WAN (Wide Area Network)

A Wide Area Network connects sites across regional, national, or global distances, typically using leased lines, MPLS, IPsec VPNs over the internet, or SD-WAN. Operator backbones, enterprise multi-site networks, and cloud interconnects are all WANs. WAN security depends on transport encryption, authentication of peers, and consistent policy enforcement across sites.

Categories: Radio Access NetworkRoaming and InterconnectSecurity Controls

WAN in context

The radio access network is where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations and downgrade attacks; defenses rest on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

Roaming and interconnect are where two operators exchange signaling and user-plane traffic. Trust boundaries here are the primary attack surface for location tracking, SMS interception and fraud, which is why GSMA now mandates SEPP with PRINS on 5G interconnect.

To place WAN in the wider telecom-security picture, review 1G, 2G, 6G, A5/0, AKA and AP — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

More from the TelcoSec Glossary

Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.