题目内容
（请给出正确答案）
网络地址和端口翻译（NAPT）用于 （19） ，
A.把内部的大地址空间映射到外部的小地址空间
B.把外部的大地址空间映射到内部的小地址空间
C.把内部的所有地址映射到一个外部地址
D.把外部的所有地址映射到一个内部地址
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
更多“网络地址和端口翻译（NAPT）用于 （19） ，A.把内部的大地址空间映射到外部的小地址空间B.把”相关的问题
A、静态NAT、动态NAT和混合NAT
B、静态NAT、网络地址端口转换PAT和混合NAT
C、静态NAT、动态NAT和网络地址端口转换PAT
D、动态NAT、网络地址端口PAT和混合NAT
A.Hello
B.Keepalive
C.SPF
D.LSU@@@SXB@@@A．每一个路由器都包含了拓扑数据库的所有选项
B．在同一区域中的所有路由器包含同样的拓扑数据库
C．使用Dijkstra算法来生成拓扑数据库
D．使用LSA分组来更新和维护拓扑数据库
A.钓鱼网站仿冒真实网站的URL地址
B.钓鱼网站是一种网络游戏
C.钓鱼网站用于窃取访问者的机密信息
D.钓鱼网站可以通过Email传播网址
A.网络地址
B.组播地址
C.主机地址
D.定向广播地址@@@SXB@@@A.网络地址
B.组播地址
C.主机地址
D.定向广播地址
The TCP protocolis a (71) 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 (72) 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 (73) 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 (74)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(75) by basing it on the round-trip time (RTT). Several formulas are used for this purpose.
A.physical
B.network
C.transport
D.application@@@SXB@@@A.path
B.window
C.response
D.process@@@SXB@@@A.process
B.segment
C.program
D.user@@@SXB@@@A.connections
B.requests
C.acknowledgments
D.datagrams@@@SXB@@@A.long
B.short
C.fixed
D.dynamic
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