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Updated: Sep 07, 2025
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1. 私网设备 A 的 IP 地址是 192.168.1.1/24 ,其对应的公网 IP 是 2.2.2.1 ;
公网设备 B 的 IP 地址是 2.2.2.5 。现需要设备 A 对公网提供 Telnet 服务,可以在 NAT 设备上使用下列哪项配置 ?
A) nat server protocol tcp global 2.2.2.1 23 inside 192.168.1.1 23
B) nat server protocol tcp global 2.2.2.1 telnet inside 192.168.1.1
C) acl number 2000 rule 0 permit source 192.168.1.1 0.0.0.255 nat address-group 1 2.2.2.1 interface Ethernet 0/1 nat outbound 2000 address-group 1
D) nat server protocol telnet global 2.2.2.1 inside 192.168.1.1
E) acl number 2000 rule 0 permit source 192.168.1.1 0.0.0.255 nat address-group 1 2.2.2.1 interface Ethernet 0/1 nat outbound 2000 address-group 1 no-pat
2. 客户网络中仅有的两台路由器 MSR-1 、 MSR-2 之间的广域网链路采用 PPP 协议,两端通过配置 RIP 互相学习到彼此的路由,目前路由学习正常,现在在 MSR-1 的 RIP 配置中增加如下命令:
[MSR-1-rip-1] silent-interface all
那么 ______ 。(多选)
A) 配置此命令 10 分钟后, MSR-1 路由表中的 RIP 路由消失
B) 配置此命令 10 分钟后, MSR-2 路由表中的 RIP 路由消失
C) 此命令使 MSR-1 的所有接口只接收路由更新而不发送路由更新
D) 此命令使 MSR-1 的所有接口只发送路由更新而不接受路由更新
3. 下列关于以太网的说法正确的是 ________ 。(多选)
A) 以太网是基于共享介质的网络
B) 以太网传输距离短,最长传输距离为 500m
C) 以上说法均不正确
D) 以太网采用 CSMA/CD 机制
4. 以下说法正确的是 ______ 。(多选)
A) CSU ( Channel Service Unit ,信道服务单元):把终端用户和本地数字电话环路相连的数字接口设备。通常它和 DSU 统称为 CSU/DSU 。 CSU 设备包括计算机、协议翻译器以及多路分解器等设备。 DTE 设备包括这些
B) DTE ( Data Terminal Equipment ,数据终端设备)设备指位于用户网络接口用户端的设备,它能够作为信源、信宿或同时为二者。数据终端设备通过数据通信设备(例如,调制解调器)连接到一个数据网络上,并且通常使用数据通信设备产生的时钟信号。调制解调器和接口卡都是 DTE 设备的例子。是 DCE 设备的例子
C) DCE ( Data Circuit Terminating Equipment ,数据通信设备或者数据电路终端设备)设备及其与通信网络的连接构成了网络终端的用户网络接口。它提供了到网络的一条物理连接用于转发业务量,并且提供了一个用于同步 DCE 设备和 DTE 设备之间数据传输的时钟信号。
D) DSU ( Data Service Unit ,数据服务单元):指的是用于数字传输中的一种设备,它能够把 DTE 设备上的物理层接口适配到 T1 或者 E1 等通信设施上。数据业务单元也负责信号计时等功能,它通常与 CSU 一起提及,称作 CSU/DSU 。
5. 如果全 0 和全 1 子网可以作为有效子网, C 类地址 192.168.1.0 用 26 位的子网掩码进行子网划分,可以划分的有效子网个数为 ______ 。
A) 4
B) 2
C) 8
D) 6
Solutions:
Question # 1 Answer: A | Question # 2 Answer: B,C | Question # 3 Answer: A,D | Question # 4 Answer: C,D | Question # 5 Answer: A |
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