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WAN

Wide Area Network

The extensive network linking remote sites or providing Internet access.

TopicIT knowledge → About 1 min read

Simple definition

The WAN connects networks that are not in the same place, often through a telecom operator.

Technical definition

A Wide Area Network can use the Internet, MPLS, SD-WAN, leased links or mobile networks. On a firewall, WAN frequently refers to the interface connected to the ISP.

What is it used for ?

Connect multiple agencies or connect a local network to the Internet.

Practical example

The headquarters and an agency communicate through two Internet accesses connected by a VPN IPsec.

Common issues

  • Operator cut
  • Latency or loss of packages
  • Amended public address
  • Poor road or rocking SD-WAN

Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.

Related resources

Relevant topic LAN Local network connecting the equipment of a home, office or site. Relevant topic VPN A VPN establishes an encrypted connection between a remote device or network and a VPN gateway over an untrusted ne... Relevant topic Router A router forwards IP packets between networks using the destination address and a routing table. Relevant topic Firewall A firewall filters network communications using security rules that allow or block traffic based on its characteris... Relevant topic IP Address a logical address that identifies an interface or equipment on a network using IP protocol
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