A MAN network can span a city. They work in a restricted geographical area. Why We Need Computer Networks Need For Computer Networking Networks are the backbone of business today and are used for everything from retrieving the Internet or. . DCN - Digital Transmission. While there are fewer cables ran and the ability to support connection to smartphones and tablets a wireless LAN is often slower than a traditional LAN. Clientserver networks have centralized servers for storage which are accessed by client computers and devices. DCN - Computer Network Topologies. A computer network that operates in a small confined area such as a home school laboratory office or group of buildings. Here are a few of them. Wireless LAN uses a wireless signal rather than cables to support devices. They facilitate sharing of resources such as printers and storage media. 5 Common Types of Computer Networking. D