Which of the following is not a type of computer network?

Networks are named according to their purpose or geographic reach. A Virtual Private Network (VPN) creates a secure, encrypted connection over an existing network so a user can access a private network remotely. A Campus Area Network (CAN) links several buildings on one site. A Wireless Local Area Network (WLAN) is simply a LAN that uses wireless signals instead of cables to connect devices within a limited area.

There is no recognised network category called a DAN in standard computer networking classification. The established categories at this level are PAN, LAN, WLAN, CAN, MAN, WAN, and purpose-based networks such as VPN, but DAN does not appear among them.

Exam takeaway: when asked to spot the odd one out among network types, check each term against the recognised list (PAN, LAN, WLAN, CAN, MAN, WAN, VPN); an unfamiliar acronym that does not fit this list is the invented distractor.