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

Roaming and interconnect are where two operators, often with an IPX or GRX carrier in between, 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 WCDMA, Firewall, Satellite Backhaul, IGW, Inter-PLMN Security and MPLS.

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