多项选择题
A. Level 1 only routers see routes contained in their area.
B. Level 1 routers route towards Level 2 routers due to the attached bit.
C. Level 2 routers route towards Level 1 routers due to the attached bit.
D. Level 2 routers can see routes in other Level 2 areas and routes originated in Level 1 areas.
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?（）
多项选择题 Which two MBGP IPv4 sub-AFIs does the JUNOS software support?（）