6. Noiseless channels are ideal for data transmission because:
a) They have high error rates
b) They have low error rates
c) They don't support data transmission
d) They are highly congested

7. Which phase of PPP is responsible for establishing and terminating connections?
a) Framing
b) Transition
c) Checksum
d) Error correction

8. Which of the following is an example of a cyclic code?
a) Parity bit
b) Hamming code
c) CRC
d) Checksum

9. What is the primary purpose of flow control in the data link layer?
a) Regulating data transmission rate
b) Detecting errors
c) Framing data
d) Establishing connections

10. What do protocols in the data link layer define?

a) Physical connections
b) Data transmission rates
c) Rules for communication
d) Error correction techniques