单选题What is periodically sent by a DIS on a LAN to ensure that all adjacent neighbors' IS - IS link - state databases are synchronized?（）Acomplete SNP (CSNP)Bpartial SNP (PSNP)Cdatabase queryDdatabase description packet (DDP)Elink - state summaryFhello
单选题
What is periodically sent by a DIS on a LAN to ensure that all adjacent neighbors' IS - IS link - state databases are synchronized?（）
A
complete SNP (CSNP)
B
partial SNP (PSNP)
C
database query
D
database description packet (DDP)
E
link - state summary
F
hello
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