JNTU B.Tech III PRINCIPLES OF COMPUTER COMMUNICATIONS AND NETWORKS Previous Question Paper (February/March - 2022 - R16)

Computer communication refers to the process of transferring data between two or more computing devices via a transmission medium. It involves the exchange of information in the form of digital signals, enabling resource sharing, remote access, and distributed processing. The fundamental components of a communication system include the source, transmitter, transmission system, receiver, and destination.

Key aspects include:

• Data Representation: The format in which information is encoded, such as text, audio, video, or images.
• Transmission Modes: The direction of data flow, which can be simplex (one-way), half-duplex (two-way but not simultaneous), or full-duplex (simultaneous two-way).
• Protocols: A set of rules governing the exchange of data, ensuring that both sender and receiver interpret the signals identically.
• Network Topology: The physical or logical arrangement of the network nodes and connections.

Computer networks are categorized primarily based on their geographical scale and the scope of their connectivity:

• Local Area Network (LAN): Designed for small geographical areas like a single office, building, or campus. They offer high data transfer rates and are typically owned and managed by a single organization.
• Metropolitan Area Network (MAN): Covers a larger area, such as an entire city. It often acts as a high-speed backbone connecting multiple LANs within a municipal region, frequently utilizing fiber-optic infrastructure.
• Wide Area Network (WAN): Spans a broad geographical area, such as a country, continent, or the entire globe. WANs use leased telecommunication lines, satellites, or radio links to connect smaller networks (LANs and MANs). The Internet is the most prominent example of a global WAN.
• Personal Area Network (PAN): A very small-scale network centered around an individual's workspace, typically connecting devices like smartphones, laptops, and tablets via technologies such as Bluetooth or USB.
• Wireless Local Area Network (WLAN): A LAN that uses wireless technology, such as Wi-Fi, instead of physical cables to connect devices within a limited range.