Router TK1 learns how to reach the same destination via 6 different paths. All paths have the same metric and administrative distance. With all routers using the default operation,which of the paths will be chosen to reach the destination?（）