单项选择题

What is the purpose of IS-IS level boundaries?（）

A. Restrain the formation of adjacencies.
B. Control the flooding scope of link-state PDUs.
C. Partition the L2 backbone into multiple domains.
D. Aggregate L1 domains into a contiguous backbone.

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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

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