Physical Media — Test 1

Correct Answer: C. C. Wireless LAN
Explanation: Wireless LAN is unguided media.

Correct Answer: A. A. Dsl
Explanation: Unshielded twisted pair(UTP) is commonly used in home access.

Correct Answer: B. B. 2
Explanation: Coaxial cable has an inner conductor surrounded by a insulating layer, which is surrounded by a conducting shield. Coaxial cable is used to carry high frequency signals with low losses.

Correct Answer: D. D. All of the mentioned
Explanation: In fibre optics the transmission of information is in the form of light or photons. Due to all above properties mentioned in options fibre optics can be submerged in water and are used at more risk environments.

Correct Answer: B. B. N*51.8
Explanation: The base unit of transmission rates in optical fibre is 51.8 Mbits/s. So an optical carrier represented as OC-n has n*51.8 Mbits/s transmission speed. For eg. OC-3 has 3*51.8 Mbits/s speed.

Correct Answer: B. B. 3
Explanation: The three types are those that operate over very short distance, those that operate in local areas, those that operate in the wide area.

Correct Answer: D. D. All of the mentioned
Explanation: Radio channels can penetrate walls, can be used to provide connectivity to mobile users and can also carry signals for long distances.

Correct Answer: A. A. Are placed at a fixed point above the earth
Explanation: They are placed in orbit at 36,000km above Earth’s surface.