packet包

[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

[单选题]防火墙大体可分为两类，基于包过滤(Packet Filter)和( )。A．基于TCP/IP协议B．基于代理服务(Proxy Service)C．基于特定病毒D．基于特定服务

[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

[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] When a large packet wants to travel through a network whose MTU is too small, one solution is to allow routers to break up the packet into （）. （）A. messages B. frames C. fragments D. bits

[单选题]LSAck报文（Link State Acknowledgment Packet）是对哪些OSPF报文的确认。（）A . HELLOB . DDC . LSRD . LSUE . LSAck

[判断题] 根据OSI七层模型，一个数据包的封装过程为bit―frame－packet―data－segment。A . 正确B . 错误

[单选题]GPRS——General Packet Radio Service，即通用分组交换无线数据业务，又称（）。A . 2GB . 2.5GC . 3GD . 4G

[填空题] GPRS（General Packet Radio Service，通用分组无线业务）是在现有的GSM移动通信系统基础上发展起来的一种移动（）业务。