Data-link Control & Protocols
1. In a Go-Back-N ARQ, if the window size is 63, what is the range of sequence numbers?
A.  0 to 63 B.  0 to 64 C.  1 to 63 D.  1 to 64
2. In Go-Back-N ARQ, if frames 4, 5, and 6 are received successfully, the receiver may send an ACK _______ to the sender.
A.  5 B.  6 C.  7 D.  any of the above
3. ARQ stands for _______.
A.  Automatic repeat quantization B.  Automatic repeat request C.  Automatic retransmission request D.  Acknowledge repeat request
4. For Stop-and-Wait ARQ, for 10 data packets sent, _______ acknowledgments are needed
A.  exactly 10 B.  less than 10 C.  more than 10 D.  none of the above
5. HDLC is an acronym for _______
A.  High-duplex line communication B.  High-level data link control C.  Half-duplex digital link combination D.  Host double-level circuit
6. Data link control deals with the design and procedures for ______ communication
A.  node-to-node B.  host-to-host C.  process-to-process D.  none of the above
7. ______ in the data link layer separates a message from one source to a destination, or from other messages going from other sources to other destinations
A.  Digitizing B.  Controlling C.  Framing D.  none of the above
8. In _______ framing, there is no need for defining the boundaries of frames.
A.  fixed-size B.  variable-size C.  standard D.  none of the above
9. In ________ framing, we need a delimiter (flag) to define the boundary of two frames.
A.  fixed-size B.  variable-size C.  standard D.  none of the above
10. . _________framing uses two categories of protocols: character-oriented and bit-oriented.
A.  Fixed-size B.  Variable-size C.  Standard D.  None of the above