单项选择题

Which mechanism accommodates the use of overlapping addresses in 2547bis VPNs?（）

A. policies
B. route origins
C. route targets
D. route distinguishers

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多项选择题

In which two ways can the router ID selection be controlled?（）

A. Manually assign rid.
B. configure local-address.
C. enable the fxp0 interface.
D. Assign nonmartian address to lo0.

单项选择题

Why does IS-IS use the SPF algorithm?（）

A. to determine the pseudonode ID
B. to determine the next hop to a given destination
C. to determine the complete path to a given destination
D. to determine the number of routers present in a given area