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What is the difference between a

题目

What is the difference between a CSU/DSU and a modem?（）

  • A、A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line
  • B、A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line
  • C、A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line
  • D、A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line
参考答案和解析
正确答案:D
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相似问题和答案

第1题：

What’s the difference between an interface and abstract class?

(接口与抽象类有什么区别)


正确答案：
 

第2题：

The height of tide is the ______.

A.depth of water at a specific time due to tidal effect

B.difference between the depth of the water and the area's tidal datum

C.difference between the depth of the water and the high water tidal level

D.difference between the depth of the water at high tide and the depth of the water at low tide


正确答案：B

第3题：

What is the main difference between the two parts of the city?.

A. The colour of the buildings.

B. The age of the buildings.

C. The colour of the roofs.

D. The length of the streets.


正确答案：B
37．答案为B  此题为推断题。文中第三段指出瓦伦西亚市的新旧两部分的差异，但是没有直接对比建筑的颜色、屋顶的颜色和街道的长度，故选B。

第4题：

What does the command show | compare rollback 1 display?（）

  • A、the difference between the current candidate configuration and the candidate configuration from one commit ago
  • B、the difference etween the current active configuration and the active configuration from the one commit ago
  • C、the difference between the current active configuration and the active configuration from one commit ago
  • D、the difference between the current candidate configuration and the archived configuration from one commit ago

正确答案:D

第5题：

Which of the following may illustrate the difference between "competence" and__________ "performance"?

A．What a person "knows" and what he/she "does".
B．What a person "can do" and what he/she "does".
C．What a person "does" and what he/she "knows".
D．What a person "does" and what he/she "can do".

答案：A
解析：
考查语言学知识。competence“语言能力”，指语言使用者对于语言规则系统的潜在意识；performance“语言运用”，指在具体场景中语言的实际运用，二者对应的分别为“knows”和“does”。故选A。

第6题：

Q2 : Declare Function Multiply_Add Lib “test” (ByRef A as i as integer ) as integer

Q2.1: Explain what is Declare Function used for ?

Ans :

Q2.2 : Explain the difference between ByRef and ByVal ?

Ans :


正确答案：
 

第7题：

What is the difference between net tonnage and gross tonnage ________．

A.Net tonnage is the gross tonnage less certain deductions for machinery and other areas

B.Net tonnage is tonnage of cargo compared to tonnage of whole ship

C.Net tonnage is the net weight of the ship

D.There is no difference


正确答案：A

第8题：

The real difference between plants and animals ____ what they do, and not in what they seem to be.

A: lies in

B: lies with

C: lies down

D: lies up


参考答案：A

第9题：

what is the difference between the HSRP and VRRP？


正确答案: （1）VRRP is an IEEE standard （RFC 2338） for router redundancy； HSRP is a Cisco proprietary protocol.
（2）VRRP allows actual router IP address to be the same with the virtual IP，and if the same the router which get the IP will become Master router of the VRRP group；HSRP do not allow actual router IP address to be the same with the virtual IP.
（3）HSRP uses the multicast address 224.0.0.2 which represent all router in the subnet ， while VRRP uses the multicast address 224.0.0.18；HSRP uses UDP port 1985 while VRRP uses a protocol number of 112.
（4）HSRP may have one active router，one standby router，multiple listening router.While VRRP may have one master router，multiple backup router.
（5）HSRP exchange three kinds of message， hello message，coup message ，resign message. VRRP exchange only one kind of message， advertisement message.
（6）In VRRP，preempt is enable by default.But in HSRP preemt is disable by default.

第10题：

What is the difference between the transmitted power and the sensitivity of the receiver？ （）

  • A、 OSNR
  • B、 dispersion
  • C、 attenuation
  • D、 power budget
  • E、 amplifier spacing
  • F、 four wave mixing

正确答案:D

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