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Data communication and network using python

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Introduction to Data Communication and Networking (DCN) Data Communication and Networking (DCN) is a critical field in computer science and information technology that focuses on the exchange of data between devices over a communication channel. It encompasses the principles, technologies, and protocols required to enable seamless communication, ensuring data integrity, speed, and security. In an increasingly interconnected world, DCN forms the backbone of the internet, corporate networks, and global communication systems. By understanding DCN, individuals can design, manage, and troubleshoot networks that support a wide array of applications, including social media, streaming services, e-commerce, and enterprise operations. The DCN Notes provide a structured and comprehensive guide to understanding the principles and mechanisms of data communication and networking. These notes are designed to cover the following aspects: 1. Basic Concepts - Understanding the fundamentals of communication, such as signals, transmission media, and data encoding. 2. Network Models - Detailed exploration of the OSI and TCP/IP models, explaining the roles of each layer in network communication. 3. Networking Devices - Insights into the hardware components like routers, switches, hubs, and their roles in data transmission. 4. Protocols and Standards - Explanation of key protocols like TCP, IP, HTTP, FTP, and SMTP, and how they enable smooth communication across devices. 5. Routing and Switching - Concepts of routing algorithms and switching techniques used to optimize data transfer in networks. 6. Wireless and Mobile Communication - Overview of wireless communication technologies, including Wi-Fi, Bluetooth, and cellular networks. 7. Network Security - Introduction to encryption, firewalls, and security protocols essential for safeguarding data in transit.

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Enumerate the types of errors?
Answer:
 Syntax errors: Errors in the grammar or syntax of the programming language.
 Runtime errors: Errors that occur during the execution of a program, such as division by
zero or accessing an array out of bounds.
 Logical errors: Errors in the logic of the program that cause incorrect results.
List out the Taxonomy of Medium Access Protocol.
Answer:
 Random access protocols:
 ALOHA
 CSMA
 CSMA/CD
 CSMA/CA
 Token passing protocols:
 Token ring
 Token bus
 Polling protocols:
 Polling


Write a python code for identify host name
Answer:
import socket

def get_host_name():
hostname = socket.gethostname()
return hostname

if __name__ == "__main__":
print(get_host_name())

Compare and contrast CSMA/CD and CSMA/CA
Answer:
Compare and contrast CSMA/CD and CSMA/CA:
 CSMA/CD (Carrier Sense Multiple Access with Collision Detection): Used in Ethernet
networks. If a collision occurs, all devices stop transmitting for a random time before
retrying.
 CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance): Used in
wireless networks. Devices listen for the channel to be idle before transmitting. If a
collision is detected, they use a backoff algorithm to avoid retransmitting immediately.

Show how the address 47:20:1B:2E:08:EE is sent out on line.
Answer:
01000111 00100000 00011011 00101110 00001000 11101110

, Define Token Passing.
Answer:
Token passing is a medium access control (MAC) protocol used in some local area networks.
It involves passing a special token (a control frame) around the network in a circular fashion.
Only the device holding the token is allowed to transmit data. This ensures that only one
device transmits at a time, preventing collisions.

Create a python code for to download webpage using TCP socket
Answer:

Algorithms:
1. Create the TCP/IP Socket
2. Connect as client to selected Server on the specified port
3. Send HTTP request and Receive HTTP response
4. Close connection - 2 marks
Graphical Representation of download webpage




Python code:
import socket

clientSocket = socket.socket()

clientSocket.connect(("hindustanuniv.ac.in", 80))

clientSocket.sendall(b"GET /

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Uploaded on
November 30, 2024
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Written in
2024/2025
Type
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