Networking Components By: Michael J. Hardrick

HUB  A low cost device that sends data from one computer to all others usually operating on Layer 1 of the OSI model.  Range from $10 to $150

Switch  A device that relays traffic by using Layer 2 address.  It usually contains software that supports the building of routing table.  Range from $10 to $2,500.

Bridge  Like a Switch it relays traffic, but with a LAN device.  Ranges from $50- $300

Router  They operate on at OSI Layer 3 with IP addresses.  High-end routers can also be configured to as firewalls and extensive network management features.  Range from $50 to $1,500

Firewall  A security feature on a network that filters unwanted traffic from entering a network computer.  Range from $300 to $3,000.

Gateway  The activities of a gateway are more complex than that of the router or switch as it communicates using more than one protocol  Can operate at any network layer  Range from $100 to $300

Wireless AP  A device that allows wireless devices to connect to a wired network using Wi-Fi, or related standards.  The AP usually connects to a router (via a wired network) as a standalone device, but it can also be an integral component of the router itself.  Range from $20 to $100

Example Diagram  The next slide will show you a picture diagram with all the devices.  A place this will be used are large corporations, and cities, school districts, and etc.

Network Diagram