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)
正确答案:B
答案解析:有
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