Data Communication

Topics in this chapter

• Data Communication Fundamentals and Protocols
• Transmission Media and Signal Impairments
• Network Topologies and Architectures
• Networking Devices and Hardware
• Switching Techniques and Transmission Metrics

Cheat sheet

Practice questions

1. Question 1Q-553D56

   Which transmission mode allows communication in both directions, but only one direction at a time?

   1. A.Simplex
   2. B.Half-duplex
   3. C.Full-duplex
   4. D.Multiplex
   See the answer and solution
2. Question 2Q-9B0862

   A network device receives a weak digital signal, reconstructs it, and retransmits the regenerated signal without selecting a route for the data. Which device performs this function?

   1. A.Router
   2. B.Repeater
   3. C.Gateway
   4. D.Switch
   See the answer and solution
3. Question 3Q-EE875A

   Differentiate between circuit switching and packet switching. Mention one important advantage of packet switching.

   See the answer and solution
4. Question 4Q-926089

   What is the primary purpose of a communication protocol in a computer network?

   1. A.To define rules for exchanging data between devices
   2. B.To increase the physical size of a network
   3. C.To convert electrical energy into mechanical energy
   4. D.To permanently store transmitted data
   See the answer and solution
5. Question 5Q-C80D46

   A file containing 5 MB of data is transmitted over a channel with a data rate of 2 Mbps. Assuming 1 MB = 10^6 bytes and ignoring transmission overhead, how much time is required to transmit the file?

   1. A.2 seconds
   2. B.10 seconds
   3. C.20 seconds
   4. D.40 seconds
   See the answer and solution