BCA DCA2201 COMPUTER NETWORKING

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Description

SESSION FEB-MARCH 2025
PROGRAM BACHELOR OF COMPUTER APPLICATIONS (BCA)
SEMESTER IV
COURSE CODE & NAME DCA2201 COMPUTER NETWORKING

 

 

Set-I

 

Q1. Why is layered model used for computer networks? Explain OSI referenced model

Ans 1.

Layered Architecture in Networking

A layered model in computer networks is essential to simplify the design, development, and maintenance of complex network systems. The primary reason for adopting a layered model is to break down the communication process into manageable, well-defined parts that can work independently and interdependently. Each layer performs a specific function and provides services to the layer above it while receiving services from the layer below. This modular approach enhances flexibility, interoperability, and standardization.

The separation

 

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Q2. Discuss the working of stop and wait protocol in a noisy channel with the help of an example 10           

Ans 2.

Working of Stop-and-Wait Protocol in a Noisy Channel

Stop-and-Wait Protocol

The Stop-and-Wait protocol is a data link layer communication protocol that ensures reliable data transmission between two devices over a network. In this method, the sender sends one data frame at a time and waits for an acknowledgment (ACK) from the receiver before sending the next frame. This approach is simple but efficient for low-speed or low-error-rate networks.

Handling a Noisy Channel

A noisy channel is one that

 

Q3. Give a contrast between unicast, multicast and broadcast. Also explain the way they implemented.        10           

Ans 3.

Comparison Between Unicast, Multicast, and Broadcast with Implementation

Data Transmission Modes

In computer networking, the mode of data transmission refers to the way information is sent from a source to one or multiple destinations. Unicast, multicast, and broadcast are the three primary methods of transmission, each serving different purposes based on the network’s needs and efficiency requirements.

Unicast Transmission

Unicast is the one-to-one

 

Set-II

 

  1. Explain various routing methods follow in network layer. Discuss their purpose in different environments. 5+5

Ans 4.

Routing Methods Used in the Network Layer and Their Purpose in Various Environments

Understanding Routing in the Network Layer

Routing in the network layer refers to the process of selecting the optimal path for data packets to travel from source to destination. This function is crucial for interconnecting networks and ensuring efficient data delivery. The network layer uses routing protocols and algorithms to determine the best path

 

Q5. Explain the process of controlling congestion in the transport layer in detail with the help of examples. 10           

Ans 5.

Congestion Control in the Transport Layer with Examples

Congestion in Networking

Congestion in computer networks occurs when network resources such as bandwidth or buffers are overutilized, causing delays, packet losses, and reduced throughput. The transport layer plays a vital role in managing this issue by implementing congestion control mechanisms that help regulate data flow and maintain performance stability.

Unlike flow control, which manages data transfer between sender and receiver, congestion control focuses on the

 

Q6. Compare between the lossy and lossless compression. Discuss the tradeoff between these. 10     

Ans 6.

Comparison Between Lossy and Lossless Compression and Their Trade-offs

Understanding Data Compression

Data compression is a technique used to reduce the size of data files to save storage space and transmission time. Compression can be lossy or lossless, depending on whether the original data can be perfectly reconstructed after decompression. The choice between these two depends on the type of data, required