Which fields are included in the TCP header? (Choose three).

A. Source Port

B. Acknowledgement Number

C. Request Number

D. Destination Address

E. Window

F. Data

路由器上，清空路由表的命令是（）

A.clear ip

B.delete ip route

C.delete route

D.clearip route*

What will a new Ezonexam router do during startup if a configuration file is not located in NVRAM?

A．It will search for the configuration file in the locations specified by boot system commands.

B．It will search for the configuration file in flash and if no configuration file is found there, it will enter the setup dialog.

C．It will search for the configuration file on a TFTP server and if no configuration file is found there, it will enter the setup dialog.

D．It will search for the configuration file in flash and if no configuration file is found there, it will load a limited configuration file from ROM.

E．It will search for the configuration file on a TFTP server and if no configuration file is found there, it will load a limited configuration file from ROM.

TELNET工作在OSI哪一层（）

A.会话层

B.表示层

C.传输层

D.应用层

下面哪些不是RIP-V1版本所携带的信息（）。

A.版本

B.IP地址

C.子网掩码

D.度量值

You need to perform. some initial configuration tasks on a new Ezonexam switch. What is the purpose of assigning an IP address to a switch?

A．To provide local hosts with a default gateway address

B．To allow remote management of the switch.

C．To allow the switch to respond to ARP requests between two hosts

D．To ensure that hosts on the same LAN can communicate with each other.

E．None of the above

The Ezonexam network administrator has issued the "VTP password ezonexam" command on a Cisco device. What is the purpose of this command?

A．It allows two VTP servers to exists in the same domain, each configured with different passwords

B．It is the password required when promoting a switch from VTP client mode to VTP server mode

C．It is used to access the VTP server to make changes to the VTP configuration

D．It is used to validate the sources of VTP advertisements sent between switches

E．None of the above

对于以下关于OSPFNSSA区域描述正确的是()

A.NSSA区域会自动下发一条七类的缺省路由

B.完全NSSA区域会自动下发一条三类的缺省路由

C.NSSA区域中不能包含ASBR路由器

D.NSSA区域一般会部署在区域0E配置NSSA区域必须在该区域所有路由器上设置

路由器上，命令“show int s0”的显示结果为：Serial0 is up,line protocol is down出现该结果的可能原因是（）

A.端口处于关闭状态

B.物理端口被烧毁

C.两端设备协议不一致

D.路由表中无路由

Assuming you build networks to exact specifications, what is the recommended maximum length a 10BaseT cable can be before it has to be segmented or repeated?

A．100 meters

B．100 feet

C．100 yards

D．200 meters

E．None of the above

支持可变长子网掩码的路由协议有()

A.RIPv1

B.RIPv2

C.OSPF

D.IS-IS