Introduction to Internetwork

Introduction to Internetwork

What is an Internetwork?

An Internetwork (or internet) is formed when two or more networks are connected together to allow communication between them.

These networks may be:

  • LANs
  • WANs
  • Or a combination of both

Definition

An internetwork is a collection of interconnected networks that communicate with one another as a single system.

Why is Internetworking Needed?

Today, networks rarely exist in isolation.

Organizations often have:

  • Multiple offices
  • Different departments
  • Networks in different locations

To enable communication between all these networks, they are interconnected to form an internetwork.

Example of an Internetwork

Consider a company with:

  • One office on the east coast
  • Another office on the west coast

Each office has its own LAN.

To allow communication between employees in different offices:

  • The company leases a WAN connection from a service provider
  • The WAN connects the two LANs

Now both networks become an internetwork.



Components of an Internetwork

An internetwork may contain:

1. LANs

Provide communication within a local area.

2. WANs

Connect distant networks over large geographical areas.

3. Routers

Connect different networks and route packets between them.

4. Switches

Forward packets within a LAN.

Role of Routers and Switches

Switch

  • Works inside a LAN
  • Sends packets to the correct host
  • Does not forward local traffic outside the LAN

Router

  • Connects multiple networks
  • Routes packets from one network to another

Communication Inside an Internetwork

Communication Within the Same LAN

If a host sends data to another host in the same office:

  • The switch forwards the packet
  • The router blocks the packet from leaving the LAN

Communication Between Different LANs

If a host sends data to another office:

  • Router R1 forwards the packet through the WAN
  • Router R2 receives and forwards it to the destination LAN 
Host → Switch → Router R1 ==== WAN ==== Router R2 → Switch → Host



Private Internet vs Internet

A company’s internally connected networks form a:

  • Private internet (small “i”)

The global worldwide network is the:

  • Internet (capital “I”)

Characteristics of an Internetwork

  • Connects multiple independent networks
  • Enables long-distance communication
  • Uses routers for packet forwarding
  • Can include both LANs and WANs
  • Supports resource sharing and data exchange

Real-Life Examples

  • Corporate branch office networks
  • University campus networks connected across cities
  • Banking networks
  • The global Internet

Importance of Internetworking

Internetworking helps organizations:

  • Share resources
  • Communicate across locations
  • Centralize data
  • Improve collaboration

It forms the foundation of modern global communication.

Summary

An internetwork is created when two or more networks are connected together using devices such as routers. It enables communication between different LANs and WANs and forms the basis of modern communication systems, including the Internet. 

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