试题1

以太网中的帧属于 （ ） 协议数据单元。
A、物理层
B、数据链路层
C、网络层
D、应用层

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试题2

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试题3

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试题4

依据我国著作权法的规定，  （ ）  属于著作人身权。
A、发行权
B、复制权
C、署名权
D、信息网络传播权

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试题5

在Kerberor认证系统中，用户首先向  (1)  申请初始票据，然后从  (2)  获得会话密钥。
（1）A、域名服务器DNS
B、认证服务器AS
C、票据授予服务器TGS
D、认证中心CA
（2）A、域名服务器DNS
B、认证服务器AS
C、票据授予服务器TGS
D、认证中心CA

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试题6

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试题7

The TCP protocolis a (1) layer protocol. Each connection connects two TCPs that may be just one physical network apart or located on opposite sides ofthe globe. In other words, each connection creates a (2) witha length that may be totally different from another path created by another connection. This means that TCP cannot use the same retransmission time for all connections. Selecting afixed retransnussion time for all connections can result in serious consequences. Ifthe retransmission time does not allow enough time for a (3) to reach the destination and an acknowledgment to reach the source, it can result in retransmission of segments that are still on the way. Conversely, if the retransnussion time is longer than necessary for a short path, it may result in delay for the application programs.Even for one single connection, the retransmission time should not be fixed.A connection may be able to send segments and receive (4)faster during nontraffic period than during congested periods. TCP uses the dynamic retransmission time,a transmission time is different for each connection and which may be changed during the same connection. Retransmission time can be made(5)  by basing it on the round-trip time (RTT). Several formulas are used for this purpose.
（1）A、physical
B、network
C、transport
D、application
（2）A、path
B、window
C、response
D、process
（3）A、process
B、segment
C、program
D、user
（4）A、connections
B、requests
C、acknowledgments
D、datagrams
（5）A、long
B、short
C、fixed
D、dynamic

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试题8

下面病毒中，属于蠕虫病毒的是  (   。
A、Wom.Sasser病毒
B、Trojan.QQPSW病毒
C、Backdoor.IRCBot病毒
D、Macro.Melissa病毒

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试题9

我国著作权法中， （ ） 系指同一概念。
A、出版权与版权
B、著作权与版权
C、作者权与专有权
D、发行权与版权

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试题10

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