Computer Networks & Data Communication Essentials

A Comprehensive Guide to Internet Technologies: From Basics to Advanced Protocols and Security Measures

What you'll learn

Computer Network Essentials

StackHow Internet & Computer Networks Work?

Over All TCP/IP Protocol Stack

Important Application Layer Protocols

TCP & UDP as Transport Layer Protocls

IP Addressing: Classless InterDomain Routing (CIDR)

Working of Switches & Routers

Different Routing protocols & their comparison

NAT, ICMP, ARP

Multiple Access Protocols: ALOHA, Slotted ALOHA, CSMA/CD

Ethernet Protocol

Virtual LANS (VLANs)

Requirements

Be ready to learn

A Computer or laptop with internet connection

No Prior Computer Networks' Knowledge Required

Description

This meticulously designed program is tailored for beginners and aspiring IT professionals, providing a solid foundation in the core principles of computer networking & data communication. Whether you're a student venturing into the world of technology or a professional looking to strengthen your skills, this course offers a practical and accessible approach to understanding the fundamentals of computer networks.By the end of this course, you will have a comprehensive understanding of computer network essentials, empowering you to navigate the dynamic world of networking confidently. Join us on this educational journey, and let's build a strong foundation for your success in the exciting field of computer networks!Sections Breakdown:Introduction to Computer Networks:Explore the essentials of the internet, dissecting the components that form its backbone.Understand the roles of hosts, clients, and servers in network communication.Navigate through the Access Network, Core Network, and the overall architecture of the internet.Gain insights into the layers of the Internet Protocol (IP) stack.Application Layer:Dive into networking applications and their design principles, including Client-Server and Peer-to-Peer architectures.Learn the intricacies of processes communicating through sockets.Explore protocols such as HTTP, FTP, SMTP, and DNS that drive internet applications.Understand the working of web caches and the BitTorrent file-sharing application.Transport Layer:Differentiate between the Transport and Network layers.Compare and contrast TCP and UDP, delving into their segment structures and flow control mechanisms.Explore the intricacies of the TCP three-way handshake and connection closure.Network Layer:Understand the functions of routers, focusing on routing and forwarding.Grasp the nuances of IP addressing, subnets, and hierarchical addressing.Explore dynamic protocols like DHCP and NAT, essential for efficient network management.Gain insights into routing types, including static and dynamic, and Inter-AS routing protocols like BGP.Learn about ICMP, IPv6, and the complexities of routing on the Internet.The Link Layer:Delve into the services provided by the Link Layer, covering framing, link access, reliability, and more.Understand the role of network interface cards (NIC) and the communication between adjacent nodes.Explore multiple access protocols, controlled access protocols, and address resolution with ARP.Learn about Ethernet, switches, and the motivation behind using Virtual LANs (VLANs).The Physical Layer:Trace the evolution of IEEE 802.3 Ethernet standards and common implementations of fast Ethernet.Computer Network Security:Gain insights into firewalls, their types, and their critical role in network security.Explore stateless and stateful packet filtering, application gateways, and best practices for securing computer networks.Join us on this educational journey, where you'll not only learn the essentials but also delve into advanced protocols and security measures.

Overview

Section 1: Introduction

Lecture 1 What is a Computer network?

Lecture 2 Nuts and Bolts of Internet

Lecture 3 Nuts and Bolts of Internet-Network Edge Devices "Hosts": Clients and Servers

Lecture 4 Nuts and Bolts of Internet-Access Network & Core Network

Lecture 5 Internet Structure: Network of Networks

Lecture 6 How to Solve the Complexity of Internet-Computer Networks

Lecture 7 Layered Approach To Solve Complexity: Air Travel Example

Lecture 8 Internet Protocol (IP) Stack

Lecture 9 Physical Layer

Lecture 10 Datalink Layer

Lecture 11 Network Layer

Lecture 12 IP Address Format for IPv4

Lecture 13 Transport Layer

Lecture 14 Application Layer

Section 2: The Application Layer

Lecture 15 The Reason Internet Exists: Networking Applications & Their Design Principle

Lecture 16 Types of Network Applications: Client-Server Architecture

Lecture 17 Types of Network Applications: Peer-to-Peer Architecture

Lecture 18 Examples of Application Layer Protocols

Lecture 19 Transport Service Requirements for Different Application Layer Protocols

Lecture 20 How Processes Communicate using Sockets?

