多项选择题
A. Log packets.
B. Set packet metrics.
C. Count packets.
D. Decrement packet's TTL value.
单项选择题 What is the function of the helper router during a restart event in OSPF?（）
单项选择题 In JUNOS software, which would prevent an OSPF router from importing the 10.0.0.4/30 summaryroute?（）
单项选择题 A successful authentication attempt by a RADIUS server does not supply a username to the JUNOSsoftware. Which username is used by default?（）