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University of Barishal

Department of Computer Science and Engineering

2nd Mid Exam

Course Title: Computer Networks (CSE-3105)

Semester: 5th | Session: 17-18

Time: 60 minutes | Marks: 20.00

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1.

1)

What is indirect packet delivery? Discuss about network specific and host specific packet forwarding techniques.

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3 Marks
2)

Draw the IP datagram format and describe the IP protocol version number and length field.

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3 Marks
3)

What are the differences between message confidentiality and message integrity? Can you have one without another?

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3 Marks
4)

Why fragmentation is needed in IPv4? In an IPv4 packet, the value of HLEN is 5, and the value of total length field is 0X0028. How many bytes of data are being carried by this packet?

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3 Marks
5)

What is RSA algorithm? Alice wants to send message a to Bob. Then Bob need to select keys. Suppose, Bob chosen p = 13 and q = 5 in the RSA algorithm. Now, find the value of d. Also, encrypt the message "WE" using Bob's public key so that he can only decrypt. For simplicity, do the encryption and decryption character by character.

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4 Marks
6)

What do you know about link state routing? Using the below topology calculate the routing table for node A.

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4 Marks
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Contributors of this Question:

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Uploaded By: Onebyzero Edu (Test User) July 30, 2024, 10:31 p.m.
Converted By (Img/PDF to Text): Baishakhi Bir Nov. 28, 2025, 4:23 p.m.
Reviewed By: Obaydul Hasan Nayeem Nov. 28, 2025, 5:24 p.m.
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