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