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Computer Network (CS2002)

Introduction to Computer Network

Computer Science Department, SOA University

Dr. Rourab Paul

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Computer Netwrok

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How?

When you type google.com and press Enter, more than 10 different network steps happen in less than 0.5 seconds

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How does your laptop find Google?�

How does Google find you back?�

How does data not mix with others?

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Who?

Who controls the internet?

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“People who understand computer networks.”

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Career

Career Opportunity

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Cybersecurity�Cloud computing�DevOps�5G�IoT�Ethical hacking

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Why?

You → WiFi → Router → ISP → Internet → Server

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“Everything here is invisible—but absolutely real.”

Lets Check our understandings

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OSI Layer

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Layers and Addresing

Data Link Layer

  • Manages physical addressing, error detection, and access to the medium.
  • Uses MAC addresses (Media Access Control).
  • Example Protocols: Ethernet, Wi-Fi.

Network Layer

  • Handles logical addressing and routing of packets across different networks.
  • Uses IP addresses (Internet Protocol).
  • Example Protocols: IPv4, IPv6, ICMP.

Transport Layer

  • Ensures reliable data transfer and segmentation/reassembly of data streams.
  • Uses Port numbers for process-to-process communication.
  • Example Protocols: TCP, UDP.

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Addresses in Network

MAC Address (Data Link Layer)

  • Purpose: Uniquely identifies devices on the same local network.
  • Format: 48 bits (e.g., 00:1A:2B:3C:4D:5E).
  • Usage: Used in Ethernet frames for communication within the same subnet.

IP Address (Network Layer)

  • Purpose: Logical addressing for devices across different networks.
  • Format: IPv4 (32-bit, e.g., 192.168.1.1), IPv6 (128-bit, e.g., 2001:0db8::1).
  • Usage: Routes packets across networks via routers.

Port Number (Transport Layer)

  • Purpose: Identifies specific processes or services on a device.
  • Range: 0–65535 (e.g., 80 for HTTP, 443 for HTTPS).
  • Usage: Allows multiple applications to use the network simultaneously.

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Room, timetable, teacher

  • Teacher : Dr. Rourab Paul
  • Room and Timetable
  • Theory: 11:00 – 11:50 Monday, 246 AB3
  • Lab: 11:50 – 12:40 & 13:40-24:30, 14:40-25:30 Monday, Lab 15 & Lab 16 AB3
  • Theory: 08:10 – 09:00 Tuesday, 246 AB3
  • Theory: 11:50 – 12:40 Friday, 246 AB3
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Evaluation Procedure

Theory: 100 Marks:

    • End Sem (Written): 50 marks
    • Mid Sem (Written): 30 Marks
    • CIA : 20 Marks

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Lab: 100 Marks

  • CIA : 80 Marks
    • Lab record 10 marks
    • CIA 70 Marks
  • Lab Exam : 20 marks

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Where The Web was Born

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Thank You

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Netflix spends millions just to avoid buffering. That is computer networking.