单选题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?（）Acomplete SNP (CSNP)Bpartial SNP (PSNP)ChelloDdatabase queryEdatabase description packet (DDP)
单选题
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)
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