Term
| Why is coaxial cable not used for ring or star topologies? |
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Definition
| The ends of the cable must be terminated. |
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Term
| What are the components of a coaxial cable? |
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Definition
-Two concentric metalic conductors (inner conductor caries data, mesh grounds the cable).
- The insulator seperates inner conductor from the mesh ground.
- PVC sheath, cable encasement. |
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Term
| What are the advantages of coaxial cable? |
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Definition
-Highly resistant to EMI.
-Highly resistant to physical damage. |
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Term
| What are the disadvantages of coaxial cable? |
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Definition
| Expensive, inflexible construction, unsupported by new standards. |
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Term
| What are the four coaxial grades? Their purpose? Their rating resistance? |
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Definition
| RG-58 (10base2 Ethernet, thinnet--50ohms), RG-59 (Cable TV/Networking-75ohms), RG-6 (Satellite TV--75ohms, RG-8 (10base5 Ethernet, thicknet--50ohms), |
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Term
| What are the three types of coaxial cable connectors? |
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Definition
-F-Type (screw-on)
-BNC (push and twist)
-AUI (DB15) |
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Term
| What are the three components of Fiber Optic Cable? |
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Definition
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Term
| What are the advantages of Fiber Optics? |
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Definition
-Immune to EMI because it does not use electricity.
-Resists ease dropping.
-Supports very high data rates.
-Allows for greater cable distances. |
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Term
| What are the disadvantages of Fiber Optics? |
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Definition
-Expensive.
-Difficult to work with.
-Hard to install. |
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Term
| What are the types of fiber optic cable? |
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Definition
Single mode (single ray of light)
Multi mode |
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Term
| What is the diameter of single mode fiber? What are the advantages? |
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Definition
-10 microns.
-Data can be transmitted long distances (kilo meters). |
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Term
| What is the diameter of multi mode fiber? Describe its function? |
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Definition
| -50-100 microns (Multi ray transmission at different frequencies, cable lengths are limited). |
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Term
| What does the cladding do in multimode fiber transmission? |
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Definition
| It is created to reflect the rays at different angles to allow for multiple frequencies to be transmitted without interfearing with one another. |
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Term
| Types of fiber connectors? |
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Definition
-ST (SM & MM)
-SC (SM & MM)
-LC (SM & MM) plastic connector with locking mechanisim.
-MT RJ (SM & MM) plastic connector with uses tabs to ensure plug is aligned. |
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Term
| IEEE1394 is what cable specification |
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Definition
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Term
| Can you connect two computers though a USB port? |
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Definition
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Term
| How many versions of USB are there and what are their speeds? |
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Definition
-2
-USB1.0 12mbps
-USB2.0 480mbps |
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Term
| What is a mini-USB connector used for? |
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Definition
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Term
| What platform uses IEEE1394 for standard use? |
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Definition
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Term
| What are the two types of firewire ports? What is their speeds? |
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Definition
-4 wire (used for digital cameras)
-6 wire (used to connect PCs)
- 400mbps |
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Term
| Describe the USB A type connector. |
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Definition
-Plugs directly into computer or hub.
-Will connect two computers directly. |
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Term
| Describe the USB B type connector. |
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Definition
-Generaly plugs into a hub, printer, or other periphreal device to the computer.
-Most USB cables have an A connector on one end and a B connector on the other. |
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Term
| Describe the mini-USB type connector. |
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Definition
-Designed to plug into devices with mini plugs (digital cameras)
-Most mini-USB cables will have an A connector on the other side to plug into the PC |
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Term
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Definition
| Modern NICs have a transiever built in. They convert digital data to a physical signal |
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Term
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Definition
-Burned into ROM of every network device
-IEEE assignes vendors a 48 bit value
-Represented as a 12 digit HEX number |
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Term
| Hexidecimal numbers are Base __ numbers |
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Definition
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Term
Identify valid MAC addresses:
00-09-5B-36-C2-93
00-039-5B-3H-C2-93
00B0.D006.BCAC
0F-09-5B-56-C2-99 |
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Definition
00-09-5B-36-C2-93
0F-09-5B-56-C2-99
00B0.D006.BCAC |
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Term
| What does ISDN stand for? |
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Definition
| Intergrated Services Digital Network |
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Term
| ISDN uses what type of cabling? Where is it frequently used? |
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Definition
-Twisted pair copper wiring.
-Used mostly in europe |
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Term
| Describe how a NIC sends data across the network. |
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Definition
1. NIC RXs PCs data
2. NIC breaks data into frames and includes:
-Sending NICs MAC
-Recieving NICs MAC
-Data
-CRC check
3.NIC encodes the frames for transmission
4.Recieving NIC verifies NIC addresses and CRC.
5.Receiving NIC tracks frames and reassembles.
6. Receiving NIC sends data to PC |
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Term
| How is ISDN different from dial up technology? |
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Definition
| ISDN sends digital signals over a digital network, as opposed to analog. |
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Term
| WAPs use what to transmit data? |
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Definition
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