Network Components Basics!

Network HUB

Used to connect multiple Ethernet devices together

Layer 1 of the OSI model

Not used much today

Bringing it all together

Network Switch

Similar in appearance to a hub

Connects network devices together using packet switching

Layer 2 of the OSI model

Advanced switching that have some routing capabilities are known as “layer 3 switches”

Network Router

Forwards packets between different computer networks

Most homes and small offices use routers to connect to the internet (typically the router is connected to a cable or dsl modem)

Layer 3 of the OSI model

Network Bridge

Used to join two or more networks that use the same protocols

Layers 1 & 2 of the OSI model

Gateway

Connects two or more networks that use different protocols

Can run at any layer in the OSI model

Firewall

Acts as a barrier to keep unwanted traffic and users from your network

Operating systems can have their own built in firewalls to protect themselves

Can be found in network devices such as switches or can be installed as applications running on servers

Normally can be found at OSI layers 1 through 4

Wireless Access Point

Provides network access for portable devise.

Commonly known as “Wi-Fi”

Often integrated with a home based router

Can also be used to extend the range of a wireless network