What is Guided Transmission Media? How does it differ from Unguided Transmission Media? Give examples of both Guided and Unguided transmission media.

Guided transmission media and unguided transmission media are two fundamental categories of transmission media used in data communication and computer networks. These media play a critical role in determining the efficiency, speed, and reliability of data transmission between devices or systems.

Guided transmission media, also known as wired or bounded media, refers to transmission channels that use a physical path or conduit to transmit data signals. In guided media, electromagnetic signals are confined to a specific path such as a wire or cable. The transmission of data through guided media is more secure and less susceptible to interference because the physical medium protects the data from external noise. These media are often used in LANs (Local Area Networks), MANs (Metropolitan Area Networks), and structured cabling systems due to their ability to provide high-speed and reliable communication.

There are several types of guided transmission media, each with unique characteristics and specific use cases:

1. Twisted Pair Cable: This is the most commonly used guided medium in local area networks and telephone networks. It consists of pairs of insulated copper wires twisted together. The twisting reduces electromagnetic interference from external sources and crosstalk between adjacent pairs. Twisted pair cables are of two types: Unshielded Twisted Pair (UTP) and Shielded Twisted Pair (STP). UTP is used extensively in Ethernet networks, while STP is used in environments with higher interference.

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