单项选择题
A. extending IPSec tunnels
B. carrying multiple address families
C. propagating DVMRP routing information
D. extending Autonomous System GRE tunnels
单项选择题 A BGP router is configured with bgp dampening 8 300 1500 20 route-map 1 .What does the value of 20 represent?（）
单项选择题 BGP route dampening is configured on a BGP router. Whose routing behavior is affected by this configuration?（）
单项选择题 What is the maximum suppress time for a dampened route, by default?（）