CCN Module : I : Communication Networks & Services ( 20 Marks ) By Kamal Rochlani

N.B: Questions printed in different color were asked in Mumbai University exams.

Network functions & Network Toplogy (Q: 1)(A) What is Network? Explain the following different categories of Networks:

(1) LAN , WAN & MAN (2) Wireless Networks (3) Home networks (4) Internet (5) Intranet 5 OR

Explain various categories of networks. 5 OR Compare LAN ,MAN ,WAN. 5 (B) Compare Peer-to-peer network & client-server Network. 5

(Q:2) What is network Topology? Explain all the various topologies in detail. 10 OR Write short note on: Network Topologies 10 OR What is Topology? Explain the following basic topologies in detail with DIAGRAM, ADVANTAGES & DISADVANTAGES: (1) BUS (2) Ring /Circular (3) Star (4) Tree (5) Mesh (6) Hybrid 10 OR Compare & Contrast the following topologies:

I. Star & Mesh topology II. Star & Bus topology 10

III. Star & Ring topology

(Q:3) (A)Which topology is best among all to be used by considering all factors for designing the network? Why? 4 (B) In a Computer lab, every computer has dedicated point to point link to every other computer. How Many Computers are required to link 10 physical channels? Also Name, Which topology is used in Computer lab? 5 (C) A business man wants to set up LAN where number of nodes may increase or decrease depending on business Success. Which topology you will suggest with justification? 5

Basics of Message, Packet, Circuit & Cell Switching (Q:4) (A)What is switching? Explain the difference between Circuit, Packet & message switching using diagram. Also draw their timing diagrams. 10 (B) Explain why message switching is not preferred for the data transfer through the computer networks? Explain With suitable example what factors decide on:

1. The layer this functionality is placed. 2. Packet length 09

Application & Layered Architectures (Q:5) Explain the need for layered architecture of computer network. 4 (Q:6) What is Protocol? Write its functions. 3 (Q:7) Define: (1) Peers (2) Interface 2

BE EXTC SEM VII -2- CCN QB By Kamal Rochlani

The OSI reference Model (Q:8) Explain the basic Principle of layered OSI network architecture. 5 OR Which are the key plus points of layered approach in architecture of network? 04 (Q:9) What is difference between Protocol & service Interface? Explain your answer in terms of the OSI 7 layer model 5 (Q:10)(A)Draw the layered OSI network architecture. Explain the function of each layer & show the path of Actual & virtual Communication between the layers. 10 OR What is open system? Explain OSI model by drawing sender, receiver, intermediate node, & variousCommunication between them. 10 (B) What tasks are performed by the transport layer? 05 (C) What are the functions of the transport layer in OSI model for network communications? Explain TCP Multiplexing & error recovery. 16 (D) Explain synchronization & activity management from the session layer. 6 (E) Error control procedures are specified in each layer of the OSI reference Model. Indicate the layers at which each of the following errors might occur.

1. Noise on the transmission link converts a 0 bit to a 1 bit. 2. A packet is routed to the wrong destination. 3. A frame is received out of sequence. 4. A packet switching network delivers a data unit to terminal attached to it out of sequence. 5. A printer printing halfway through a line is suddenly commanded by mistake to return to the beginning

of a line. 6. During a half duplex mode session the transmitting user starts receiving data from the user at the other

end. 10 (Q:11) What is the difference between Network layer delivery & transport layer delivery? 5

Unified View of Layers, Protocols & Services (Q:12) What is unified view? Explain unified view of layer, Protocols & services in OSI reference model. 8

Overview of TCP/IP architecture (Q:13) (A)Draw & explain each layer of TCP/IP architecture. 10 OR Draw the protocol stack of internet & explain each layer in detail. 10 OR Write short note on TCP/IP model. 05 (B) Explain FTP in detail. 08

BE EXTC SEM VII -3- CCN QB By Kamal Rochlani (Q:14) List the two ways in which the OSI reference model & TCP/IP reference model are the same & two ways in which they are different? 5 OR Compare ISO-OSI model with TCP/IP model. 10

TCP/IP Protocol (Q:15) Explain TCP/IP protocol. 16