多项选择题

What are two advantages of BGP route aggregation?（） (Choose two.)

A. It can reduce routing table size.
B. It allows for optimal route selection.
C. It can reduce the number of routing updates.
D. It always shortens the attribute list for the aggregated route.

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单项选择题

On which destination port in the Layer 4 header does BGP listen?（）

A. UDP port 169
B. TCP port 169
C. UDP port 179
D. TCP port 179

单项选择题

Which CLI command displays the metrics associated with each advertised route?（）

A. show clns database
B. show isis database detail
C. show clns database detail
D. show isis database extensive

单项选择题

Which CLI command displays the IS-IS level used by each interface?（）

A. show clns neighbor
B. show isis neighbor
C. show clns interface
D. show isis interface