After updating serverB‘s network configurations, anadministrator notices that serverA, which resides in a different subnet, is unable to communicate with serverB via ssh or telnet. As ping‘s to the server fail, the administrator logs onto serverB via a co
题目
After updating serverB‘s network configurations, anadministrator notices that serverA, which resides in a different subnet, is unable to communicate with serverB via ssh or telnet. As ping‘s to the server fail, the administrator logs onto serverB via a console and finds an available interface en0 in the ‘up‘ state. From the console connection, en0 can communicate with other servers in the same subnet.What is the most likely cause of the problem?（）
A.en0 has no associated ip address.
B.serverB is missing its default route.
C.serverB and serverA cannot connect due to a firewall.
D.en0 has been set up to block traffic from servers that are in different subnets.
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第1题：
路由器R1的连接和地址分配如下图所示，如果在Rl上安装OSPF协议，运行下列命令：router ospf 100，则配置s0和E0端口的命令是——。
A．network 192．100．10．4 0．0．0．3 area 0 network 192．1．0．128 0．0．0．63 area 1
B．network 192．100．10．5 0．0．0．3 area0 network 192．1．0．129 0．0．0．63 area l
C．network 192．100．10．5 255．255．255．252 area0 nework 192．1．0．129 255．255．255．192 area l
D．network 192．100．10．4 255．255．255．252 area0 network 192．1．0．128 255．255．255．192 area 1
正确答案：A
解析：配置动态OSPF路由的命令格式如下：net-work 192.168.0.0 O.O.0.255 area 0，其中192.168.0.0是子网的地址，也可以是路由器上接口的IP地址或OSPF路由器所用接口的网络地址；而O.0.0.255是子网掩码的反码。由图可知S0和EO的子网地址分别为192.100.10.4和192.1.0.128。它们的子网掩码的反码分别是0.0.0.3和0.0.0.63，故选A)。 -
第2题：
To access information on the Intemet，a user must first log on to the client computer'S______network．
A．server
B．client
C．host
D．self
正确答案：C
解析：为了能够访问因特网上的信息，用户必须首先登录到客户机的主机网络上。 -
第3题：
单词foo（t)ball可以读成fooball，短语whi（t)e paper可以读作why paper。
n.足球比赛；足球 -
第4题：
下列程序段执行后，内存变量 s1 的值是
s1= " network "
s1=stuff(s1,4,4, " BIOS " )
?s1
A) network
B) netBIOS
C)net
D) BIOS
正确答案：B
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第5题：
Secure Shell (SSH) is a cryptographic network protocol for （ ） remote login and other secure network services over an（ ）network.The standard（ ）port for SSH is 22. The best known example application is for remote login to computer systems by users.
SSH provides a secure channel over an insecured network in a（请作答此空） architecture, connecting an SSH client application with an SSH server. Common applications include remote command-line login and remote command execution, but any network service can be secured with SSH. The protocol specification distinguishes between two major versions, referred to as SSH-1 and SSH-2.
The most visible application of the protocol is for access to shell accounts on（ ）operating systems, but it sees some limited use on Windows as well. In 2015, Microsoft announced that they would include native support for SSH in a future release.A.client-server
B.browser-server
C.connectionless
D.P2P答案：A解析：Secure Shell (SSH) is a cryptographic network protocol for secure remote login and other secure network services over an insecure network.The standard TCP port for SSH is 22. The best known example application is for remote login to computer systems by users.
SSH provides a secure channel over an insecured network in a client-server architecture, connecting an SSH client application with an SSH server. Common applications include remote command-line login and remote command execution, but any network service can be secured with SSH. The protocol specification distinguishes between two major versions, referred to as SSH-1 and SSH-2.
The most visible application of the protocol is for access to shell accounts on Unix-like operating systems, but it sees some limited use on Windows as well. In 2015, Microsoft announced that they would include native support for SSH in a future release. -
第6题：
4、单词foo（t)ball可以读成fooball，短语whi（t)e paper可以读作why paper。
D