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چهارشنبه 21 فروردین 1387

تستهای فصل سوم

نویسنده: علی سلیمی   طبقه بندی: تستهای CCNA، 

برگزیده ای از تستهای فصل سوم در این بخش آمده است. برای مشاهده تستها روی ادامه مطلب کلیک کنید.

1) Which of the following best describes the main function of OSI Layer 1 protocols?

A. Framing

B. Delivery of bits from one device to another

C. Addressing

D. Local Management Interface (LMI)

E. DLCI

2) Which of the following typicall connects to a four-wire line provided by a telco?

A. Router serial interface

B. CSU/DSU

C. Transceiver

D. Switch serial interface

3) Which of the following typically connects to a V.35 or RS-232 end of a cable when cabling a leased line?

A. Router Sserial interface

B. CSU/DSU

C. Transceiver

D. Switch serial interface

4) Which of the following functions of OSI Layer 2 is specified by the protocol standard for PPP , but is implemented with a Cisco proprietary header field for HDLC?

A. Framing

B. Arbitration

C. Addressing

D. Error detection

E. Identifying the type of protocol that is inside the frame

5) Which of the following WAN data link protocols on Cisco routers support multiple Layer 3 protocols by virtue of having some form of Protocol Type field? (Choose Three)

A. PPP

B. HDLC

C. LAPB

D. LAPD

E. SDLC

6) On a point-to-point WAN link between two routers , what device(s) are considered to be the DTE devices?

A. The routers

B. The CSU/DSUs

C. The central office equipment

D. A chip on the processor of each router

E. None of the above

7) Imagine that Router1 has three point-to-point serial links, one link each to three remote routers. Which of the following is true about the required HDLC addressing at Router1?

A. Router1 must use HDLC addresses 1,2 and 3.

B. Router1 must use any three unique addresses between 1 and 1023.

C. Router1 must use any three unique addresses between 16 and 1000.

D. Router1 must use three sequential unique addresse between 1 and 1023.

E. None of the abovE.

8) What is the name of the Frame Relay field used to identify Frame Relay Virtual Circuits?

A. Data-link connection identifier

B. Data-link circuit identifier

C. Data-link connection indicator

D. Data-link circuit indicator

E. None of the above

9) Which of the following is true about Frame Relay virtual circuits?

A. Each VC requires a separate access link.

B. Multiple VCs can share the same access link.

C. All VCs sharing the same access link must connect to the same router on the other side of the VC.

D. All VCs on the same access link must use the same DLCI.

10) Which of the following defines a SONET link speed around 155 Mbps?

A. T1

B. T3

C. DS3

D. DS155

E. OC-3

F. OC-12

G. OC-48

H. OC-155

1) B

2) B

3) B

4) E

5) A,B,C

6) A

7) E

8) A

9) A

10) E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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