The Ezonexam network administrator has just issued the "swit

【名词&注释】

可扩展性(scalability)、优先级(priority)、以太网(ethernet)、模块化路由器(module router)、优先选择(priority selection)

[单选题]The Ezonexam network administrator has just issued the "switchport trunk native vlan 998" command on switch VE2. What is the function of this command?

A. It designates VLAN 998 as the default for all unknown tagged traffic
B. It designates VLAN 998 for untagged traffic
C. It blocks VLAN 998 traffic from passing on the trunk
D. It creates a VLAN 998 interface
E. None of the above

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学习资料：

[单选题]关于OSPF中DR的说法不正确的是（）

A. 通过hello报文选举DR
B. 如果某路由器优先级比DR优先级高，但启动晚，它会抢占原来的DR自己成为DR
C. 一个广播类型网络中只能有一个DR
D. 一旦DR失效，BDR接替DR的工作，并重新选举一个BDR

[单选题]如果网络中的路由器都是cisco路由器，则优先选择^{(priority selection)}哪一个路由协议（）

A. RIP
B. EIGRP
C. IGRP
D. OSPF

[单选题]路由器上激活端口的命令是（）

A. shutdown
B. no shutdown
C. up
D. noup

[单选题]下面对Cisco2621路由器和Cisco2501路由器描述中，错误的是（）

A. Cisco2621路由器的可扩展性优于Cisco2501路由器
B. Cisco2621是模块化路由器
C. Cisco2501上提供一个100Mbit/s的快速以太网端口
D. Cisco2501是固定端口的路由器

[多选题]Regarding the extended ping command; which of the statements below are true?(Select all valid answer choices)

A. The extended ping command is supported from user EXEC mode.
B. The extended ping command is available from privileged EXEC mode.
C. With the extended ping command you can specify the TCP and UDP port to be pinged.
D. With the extended ping command you can specify the timeout value.
E. With the extended ping command you can specify the datagram size.

[单选题]Which type of cable should be used to make a connection between the Fa0/0 port on a router and the Fa0/0 port switch?

A. Rollover cable
B. Console cable
C. Crossover cable
D. Straight-through cable
E. Serial cable

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