Computer Networks Tutorial I

______________ is an error detection method in which a receiver can detect all single-bit errors in each codeword.

• Parity check

• Cyclic redundancy check

• Hamming code

• Redundancy check

State whether the following statements about checksum are True or False.

i. The checksum segment is sent along with the data segments.
ii. It can not detect any errors involving an even number of bits.

• i-True, ii-False

• i-True, ii-True

• i-False, ii-True

• i-False, ii-False

____________ is a form of spreading in which the center frequency of a conventional carrier is altered many times within a fixed time period.

• Time Hopping (TH)

• Direct Sequence (DS)

• Frequency Hopping (FH)

• Chrip

In ____________, the change or lack of change in the level of the voltage determines the value of the bit.

• NRZ-I

• NRZ-L

• Manchester

• Differential Manchester

Given a, 10-bit sequence 1010011110 and a divisor of 1011, find the CRC.

For the bit sequence 1011101011, draw the waveform for the following encoding techniques:

i) NRZ – L ii) Differential Manchester