Lecture 21 TCP Vs UDP as the Transport Layer Protocols

Lecture 22 Transport Layer Protocols Used by the Notable Application Layer Protocols

Lecture 23 Hypertext Transfer Protocol (HTTP) & Anatomy of a Webpage

Lecture 24 Overview of HTTP Protocol

Lecture 25 Persistent & Non-Persistent HTTP

Lecture 26 Non-Persistent HTTP Example

Lecture 27 Per Object Response Time in Non-Persistent HTTP

Lecture 28 Response Time Comparison Between Persistent & Non-Persistent HTTP

Lecture 29 General Format of an HTTP Request Message

Lecture 30 HTTP Request Methods

Lecture 31 General Format of an HTTP Response Message

Lecture 32 HTTP Response Status Codes

Lecture 33 Why use Cookies to Maintain Client-Server State

Lecture 34 Application of Cookies

Lecture 35 Maintaining Client & Server State Using Cookies

Lecture 36 Displaying a Web Page with AD without using Cookies

Lecture 37 Use Third Party Cookies To Track a User's Behaviour & Display Targeted Ads

Lecture 38 Cookies and Privacy Concerns

Lecture 39 How Web Cache (aka Proxy Server) Works?

Lecture 40 Conditional GET to Update the Web Cache

Lecture 41 Introduction to File Transfer Protocol (FTP)

Lecture 42 FTP: Separate Control & Data Connections

Lecture 43 FTP Commands & Responses

Lecture 44 Simple Mail Transfer Protocol (SMTP) & Components of an Internet E-mail System

Lecture 45 Example Scenario: Alice Sends an E-mail to Bob

Lecture 46 An E-mail Message Format

Lecture 47 SMTP Protocol Description (RFC 5321)

Lecture 48 An Example of SMTP Client-Server Interaction

Lecture 49 Mail Access Protocols: POP, IMAP, HTTP

Lecture 50 Introduction to Domain Name System (DNS)

Lecture 51 Basic Working Principle of DNS

Lecture 52 Root, Top-Level Domain and Authoritative Servers

Lecture 53 DNS Name Resolution: Iterated Query

Lecture 54 DNS Name Resolution: Recursive Query

Lecture 55 Caching of DNS Information To Improve Response Time

Lecture 56 BitTorrent: Peer-to-Peer File Sharing Application

Lecture 57 BitTorrent: Tit-for-Tat Upload Priority

Section 3: The Transport Layer

Lecture 58 Introduction to the Transport Layer

Lecture 59 Transport Vs Network Layer

Lecture 60 Two Principal Transport Layer Protocols: TCP & UDP

Lecture 61 Transport Layer Multiplexing/Demultiplexing

Lecture 62 How Transport Layer De-Multiplexing Works?

Lecture 63 UDP (Connection-less) Demultiplexing: An Example

Lecture 64 TCP (Connection-Oriented) Demultiplexing: An Example

Lecture 65 User Datagram Protocol (UDP) Overview

Lecture 66 Use Cases of UDP

Lecture 67 UDP Segment Format

Lecture 68 UDP Checksum

Lecture 69 Transmission Control Protocol (TCP) Overview

Lecture 70 TCP Seq. Numbers & ACKs

Lecture 71 Bidertional Data Transfer Using TCP

Lecture 72 TCP Reliability: Re-transmissions due to timeout events & Three Duplicate Acks

Lecture 73 TCP Re-transmission Scenarios

Lecture 74 TCP Segment Structure

Lecture 75 TCP Flow Control

Lecture 76 TCP Congestion Control Approach

Lecture 77 Three Components of TCP Congestion Control: 1) Slow Start

Lecture 78 2) Congestion (TCP Tahoe)

Lecture 79 3) Fast Recovery (TCP Reno)

Lecture 80 TCP Three-Way Handshake

Lecture 81 Closing a TCP Connection

Section 4: The Network Layer

Lecture 82 Introduction to the Network Layer

Lecture 83 Two Key Functions of Router: Routing and Forwarding

Lecture 84 IP Range Aggregation and Longest Prefix Matching in Routing Tables

Lecture 85 IP Addressing: A Data Network Example

Lecture 86 IP Addressing: What is an interface?

Lecture 87 IP Addressing: Subnets

Lecture 88 Example: How many Subnets?

Lecture 89 Internet IP Address Assignment Strategy

Lecture 90 Hierarical Addressing: More Efficient Routing

Lecture 91 Classless InterDomain Routing (CIDR)

Lecture 92 How Does a Host Get An IP Address? Dynamic Host Configuration Protocol (DHCP)

Lecture 93 Network Address Translation (NAT): Why NAT?

