ACtE09 · Chapter 9AI & Neural Networks🏛️ Past Licensure QuestionID: 63461948
Which of the following tasks is not done by the data link layer?
Which of the following tasks is not done by the data link layer?
Multiple Choice Options
- A✓ Correct Option
Channel coding
- B
Framing
- C
Error control
- D
Flow control
Detailed Technical Solution & Explanation
Framing (delimiting bit streams into frames), error control (CRC / ARQ), and flow control (sliding window) are canonical functions of the Data Link Layer (OSI Layer 2). Channel coding (line coding, digital modulation, waveform shaping) is performed at the Physical Layer (Layer 1).
Option Analysis:
•
Option A (Channel coding): Correct. Performed by the Physical Layer to adapt digital bits for physical transmission media.
•
Option B (Framing): Primary Data Link Layer duty packaging network layer packets into frames.
•
Option C (Error control): Primary Data Link Layer duty detecting/correcting bit errors across nodes.
•
Option D (Flow control): Primary Data Link Layer duty preventing fast senders from overwhelming slow receivers.
Reference: Mock Test 04NEC Licensure Syllabus