This document outlines the questions for a sessional test on data networks. It includes 5 sections with 2 questions each on topics like OSI and TCP/IP models, Ethernet, VLANs, routing protocols, IP addressing, and subnet design. Students are instructed to attempt 2 questions from each section, with each question carrying equal marks. The questions cover explaining layered architectures, protocols on each layer, addressing in TCP/IP, Fast and Gigabit Ethernet, VLAN design methods, virtual circuits vs datagrams, routing protocols like OSPF and BGP, and network design problems involving IP addressing and subnetting.

1. Data Network
1st
Sessional Test
Attempt all questions. All question carry equal marks (2x2=4).
1. Attempt any two questions.
a. Explain OSI model and services on each layer.
b. What is the need of TCP/IP model and how it different from OSI model.
c. Explain any layered architecture (OSI or TCP/IP) with their each layer protocols.
2. Attempt any two questions.
a. Explain relationship of layers and address used in each layer in TCP/IP.
b. Explain Fast Ethernet and Gigabit Ethernet with MAC frame format.
c. What do you understand by Virtual LAN? Why we need this.
3. Attempt any two questions.
a. What are the different methods used for designing VLAN. Explain with example.
b. What do you understand by Virtual circuit and Datagram networks?
c. Explain data plane, control plane and management plane.
4. Attempt any two questions.
a. Explain OSPF protocol with example.
b. Explain BGP protocol with example.
c. Design a network diagram of any organization and shows appropriate devices
(like bridge, switch, router, gateway etc.) used and their places.

2. 5. Attempt any two questions.
a. Answer following questions
i. Given the network address 17.0.0.0, find the class, the block, and the
range of the addresses.
ii. Given the network address 132.21.0.0, find the class, the block, and the
range of the addresses.
b. An organization is granted a block of addresses with the beginning address
14.24.74.0/24. There are 232−24
= 256 addresses in this block. The organization
needs to have 11 subnets as shown below:
I. Two subnets, each with 64 addresses.
II. two subnets, each with 32 addresses.
III. three subnets, each with 16 addresses.
IV. four subnets, each with 4 addresses.
Design the subnets.
c. An ISP is granted a block of addresses starting with 190.100.0.0/16 (65,536
addresses). The ISP needs to distribute these addresses to three groups of
customers as follows:
i. The first group has 64 customers; each needs 256 addresses.
ii. The second group has 128 customers; each needs 128 addresses
iii. The third group has 128 customers; each needs 64 addresses.