- when its employees become distributed across many branch locations
- when the enterprise decides to secure its corporate LAN
- when the network will span multiple buildings
- when the number of employees exceeds the capacity of the LAN
Explanation: WANs cover a greater geographic area than LANs do, so having employees distributed across many locations would require the implementation of WAN technologies to connect those locations. Customers will access corporate web services via a public WAN that is implemented by a service provider, not by the enterprise itself. When employee numbers grow, the LAN has to expand as well. A WAN is not required unless the employees are in remote locations. LAN security is not related to the decision to implement a WAN.
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