On the other side, LAN (Local Area Networks) are found in every type of company, office and home. These "small" networks (compared to WAN networks) are fast, much cheaper and easy to maintain in most situations. Today, we have LAN networks running at speeds that touch the 10 Gbps mark, making them lightening fast. The equipment required to run these networks is not considered that expensive, plus, they are easy to maintain.
MAN (Metropolitan Area Networks) are somewhere in between WAN and LAN networks. They can spread over a city or two and connect smaller office (LAN) networks between them. The equipment required to run them can be a bit expensive and the speeds they usually reach are the 50-100 Mbps mark depending on the way they interconnect.
Do you have questions about networking, VPN security or VoIP? Then visit Firewall.cx, one of the few websites recommended by Cisco Systems in its world class Cisco Academy program.
Each type of network uses their own special set of protocols in order to ensure they operate in the most efficient way, without outages and problems. These protocols vary depending on the type of network. For example, LAN networks usually run the Ethernet Protocol allowing local nodes/workstations to communicate between each other.
STP (Spanning Tree Protocol) is also another frequently used protocol that makes sure no network loops are created between switches. MAN and WAN protocols may use routing protocols whose job is to make sure everyone knows about the available networks and how they can be reached.
In WAN protocols, you also won't find traditional equipment such as switches or hubs. They only exist in the LAN networks. WAN and MAN networks make use of more sophisticated equipment such as routers that are designed to help connect between each other at high speeds. Routers are found at the boundary of a LAN network, connecting them to larger networks (WANs).
I hope this brief introduction helps make things a big more clearer. For more information, please visit SearchNetworking.com's networking FAQ guide.
This was first published in July 2008