Multiple choice

Physical communication circuits are

  1. perfect

  2. not perfect

  3. both 1 and 2

  4. none of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Physical communication circuits are subject to various types of interference, noise, and signal attenuation, which can cause data errors. Because they are not perfect, network protocols must include mechanisms for error detection and correction to ensure reliable data transfer. This reality of physical media is why layers like the Data Link layer are essential.