单项选择题
A. set protocols bgp group mygroup path-selection cisco-non-deterministic;
B. set protocols bgp group i-bgp no-aggregator-id;
C. set protocols bgp group mygroup no-client-reflect;
D. set protocols bgp group i-bgp damping;
多项选择题 Which two statements are true by default of a multilevel IS-IS network?（）
单项选择题 In IS-IS, how long will the restart helper keep the restarting router in the up state?（）
单项选择题 A router receives an IPv6 packet which is 2000 bytes in length. The MTU of the outgoing interface is 1500 bytes. Which action will the router take?（）