| A | B |
|---|
| What is necessary for communication to occur? | A source, destination, and some sort of channel |
| What is a channel? | A path over which the information is sent |
| What are the two kinds of physical cables? | Metal cables – usually copper Fiber optic cables –made of glass or plastic |
| What type of copper cable does modern Ethernet technology use? | Twisted pair (TP) |
| Why are the wires twisted in twisted pair cabling? | To reduce interference |
| What cable type is used as a high-frequency transmission line to carry a high-frequency or broadband signal? | Coaxial |
| What type of cable is used in backbone networks, large enterprise environments and large data centers? | Fiber optic |
| What do twisted pair cables use to transmit data? | Pulses of electricity |
| What source of interference occurs when cables are bundled together for long lengths? | Crosstalk |
| In twisted pair cabling, what do the number of twists per unit length affect? | The amount of resistance the cable has to interference |
| What are the three types of twisted pair cable? | Unshielded twisted pair, shielded twisted pair, and screened twisted pair |
| Which type of cable is inexpensive, offers a high bandwidth, and is easy to install? | UTP |
| What category of cable is used for voice communication, ie telephone lines? | Cat 3 |
| What is the most commonly used cable type in network environments? | Cat 5, 5e, and 6 |
| How are all categories of data grade UTP terminated? | RJ-45 |
| What is the advantage of coax over UTP? | It has improved shielding, has a lower signal-to-noise ratio, can carry more data |
| How do fiber optic cables transmit data? | Pulses of light |
| What are some advantages of fiber over twisted pair and coax? | Immune to EMI, supports a large amount of bandwidth |
| How many fiber cables are in each fiber optic circuit? | Two – one to transmit; one to receive |
| What are the two forms of fiber optic? | Multimode and single mode |
