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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?
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What are the three types of guided media discussed in the text?
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What is the composition of twisted-pair cable?
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How is coaxial cable structured?
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What material is fiber optics cable made of?
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List three advantages of fiber optics cable over coaxial and twisted-pair cables.
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What is the main disadvantage of fiber optics cable?
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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.
