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Core Subjects in Computer Science

Network is a collection of nodes¹ connected via links².

Any device connected to the internet is known as host / end-system.
Connections are made using communication links and packet switches .
- routers and link-layer switches are two types of packet switches
transmission rate is measured in bits/s

packet

A collection of segments of information attached with header.

route : path from ‘Source’ to ‘Destination’
Analogy of packet-switched network
- truck taking a delivery from Source to destination
ISP ( internet service provider): provides internet to end users.
- provides internet connectivity

Layered architecture

Ticket system at airplane reservation

Transport Layer

data link layer is for node to node delivery of data
network layer is used for datagram ³ delivery.
transport layer is used for process to process delivery of packets.
server-client relationship

References

What is a subdomain? | Domains - GoDaddy Help IN

Footnotes

Computers / Devices that share data or communicate over the network ↩
Communication channels / wires for making connections between devices ↩
A self-contained, independent entity of data carrying sufficient information to be routed from the source to the destination computer without reliance on earlier exchanges between this source and destination computer and the transporting network.” ↩