WAN Topologies

Question 1

Definition

Answer 1

A wide area network (WAN) is a large computer network that connects groups of computers over large distances. It often links multiple local area networks (LANs).

Question 2

Purpose:

Answer 2

WANs are commonly used by large businesses to connect their office networks. Each office typically has its own LAN, and these LANs connect via a WAN.

Question 3

Connectivity

Answer 3

Geographically dispersed LANs are connected together by a WAN. WAN connectivity is generally provided by a service provider.

Question 4

Tunneling

Answer 4

Customers can connect LANs securely over the WAN using tunneling, often through a site-to-site VPN. The service provider’s routers and switches are invisible to the customer’s LAN.

Question 5

Representation

Answer 5

On topology diagrams, a WAN is often depicted as a cloud to represent the interconnectedness of LANs.

Question 6

Older Technologies

Answer 6

Examples of older WAN technologies include T1 and T3 leased lines, which offer point-to-point connectivity, and Frame Relay and Asynchronous Transfer Mode (ATM), which provide point-to-multipoint connectivity.

Question 7

Newer Technologies

Answer 7

More recent WAN technologies include Multiprotocol Label Switching (MPLS) and Metro Ethernet