1. Name the two major categories of transmission media. - Guided Unguided media 2. How do guided media differ from unguided media? 3. What are the three major classes of guided media? 4. What is the function of the twisting in twisted-pair cable? The twisting is necessary to minimize electromagnetic radiation and resist external interference. It also helps to limit interference with other adjacent twisted pairs (cross-talk). In theory, the more twists per metre a cable has, the better the isolation 5. What is refraction? What is reflection? 6. What is the purpose of cladding in an optical fiber? The function of the cladding is to provide a lower refractive index at the core interface in order to cause reflection within the core so that light waves are transmitted through the fiber. 7. Name the advantages of optical fiber over twisted-pair and coaxial cable. 1. Greater Bandwidth 2. Faster Speeds 3. Longer Distances 4. Better Reliability 5. Thinner and Sturdier 6. More Flexibility for the Future 7. Lower Total Cost of Ownership 8. Describe the need for switching and define a switch. 9. List the three traditional switching methods. Which are the most common today? 10.What are the two approaches to packet switching?
