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Chapter 1 · Watch, then practise

Introduction to Computer Network

Follow a message from an application through transport, Internet and link layers. Separate each layer’s responsibility before reasoning about end-to-end communication.

3 questions · 3 with related videos. Matches are based on playlist titles; broader background matches are labeled.

What to study

  • Internet layers
  • Hosts and routers
  • Encapsulation

Chapter playlists

Existing chapter playlist

Notes

OSI vsTCP/IP model comparision with Trick to remeber in Hindi | Computer network series

Last moment tuitions · 7:29

Compares the TCP/IP and OSI layer models used to organize the answer.

1. Layer responsibilities

What does each layer of the Internet protocol suite contribute?

Applications define useful exchanges. Transport connects application endpoints. IP addresses and forwards datagrams across networks. The link layer transfers packets over a directly connected network. Each layer uses services below it and exposes a service above it.

How All Layers Work Explained with Example Part-1 in Hindi ll Computer Networks Course

5 Minutes Engineering · 13:13

Choose a video · 2 lectures

Layer-by-layer examples support following encapsulation through a web request.

2. Follow a web request

Place application data, a TCP segment, an IP datagram and a link frame in transmission order.

Application data becomes the payload of a TCP segment; the segment is carried in an IP datagram; that datagram is carried by a link frame. The receiving host removes these wrappers in reverse order.

The Internet: Crash Course Computer Science #29

CrashCourse · 11:58 · Background lecture

Internet and packet-routing background for distinguishing routers from end hosts.

3. Router or host?

Two hosts communicate through a router. Where does basic IP forwarding happen, and where is end-to-end transport handled?

The router forwards IP datagrams toward their destination. Transport endpoints are on the hosts. A router forwarding a datagram does not, by that action alone, acknowledge receipt to the application or guarantee its delivery.

References