Data Communication Networks Quiz

Which of the following is an error correcting code?

• Checksum

• Parity

• Cyclic redundancy check

• Hamming codes

What is the hamming distance between the words 1010101, 1100110?

• 4

• 5

• 8

• 3

The data link layer takes the packets from _________ and encapsulates them into frames for transmission.

• Network layer

• Physical layer

• Transport layer

• Application layer

Which of the following tasks is not done by data link layer?

• Framing

• Error control

• Flow control

• Channel coding

When 2 or more bits in a data unit has been changed during the transmission, the error is called ____________

• Random error

• Burst error

• Inverted error

• Double error

ARQ stands for _______.

• Automatic repeat quantization

• Automatic repeat request

• Automatic retransmission request

• Acknowledge repeat request

In the _____ Protocol, the sender sends one frame, stops until it receives confirmation from the receiver, and then sends the next frame.

• Stop-and-Wait

• Simplest

• Go-Back-N ARQ

• Selective-Repeat ARQ

Both Go-Back-N and Selective-Repeat Protocols use a _________

• Sliding frame

• Sliding window

• Sliding packet

• None of the above

Which multiple access technique is used by IEEE 802.11 standard for wireless LAN

• CDMA

• CSMA/CA

• ALOHA

• CSMA/CD

BSS is an abbreviation of?

• Base Service Set

• Base Service System

• Basic Service Set

• Basic System Set