1.

What is a Local Area Network?

A Local Area Network (LAN) is a computer network that serves a single building, office, or university. LANs are commonly used to link computers and other devices to share resources such as printers, files, and Internet access.
A LAN connects computers via a cable or wireless network, most often utilising Ethernet technology. LANs may be set up in a variety of methods, including client-server, peer-to-peer, and hybrid approaches.

  
 2. 

What is a Wide Area Network?

A Wide Area Network (WAN) is a computer network that spans a large geographic area, typically covering multiple cities, countries, or even continents. Unlike a Local Area Network (LAN), which is limited to a small geographic area, a WAN can connect computers and other devices across vast distances.

WANs are typically used to connect LANs together or to provide Internet access to remote locations. They can be implemented using a variety of technologies, such as leased lines, satellite links, or cellular networks.

WANs often use routers to connect different networks together and to manage the flow of data between them. They can also use advanced networking protocols and security measures to ensure that data is transmitted reliably and securely.

  
 3. 

What is a Network scalability?

Network scalability refers to the ability of a computer network to accommodate growth and increased demands over time. As a network grows, it must be able to handle more users, devices, and data traffic without experiencing performance degradation or service interruptions.

Scalability is an important consideration when designing and implementing a network, particularly for businesses and organizations that expect to expand or increase their usage over time. A scalable network should be able to accommodate additional users and devices, as well as higher levels of data traffic, without requiring major upgrades or causing significant downtime.