I

UNIVERSITI TEKNOLOGI PETRONAS

FINAL EXAM JANUARY 2013 SEMESTER COURSE

EBB4O23

DATE

27rH

TIME

2.30 PM

- DATA AND COMPUTER NETWORK

APRIL 2013 (sATURDAv)

-

5.30 PM (3 HOURS)

INSTRUCTIONS TO CANDIDATES

Answer ALL questions from the Question Booklet. 2.

Begin EACH answers on a new page in the Answer Booklet.

3.

lndicate clearly answers that are cancelled, if any.

4.

Where applicable, show clearly steps taken in arriving at the solutions and indicate all assumptions.

5.

Do not open this Question Booklet until instructed.

Note

l

There are EIGHT (8) pages in this Question Booklet including the cover page.

Universiti Teknol-ogi

pETRoNAS

EBB 4023 1.

the maximum distance between locations of two antennas for line-of-sight (LOS) transmission if the transmitting Determine

a.

antenna is100 m above the ground level and the receiving antenna

is at 10 m above the ground level. Assume adjustment refraction factor,

K=

4/3.

[4 marks]

a

timing diagram to illustrate the physical layer representation of the signal transmission of character 'K' (B-bit Generate

b.

ASCII code'01 00101 1') using: Bipolar AMI encoding (Note: Most recent preceding 1 bit has negative voltage) and [2 marks]

ii.

Differential Manchester encoding (Note: Most recent preceding 1 bít has high to low transition) [2 marks]

c.

consider a point-to-point link 100 km in length. The propagation speed of this link is 2x108 m/s. Propose the data rate at which the propagation delay equals the transmission delay for packet.

a

1OO-byte

[3 marks]

d.

For each of the following pairs of networking terms, define each term, and indicate the key distinction between them: Baud rate and bit rate. [3 marks] il

Go-back-N and selective reject. [3 marks]

EBB 4023 d.

Consider the configuration

in

FIGURE

Q1

of the

Unshielded

Twisted Pair (UTP) cables A, B, C, D and E. Analyze and categorize each type of connection as either straight-through or crossover.

[3 marks]

FIGURE QI

3

EBB 4023 2.

Given

a.

a

channel with

a

bandwidth of 20

signal-to-noise ratio required

in dB to

MHz, evaluate the

achieve

a

capacity of

100 Mbps. Assume the noise is thermal. [4 marks]

b.

outline THREE (3) reasons wtry a large block of data must be broken up into a number of frames for data transmission. [3 marks]

c.

Propose the maximum link utilization for continuous flow control with a window size of 50 bits. The frame size is 2000 bits and it ís transmitted over 1-Mbps satellite channelwith 150 ms delay. [3 marks]

d.

A decimal number, 875, is to be transmitted as a binary number in a network from station A to station B. The pre-determined divisor

is 110101. The Cyclic Redundancy Check (CRC) scheme is used to detect if this message is accepted by both stations transm itted without error.

Generate the FCS and the message that should be transmitted from A to B by using modulo-2 arithmetic technique. [5 marks] il

Suppose that the seco;ld leftmost bit of the message is inverted due to noise in the transmission link. Propose a solution to this problem and justify your answer. [3 marks]

ilr

Outline how the CRC scheme helps to track errors

in

the data transmitted between a sender and a receiver. [2 marks] 4

EBB 4023

3.

a.

Analyze the advantages of having the Frame Check Sequence (FCS) field of lEEE802.3 frames in the trailer of the frame rather than in the header of the frame. [3 marks]

b.

Repeater, bridge and router are used to connect networks.

Differentiate

the operation of a repeater, bridge and

router. [6 marks]

Classify the layer related to the OSI seven layered model at

il

which each of the devices of part (bXi) operates. [3 marks]

iii.

By means of a protocol layer diagram, propose how an IEEE

802.3 LAN and IEEE 802.5 LAN can be interconnected by a router. [4 marks]

c.

A point-to-point satellite transmission link operating at a data rate of

I kbps uses a Stop-and-Wait ARQ error control technique. The link has a propagation delay of 20 ms and a total processing delay of 10

ms. Data is transmitted using a frame size of 896 bytes of which

868 bytes contain information. The acknowledgement contains

I

bytes. Determine the throughput of the link and evaluate the link performance. [4 marks]

5

EBB 4023

4.

a.

Justify why an application developer might choose to use UDP

instead of TCP as the transport layer protocol. [2 marks] b.

Discuss how the network layer ín

a

connection-oriented packet

switching network differs from the network layer in a connectionless packet-switch ing network. [4 marks] c.

Two different approaches for handling packets in packet-switching

networks are datagram and virtual circuits. Discuss how the operations of these two approaches differ. [4 marks] d.

FIGURE Q4 shows a network diagram. Apply Djikstra's algorithm

to find the shortest path from node y to all other network nodes. Assume costs are the same

for both directions of each link.

Construct a table to illustrate each step of the algorithm. [10 marks]

FIGURE Q4

6

EBB 4023 5.

a.

a company owns the block of addresses of the form 101.101.128117 and it needs to create subnets for the fìnance,

Suppose

human resource, procurement, and corporate departments from

this block, with each block having the same number of

lP

addresses. Design the prefixes for all the subnets. [5 marks]

b.

You are visiting a friend who lives on campus in

a

student

residence at another university. Using your friend's computer, you

type in ipconf ig command, which reveals the

following

configuration details: lP Address: 204.17.5.0 Cl

DR Mask: 255.255.255.224

Use this information to answer the following questions:

Determine the number of subnets configured for use. [2 marks]

ii.

Propose the maximum number of hosts possible for each subnet. [2 marks]

iii.

Construct the first TWO (2) subnet lDs and the respective host address range. [2 marks]

iv.

Select the híghest numbered legal lP address that can be used for the subnet and campus network as a whole. [2 marks]

7

EBB 4023

Suppose that the TCP entity receives a 4-Mbyte MP3 file from the

application layer and that the lP layer is willing to carry datagrams

with maximum size of 1500 bytes (including headers) between source Host A and destination Host B. Assume a 20-byte header for each TCP and lP

Generate the number

of

datagrams

required

to send the MP3 file. [3 marks]

il

Evaluate

the

percentage

of

overhead

incurred from

segmenting the file into packet-size units. [4 marks]

-END OF PAPER-

8

final exam january 2013 semester -

EBB4O23 - DATA AND COMPUTER NETWORK ... Analyze the advantages of having the Frame Check Sequence ... Using your friend's computer, you.

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