Data and Computer Networking

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UNIVERSITI MALAYSIA SARAWAK

94300 KOTA SAMARAHAN

SARAWAK

FAKULTI SAINS KOMPUTER & TEKNOLOGI MAKLUMAT

(Facul ty of Computer Science & I nformation Technology)

Diploma in Multimedia Technology

FOURTH, FIFTH SEMESTERFINAL EXAMINATION, 2013/2014 SESSION

ITC2043 DATA AND COMPUTER NETWORKING

DMTW-E-F-1/12, DMTW-E-F-2/12

18 FEBRUARY 2014

9.00 AM 11.00 AM(2 Hours)

INSTRUCTION TO STUDENT

1. This Examination paper has TEN (10)printed pages.

2. This question paper consists of TWO (2)sections.

Section A : Answer ALLquestions.

Section B : Answer SIX (6) questions ONLY.

3. Please write all your answers in the Answer Booklet provided.

STUDENT IDENTIFICATION NO


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ITC2043 DATA AND COMPUTER NETWORKING 18 FEBRUARY 2014

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SECTION A : OBJECTIVE QUESTIONS- (40 marks)

INSTRUCTION : ANSWER ALL QUESTIONS

1. A local area network (LAN) is defined by _______________ .

A.

the geometric size of the network

B. the maximum number of hosts in the network

C. the maximum number of hosts in the network and/or the geometric size of

the network

D. the topology of the network

2. The TCP/IP protocol suite consists of _______ layers.

A. two

B.

three

C. five

D. six

3. In a frequency-domain plot, the horizontal axis measures the ________.

A.

signal amplitude

B. frequency

C.phase

D.

time

4. Polar and bipolar encoding are types of _______ coding.

A. line

B.block

C. scrambling

D.None of the choices are correct

Continued


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5. ASK, PSK, FSK, and QAM are examples of ________ conversion.

A.

digital-to-digital

B. digital-to-analog

C. analog-to-analog

D.

analog-to-digital

6. Which multiplexing technique is used for analog signals?

A. FDM

B. TDM

C.

WDM

D. PDM

7. Transmission media are usually categorized as _______.

A. fixed or unfixed

B. guided or unguided

C.

determinate or indeterminate

D. metallic or nonmetallic

8. Circuit switching can be divided into ________ categories.

A.

two

B. three

C.

four


Continued


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9. Communication at the data-link layer is ___________________.

A.

end-to-end

B. node-to-node

C.process-to-process

D.

None of the choices are correct

10. Which of the following best describes a single-bit error?

A. A single bit is inverted

B. A single bit per transmission is inverted

C.

A single bit per data unit is inverted

D. All of the choices are correct

11. HDLC is an acronym for _______.

A. High-Duplex Line Communication

B. Half-Duplex Link Combination

C.

High-Level Data Link Control

D. Host Double-Level Circuit

12. In the _______ random-access method collision is avoided.

A.

CSMA/CD

B. CSMA/CA

C.

ALOHA

D. token-passing

Continued


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13. Given the Ethernet address 01011010 00010001 01010101 00011000

10101010 00001111 in binary, what is the address in hexadecimal notation?

A. 5A:88:AA:18:55:F0

B. 5A:81:BA:81:AA:0F

C.

5A:18:5A:18:55:0F

D. 5A:11:55:18:AA:0F

14. The largest portion of the bandwidth for ADSL carries _______.

A. voice communication

B.

upstream data

C. downstream data

D. control data

15. Which of the following statements about wired and wireless LANs is correct?

A. Both operate in the lower two layers of the TCP/IP protocol suite.

B.

Wired LANs operate in the lower two layers and wireless LANs operate in

the lower three layers of the TCP/IP protocol suite.

C.

Wired LANs operate in the lower three layers and wireless LANs operate

in the lower two layers of the TCP/IP protocol suite.

D. Both operate in the lower three layers of the TCP/IP protocol suite.

16. _______ is a first-generation cellular phone system.

A. AMPS

B. D-AMPS

C. GSM


Continued


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17. A VLAN is a local area network configured by_____________.

A.

software

B.physical wiring

C. software or physical wiring

D.

None of the choices are correct

18. Packetizing at the network layer involves ___________________________.

A. encapsulating the payload at the source

B. adds a header that contains the source and destination information

C.

decapsulating the payload at the destination

D. All of the choices are correct

19. IP is a _________ protocol.

A. connection-oriented unreliable

B. connection-oriented reliable

C.

connectionless unreliable

D. connectionless reliable

20. Routing inside an autonomous system is referred to as ________ routing.

A.

interdomain

B. intradomain

C.

out-of-domain


Continued


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SECTION B : LONG QUESTIONS - (60 Marks)

INSTRUCTION : ANSWER SIX (6) QUESTIONS ONLY

Question 1

a)

For each of the following networks, discuss the consequences if a connection

fails.

i. Devices arranged in a mesh topology

ii.

Devices arranged in a star topology (not counting the hub)

iii. Devices arranged in a bus topology

iv.

Devices arranged in a ring topology

(5 Marks)

b) Match the following to one or more layers of the TCP/IP protocol suite:

i.

route determination

ii. connection to transmission media

iii.

providing services for the end user

(5 Marks)

Question 2

a) Answer the questions below

i. What does the amplitude of a signal measure?

ii.

What does the frequency of a signal measure?

iii. What does the phase of a signal measure?

(5 Marks)

b)

List three different techniques in serial transmission and explain the differences.

(5 Marks)

Continued


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Question 3

a) Define constellation diagram and explain its role in analog transmission.

(5 Marks)

b) Define spread spectrum and its goal. List the two spread spectrum techniques

that you know.

(5 Marks)

Question 4

a) Answer the questions below

i.

What is refraction?

ii. What is reflection?

(5 Marks)

b) List the three traditional switching methods. Which are the most common today?

(5 Marks)

Question 5

a)

When we send a letter using the services provided by the post office, do we use

an end-to-end address? Does the post office necessarily use an end-to-end

address to deliver the mail? Explain.

(5 Marks)

b)

In a codeword, we add two redundant bits to each 8-bit data word. Find the

number of

i.

valid codewords

ii. invalid codewords

(5 Marks)

Continued


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Question 6

a)

Compare and contrast byte-oriented and bit-oriented protocols.

(5 Marks)

b)

List some strategies in CSMA/CA that are used to avoid collision.

(5 Marks)

Question 7

a)

What is the difference between unicast, multicast and broadcast addresses?

(5 Marks)

b) What type of topology is used when customers in an area use DSL modems for

data transfer purposes? Explain.

(5 Marks)

Question 8

a)

What is multipath propagation? What is its effect on wireless networks?

(5 Marks)

b) To which generation does each of the following cellular telephony systems

belong?

i. AMPS

ii.

D-AMPS

iii. IS-95

(5 Marks)

Continued


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Question 9

a)

A switch uses a filtering table; a router uses a routing table. Can you explain the

difference?

(5 Marks)

b) What is the piece of information in a packet upon which the forwarding decision

is made in each of the following approaches to switching?

i. datagram approach

ii. virtual-circuit approach

(5 Marks)

End of Page.

Data and Computer Networking

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