ALLAMA IQBAL OPEN UNIVERSITY, ISLAMABAD

(Department of Computer Science)

WARNING

1. PLAGIARISM OR HIRING OF GHOST WRITER(S) FOR SOLVING THE ASSIGNMENT(S) WILL DEBAR THE STUDENT FROM AWARD OF DEGREE/CERTIFICATE, IF FOUND AT ANY STAGE.
2. SUBMITTING ASSIGNMENT(S) BORROWED OR STOLEN FROM OTHER(S) AS ONE’S OWN WILL BE PENALIZED AS DEFINED IN “AIOU PLAGIARISM POLICY”.

Course: Computer Communications & Networks (3438)  Semester: Autumn 2020

Level: BS                                                                                        Total Marks: 100

Pass Marks: 50

ASSIGNMENT No. 1

(Units: 1–4)

Note: All questions are compulsory & carry equal marks.

1. 1 You have two computers connected by an Ethernet hub at home. Is this a LAN, a MAN, or a WAN? Explain your reason. (20)

1. 2 Suppose a computer sends a packet at the network layer to another computer somewhere in the Internet. The logical destination address of the packet is corrupted. What happens to the packet? How can the source computer be informed of the situation? (20)

1. 3 (a) What is the bandwidth of the composite signal shown in Figure.        (20)

         (b)     A signal travels from point A to point B. At point A, the signal power is 100 W. At point B, the power is 90 W. What is the attenuation in decibels?

1. 4 Define Transmission medium. What is the position of the transmission media in the OSI or the Internet model? Also illustrate different guided and unguided medium in detail. (20)

1. 5 (a) Compare and contrast PCM and DM.                                                  (20)

(b)     What are the differences between parallel and serial transmission?

(c)     In a digital transmission, the sender clock is 0.2 percent faster than the receiver clock. How many extra bits per second does the sender send if the data rate is 1 Mbps?

ASSIGNMENT No. 2

                                                                                                       Total Marks: 100

Pass Marks: 50

Note: All questions are compulsory & carry equal marks.

1. 1 What is the Hamming distance? What is the minimum Hamming distance? How is the simple parity check related to the two-dimensional parity check? (20)

1. 2 What is High Level Data Link Control (HDLC)? Also discuss framing in HDLC in detail. (20)

1. 3 Match the layers in Bluetooth and the Internet model. What are the two types of links between a Bluetooth primary and a Bluetooth secondary.? (20)

1. 4 What is the difference between connectionless and connection-oriented services? Which type of service is provided by IPv4? Which type of service is provided by IPv6? (20)

1. 5 Write short notes on the following: (20)

(a)     Standard Ethernet

            (b)     Unicast Routing Protocol

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