Data and Digital Communications Quiz

What is data communications?

• The exchange of images between two devices via some form of transmission medium

• The exchange of data between two devices via some form of transmission medium

• The exchange of voice between two devices via some form of transmission medium

• The exchange of video between two devices via some form of transmission medium

Who invented the first successful data communications system using binary-coded electrical signals?

• Carl Friedrich Gauss

• Alexander Graham Bell

• Samuel F. B. Morse

• Guglielmo Marconi

What is the name of the first practical data communications code developed by Samuel F. B. Morse?

• Morse Code

• ASCII Code

• Baudot Code

• EBCDIC Code

Which topology is the simplest, most common, and fastest network topology?

• Star Topology

• Ring Topology

• Mesh Topology

• Bus Topology

What is the highest layer in the OSI model?

• Physical Layer

• Transport Layer

• Application Layer

• Data Link Layer

Which error detection scheme uses a checksum to determine if a transmission error has occurred?

• Cyclic Redundancy Check (CRC)

• Checksum

• Parity

• Redundancy Checking

Which error correction scheme is used for correcting transmission errors without retransmission of the entire message?

• Symbol Substitution

• Hamming Codes

• Retransmission

• Forward Error Correction (FEC)

What is the purpose of FEC code in error correction?

• To identify errors in the Hamming bits

• To eliminate the time wasted for retransmission

• To increase the length of a transmission

• To detect and correct multiple errors

What is the limitation of Hamming Codes in error correction?

• It can correct only single bit errors

• It can correct multiple errors or burst errors

• It does not require the addition of overhead to the message

• It can identify errors in the Hamming bits themselves

How many Hamming bits are required for a block length of 20 message bits?

• 15

• 10

• 5

• 8