单项选择题
Which packet type is used to ackno wledge LSPs on point - to - point links and to request missing pieces of information in the IS - IS link -state database?（）
A. complete SNP (CSNP) B. partial SNP (PSNP) C. hello D. database query E. database description packet (DDP)
单项选择题 What is periodically sent by a DIS on a LAN to ensure that all adjacent neighbors' IS - IS link - state databases are synchronized?（）
单项选择题 What are the basic configuration steps to enable IS - IS?（）
单项选择题 In reference to the P1R3 show isis route output, which statement is true? （）
