Guided media
- Explain the term transmission medium
Physical path between the transmitter and the receiver that allows data communication between the two.
- What are the types of transmission medium?
- Guided transmission media
- Unguided transmission media
- How does guided media differ from unguided media?
A guided media is contained within physical boundaries whereas an unguided media is boundless.
- What are the three major classes of guided media?
- Fiber-optic cable
- Coaxial cable
- Twisted-pair cable
- What is a coaxial cable?
A type of cable used for computer network as well as cable television. It got this name as it contains two conductors that are parallel to each other or on the same axis.
- What does the term modem stand for?
It stands for modulator/demodulator
- What is the function of a modulator?
Embedding the information from the intelligent signal into the carrier signal by modifying some properties of the carrier signal in accordance to the intelligent signal
- What is the function of a demodulator?
Separation/Extraction of the intelligent message that was modulated into the carrier from the carrier itself.
- What is intelligent modem?
A modem that responds to commands and can accept new instructions during online transmission.
- What are the factors that affect data rate of a link?
- Type of encoding used
- Bandwidth of the medium
- For n devices in a network, what is the number of cable links necessary for mesh, ring, bus and star networks?
- Mesh topology: n(n-1)/2
- Ring topology: n-1
- Bus topology: one backbone and n drop lines
- Star topology: n
- What is data link?
Electronic connection of devices within a network for the exchange of information.
- What is the main function of the data link layer?
Transforming the Physical Layer to a reliable link; making it appear error-free to the upper layer(Network Layer).
- What is CSMA?
A network protocol that listens to or senses network signals on the carrier/medium before transmitting any data
- Explain CSMA/CD
A Medium Access Control that defines how network devices respond when two devices attempt to use a data channel simultaneously and encounter a data collision
- State advantage of Ethernet
- Easy to install
- it is cheap
- Supports various wiring techniques
- What is fast Ethernet?
Local Area Network transmission standard that provides a data rate of 100 megabits per second.
- What is bit stuffing and why is it need in HDLC?
Process of adding one extra 0 whenever there are five consecutive 1s in the data so that the receiver does not mistake the data for a flag
It is needed in HDLC to handle data frequency