MCA_DCA6204_Advanced Computer Networks_InternalAssignments_Set1_2




Q1. Discuss the functions of layers of OSI model and compare it with TCP/IP model.  5+5     10


OSI model: The Open Systems Interconnection (OSI) reference model was defined by the International Standards Organization (ISO) as a first step towards international standardization. In 1995, it was revised and known as ISO OSI (Open System Interconnection) because it deals with systems that are open for communication with other system. The model has seven layers. They are: physical layer, data link layer, network layer, transport layer,

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Q2. Compare Circuit and Packet Switching with example. Describe some SONET/SDH devices.       5+5     10

Ans (2).

Circuit switching: Circuit  switching  assures  dedicated  communication  link  between  two stations. Usually this types of networks consists a set of switches connected by a sequence of links. On each physical link, a logical channel is dedicated to  the  connections.  And  each  link  is  divided  into  n  channels  by  using different  multiplexing  techniques.  Circuit  switching  method  follows  three steps for a successful communication. These are: circuit establishment

Q3. Explain the data transfer steps of Frame Relay call control. Explain TCP retransmission strategy. 5+5   10


Call control: As we have seen frame relay supports multiple connection over the single line and these connection are called data link connection. For each connection there exist a unique DLIC (Data link Connection Identifier).

Following steps are


Q4. What are the differences between dynamic routes and static routes, explain with example? Explain the functioning of the Open Shortest Path First (OSPF) protocol.     5+5      10


Dynamic Routes: Dynamic routes are typically learned by the routing protocols RIP, OSPF and BGP. Routers that use the routing protocols exchange information in their routing tables by advertising. Using dynamic routes,  the 

Q5. Discuss the problems of symmetric key cryptography, discuss with suitable example. Explain RSA technique with an example.  5+5      10


Q6. Explain single and multi-server queues. What is feedback mechanism for preventing network congestion and discus feedback information?    5+5        10


Single server queue: The important element in a single server queue is the server, which provides services to packets. Different packets arrive at the system to be served. If the server is idle at the time of packet arrival, the packet is served immediately. Otherwise arriving packets enter into a waiting queue. When the server completes serving a