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Transmission Media and Switching in Computer Networks

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Transmission Media and Switching in Computer Networks

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Questions and Answers

What is the difference between guided media and unguided media?

Guided media use physical conductors to transport signals, while unguided media transport electromagnetic waves without physical conductors.

What are the three major classes of guided media?

The three major classes of guided media are twisted pair cable, coaxial cable, and fiber optic cable.

Where does transmission media fit in the OSI model?

Transmission media is a part of the Physical Layer in the OSI model.

What is the significance of twisting in twisted pair cable?

Twisting in twisted pair cable helps reduce electromagnetic interference and crosstalk. Signup and view all the answers

What are the three types of guided media discussed in the text?

Twisted-pair cable, coaxial cable, fiber-optic cable Signup and view all the answers

What is the composition of twisted-pair cable?

Two conductors (normally copper) with plastic insulation twisted together Signup and view all the answers

How is coaxial cable structured?

Central core conductor of wire enclosed in insulating sheath, outer conductor of metal foil, all protected by a plastic cover Signup and view all the answers

What material is fiber optics cable made of?

Glass or plastic Signup and view all the answers

List three advantages of fiber optics cable over coaxial and twisted-pair cables.

Higher bandwidth, less signal attenuation, immunity to electromagnetic interference Signup and view all the answers

What is the main disadvantage of fiber optics cable?

Installation and maintenance cost Signup and view all the answers

Study Notes

Transmission Media

Transmission media is a component of the OSI model, fitting into the Physical Layer (Layer 1)

Guided Media vs. Unguided Media

Guided media use a physical medium to guide the signal, whereas unguided media transmit signals through air or space

Classes of Guided Media

The three major classes of guided media are:
- Twisted-pair cable
- Coaxial cable
- Fiber optics cable

Twisted-Pair Cable

Composition: two insulated copper wires twisted together to reduce electromagnetic interference
Significance of twisting: reduces electromagnetic interference and crosstalk

Coaxial Cable

Structured with a copper core surrounded by insulating material, a braided shield, and a plastic jacket

Fiber Optics Cable

Made of thin glass or plastic fibers that transmit data as light signals
Advantages over coaxial and twisted-pair cables:
- Higher bandwidth and data transfer rates
- Greater security due to difficulty in tapping
- Immunity to electromagnetic interference
Main disadvantage: expensive and difficult to install and maintain

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Description

Explore guided media, unguided media, wireless transmission, switching techniques like circuit-switched networks and packet switching, as well as the structure of a switch in computer networks. Referencing Chapter 2 of 'Computer Networks' by Andrew S. Tanenbaum.