pfSense can act as a LAN or WAN router. LAN, as you know, is basically a group of computers and associated devices that share a common communication line or wireless link to a server. A LAN usually consists of devices connected within a closed area, such as an office or a commercial establishment. A WAN is a geographically distributed private telecommunications network that interconnects multiple LANs. For example, in an organization, a WAN might connect multiple branch offices. A router is used to connect a LAN to a WAN.
LAN or WAN router
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