Notes

Networks Types

Network classification:

  • Size
  • geographical coverage
  • Ownership

There are two types networks.

• Local Area Networks
(LANs)
• Wide Area Networks
(WANs)

Local Area Networks

  • Usually Privately owned
  • Connects some hosts in
  • a single office, building, r campus
  • Can be as simple as two
  • PCs and a printer in
  • someone’s a home office
  • Can extend throughout
  • a company
  • Host Address

Local Area Networks

Additional Information

HUB:

It only broadcast data.
A hub works at the physical layer (layer 1) of
the OSI model. A repeater hub also
participates in collision detection, forwarding a
jam signal to all ports if it detects a collision.

SWITCH:

On the base of physical address, data can be
transferred.
Switch contains its own table in which it
contains physical addresses of connected
devices.
A switch works at Layer 2 of the OSI
model — the data-link layer. It is a LAN
device that can also be called a multiport
bridge. A switch forwards Ethernet frames
between Ethernet devices. Switches do not
care about IP addresses, nor do they even
examine IP addresses as the frames flow
through the switch.

Bandwidth:

It is a range of frequency.
Like FM 99 it works on 99

Router:

Outside a LAN. It works with IP address.
Routers operate on the third layer of the
OSI Model, the Network-Control Layer.
Rather than passing packets based on the
Media Access Control
(MAC) Layer addresses
(as bridges do), a router examines the
packet’s data structure
and determines whether or not to forward it.


Hz frequency

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