LSAck报文（Link State Acknowledgment Packet）是对哪些OSPF报文的确认。（）

[名词解释] link－state连接状态

[单选题]哪个IS-IS邻居状态显示双向通信已经发生但link-state数据库仍在收敛？（）。A . NewB . One-WayC . InitializingD . Up

[多选题] 在OSPF中，Link State ID是LSA所描述的那部分链路的标识，下列对于不同类型LSA的Link State ID描述正确的是（）。A . Router LSA的Link State ID是该路由器所连接的网段B . Network LSA的Link State ID是所描述网段上DR的端口IP地址C . Network Summary LSA的Link State ID是所描述的目的网段地址D . ASExternal LSA的Link State ID是所描述的ASBR的Rout

[单选题]Packet Uplink Ack/Nack，Packet Downlink Ack/Nack属于那一层的信令：（）A . Layer3三层信令B . RLC/MAC层信令C . LLC层信令D . SNDCP层信令

[填空题] OSPF路由协议是一种典型的链路状态（Link-state）路由协议，一般用于同一个（）内。

[名词解释] packet包

[单选题]Packet switching is a method of slicing(71) messages into parcels called "packets," sending the packets along different communication(72) as they become available, and then reassembling the packets(73) they arrive at their destination. Prior to the

[单选题]Packet-switching wireless networks are preferable(66)when transmissions are(67)bemuse of the way charges are(68)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are

[单选题]Packet-switching wireless networks are preferable(41)when transmissions are(42)because of the way charges are(43)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers ar

[名词解释] delirium state