Lecture 94 Principle of NAT

Lecture 95 A NAT Scenario

Lecture 96 Advantages of NAT

Lecture 97 The NAT Traversal Problem

Lecture 98 What is Routing and its Types? Static Vs Dynamic Routing

Lecture 99 What is an Autonomous System (AS)? Intra-AS & Inter-AS Routing Protocols

Lecture 100 Types of Interior Gateway Routing Protocols (IGPs): 1. Distance Vector Routing

Lecture 101 2. Link State Routing

Lecture 102 Why Inter-AS Routing Protocol is Used?

Lecture 103 Example of Inter-AS Routing

Lecture 104 Example of Inter-AS Routing: Choosing Among Multiple ASes

Lecture 105 Inter-AS Routing on Internet using Border Gateway Protocol (BGP)

Lecture 106 Internet Control Message Protocol (ICMP)

Lecture 107 ICMP Error Message Example: Time Exceeded

Lecture 108 Traceroute

Lecture 109 Ping Command Using ICMP Echo & Reply Messages

Lecture 110 IPv6 IP Address

Section 5: The Link Layer

Lecture 111 Introduction to the Link Layer

Lecture 112 Why Different Link Layer Protocols for Different Physical Links?

Lecture 113 Router Vs Switch

Lecture 114 Services Provided by the Link Layer: Framing, Link Access, Reliability

Lecture 115 Services Provided by the Link Layer: Flow Control, Error Detection & Correction

Lecture 116 What is Network Interface Card (NIC) & how Adjacent Nodes Communicate using NIC?

Lecture 117 Main Types of Link Access Protocols

Lecture 118 Types of Multiple Access Protocols: 1) Channelization Protocols

Lecture 119 Example of FDMA & TDMA

Lecture 120 Types of Multiple Access Protocols: 2) Random Access Protocols

Lecture 121 Pure ALOHA

Lecture 122 Pros and Cons of Pure ALOHA

Lecture 123 Slotted ALOHA Protocol and its Pros & Cons

Lecture 124 Carrier Sense Multiple Access with Collision Detection (CSMA/CD)

Lecture 125 Ethernet CSMA/CD Algorithm

Lecture 126 Controlled Access (Taking Turns) Protocols

Lecture 127 Polling Based Controlled Access Protocols

Lecture 128 Token Passing Controlled Access Protocols

Lecture 129 IP Vs MAC Address

Lecture 130 Portability of the MAC Address

Lecture 131 Address Resolution Protocol (ARP)

Lecture 132 ARP Protocol in Action

Lecture 133 Routing of IP Packets from One Subnet to Another Subnet

Lecture 134 Ethernet & Its Physical Topology

Lecture 135 Ethernet Frame Structure

Lecture 136 Ethernet: Unreliable, Connection-less

Lecture 137 Ethernet Switch & Its Properties

Lecture 138 How Switch Self-learns the Forwarding Table?

Lecture 139 Switch Working Algorithm

Lecture 140 An Example of Switch Self-learning & Forwarding

Lecture 141 Self learning of Switch Forwarding Tables in Case of Interconnected Switches

Lecture 142 Motivation For Using Virtual LANs (VLANS)

Lecture 143 Problem with VLANs Spanning Multiple Switches

Lecture 144 VLAN Trunking

Section 6: The Physical Layer

Lecture 145 Evolution of IEEE 802.3 Ethernet Standards: Link & Physical Layer

Lecture 146 Common Implementations of Fast Ethernet: Physical Layer of 10Base2 & 10Base5

Lecture 147 Common Implementations of Fast Ethernet: Physical Layer of 10BaseT

Lecture 148 Common Implementations of Fast Ethernet: Physical Layer of 10BaseF

Lecture 149 Common Gigabit and Fast Ethernet Implementation

Section 7: Computer Network Security

Lecture 150 What is a Firewall?

Lecture 151 Why Firewalls are used?

Lecture 152 Types of Firewalls: 1) Stateless Packet Filtering

Lecture 153 Network Security Policy For Packet Filtering

Lecture 154 Stateless Packet Filtering Implementation as Access Control List

Lecture 155 Drawback Of Stateless Packet Filtering

Lecture 156 2) Stateful Packet Filtering

Lecture 157 Stateful Packet Filering in Access Control List

Lecture 158 Application Gateways

Beginners in IT and networking field