Flow and Error Control Quiz

What are the main services provided by Data Link Control?

• Routing and switching

• Framing, flow control, error control

• Encryption and decryption

• Signal modulation

Data link control manages communication between:

• Devices across the internet

• Adjacent nodes

• Application-layer processes

• Routers only

Which formula gives the packet loss probability in terms of BER and packet length?

• p = BER × L

• p = (1 + BER)^L

• p = 1 − (1 − ɛ)^L

• p = L − BER

What does BER stand for?

• Bit Error Range

• Binary Error Repeat

• Bit Error Rate

• Broadcast Error Record

The term PER refers to:

• Protocol Efficiency Rate

• Packet Error Rate

• Partial Encoding Range

• Packet Exchange Relay

What is the relation between PER and BER?

• PER = BER × 1000

• PER = 1 − (1 − BER)^n

• PER = BER / Packet Size

• PER = BER^2

What does a high BER imply?

• Fewer retransmissions

• Better quality

• More packet errors

• No data corruption

In an ideal system, BER and PER are valid for which type of channel?

• Unidirectional channel

• Binary symmetric channel

• Multiplexed channel

• Asymmetric broadcast channel

Confidence level α is used to:

• Determine window size

• Compute bandwidth

• Validate PER tests

• Eliminate redundant bits

A system is valid if the number of erroneous packets is:

• Higher than M

• Equal to α

• Lower than M

• Always zero