Unit 4 Assignment 1 Physical Layer

Unit 4 Assignment 1: Physical Layer Network Concepts
1. B and C
2. A and C
3. C and D
4. A and D
5. B
6. B
7. A and B
8. A
9. A
10. C
11. C
12. D
13. A and C
14. B
15. B
16. A
17. D
18. A and D
19. C
20. B, C and D
 Electrical Circuit – an electrical device that provides a path for electrical current to flow
 Frequency – The cycles per second of alternating current, measured in Hertz
 Amplitude – the maximum difference of an alternating electric current or potential from the average value
 Phrase – is a position of a point in time on a waveform cycle
 Bit time – the time it takes for one bit to be ejected from a network interface card at a standard speed
 Encoding Scheme – a system used by computers to represent data as characters
 Unshielded twisted-pair – The word unshielded refers to the fact that UTP cables have no added shielding materials to prevent EMI problems
 Core- The light source on one end of the cable shines light into the core
 Cladding- surrounds the core, for the entire length of the cable, and reflects the light into the core
 Radio waves- work well for networking because as a waveform, radio waves can be changed (modulated) over time to send data.
 Wireless WAN- used often in mobile phone network/mobile network
 Wireless LAN- don’t not use cables and do use radio waves to send data
 Access Point – all user devices communicate only through the AP, most WLAN’s use this wireless