单选题Which of the following functions does the "ifconfig en4 down" perform？（）A Removes the en4 interfaceB Removes the en4’s network routeC Stops all traffic through the en4 interfaceD Stops all traffic through the en4 and removes its network route from the

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单选题

Which of the following functions does the "ifconfig en4 down" perform？（）

Removes the en4 interface

Removes the en4’s network route

Stops all traffic through the en4 interface

Stops all traffic through the en4 and removes its network route from the routing table

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第1题：

According to STCW Code,which of the following functions must an engineer officer possess?( )

答案：

第2题：

When a teacher leads students to guess the meaning of a new word based on the contextual clue, which one of the following approaches does he use?

A.Bottom-up Approach.
B.Top-down Approach.
C.Interactive Approach.
D.3P Approach.

答案：B

解析：

考查阅读教学模式。
B选项，自上而下的模式(Top-down Approach) 是一个宏观的加工过程，通过背景、语境，符合题意，故此题的正确选项为B。
A选项，自下而上的模式(Bottom-up Approach)是一个解码的过程,从单词句子、整篇文章的理解。
C项，是交互式，结合A和B项；
D项，是presentation-practice-production模式；
故此题的正确选项为B。

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Which of the following utility functions reflects risk-aversion:

A uniform

B increasing

C decreasing

D exponential

E B and D only

正确答案：C

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Which two functions does Cisco Configuration Assistant provide？（）

A、 device Discovery
B、 call forwarding
C、 call routing configuration
D、 command line configuration
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正确答案:A,C

第5题：

Which of the following statements are true regarding Layer 3 switches？（Choose all that apply.）（）

A、A routed port does not run STP or DTP
B、A routed port is considered to be in a down state if it is not operational at both Layer 1 andLayer 2
C、An SVI is considered to be in a down state if it is not operational at both Layer 1 and Layer 2
D、An SVI is considered to be in a down state only when none of the ports in the correspondingVLAN are active
E、An SVI port does not run 5TP or DTP
F、To create a trunk， an SVI can be logically divided into subinterfaces

正确答案:A,B,D

第6题：

Allofthefollowingcommandscanbeusedtoplaceaninterfaceintothe"down"stateEXCEPT:()。

A.arp

B.smit

C.chdev

D.ifconfig

参考答案：A

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Which of the following commands should be used to determine DNS name resolution performance？（）

A、 iptrace
B、 vmstat
C、 hostname
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正确答案:A

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Which of the following word does not describe a color?

A、green

B、white

C、flower

D、orange

参考答案：C

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Which of the following are functions that are often provided by an ITSP but are not typically provided by the PSTN？（）

A、 QoS
B、 call setup and teardown
C、 call routing
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Which of the following does not affect security on a wireless access point?（）

A、Encryption
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C、Password
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正确答案:B

Which of the following functions does the "ifconfig en4 down

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