Set 4: Data Link Layer

Which of the following is true with respect to the data link layer?

(A) It organizes data from the physical layer and passes these coherent messages directly to the application layer

(B) It performs error detection

(C) It accepts streams of bits from the application layer.

(D) It is responsible for encoding the bit-stream as a series of electronic voltages.

It performs error detection

_____ is NOT a function of a data link protocol.

(A) Media access control

(B) Error control

(C) Message delineation

(D) Frequency Modulation (FM)

Frequency Modulation (FM)

With contention media access:

(A) the controller must wait for a response from the polled client or terminal

(B) computers wait until the circuit is free before they send data

(C) there is never a chance for "collision," or two computers trying to send data at the same time (D) one computer starts the poll and passes it to the next computer on the multipoint circuit

computers wait until the circuit is free before they send data

The two sublayers of the data link layer consist of the media access control sublayer and the _____.

(A) common physical control sublayer

(B) logical link control sublayer

(C) network control sublayer

(D) logical session control sublayer

logical link control sublayer

Which of the following media is least susceptible to noise?

(A) radio

(B) Microwave

(C) coaxial cable

(D) fiber optic cable

fiber optic cable

Which of the following is NOT an error detection method used in the data link layer?

(A) checksum checking

(B) Pulse code checking

(C) Parity checking

(D) Cyclic redundancy checking

Pulse code checking

The data link layer uses the _____ to recognize the source and destination addresses.

(A) MAC address

(B) IP address

(C) switch

(D) router

MAC address

In the OSI model the data link layer sits directly between:

(A) The MAC and LLC layers

(B) the physical and the network layers

(C) the physical and the transport layers

(D) the network and transport layers

the physical and the network layers

Which of the following is a controlled access method of media access control?

(A) CSMA/CD

(B) Polling

(C) contention

(D) CSMA/CA

Polling

In general, controlled approaches:

(A) have many collisions.

(B) work better than contention approaches for large networks that have high usage.

(C) have slightly less collision than contention approaches

(D) do not require an active monitor to assign media access control.

work better than contention approaches for large networks that have high usage.