Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
60 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
What is coaxial? |
Older style of network cabling, where conductors are around a central axis - CATV cabling, e.g. |
Cabling |
|
|
What are the different types of coaxial connectors? |
-Vampire tap (RG8 cable) -BNC (twist connection - RG58 cable) -T (to connect to a computer - RG58 cable) -Terminator (required at each end of a daisychain - RG58 cable) -F (screw-in - RG6/CATV cable) |
Five types |
|
|
What are the different types of coaxial cables and their impedances? |
-RG8 (Thicknet, 50 Ohm) -RG58 (Thinnet, 50 Ohm) -RG6, (CATV, 75 Ohm) |
Three types |
|
|
What is UTP cable? |
Unshielded Twisted Pair. A type of network cabling with pairs of twisted wires. Usually four pairs, but can be two (telephony). |
Cabling |
|
|
What is STP cable? |
Shielded Twisted Pair. Similar to UTP (network cabling with pairs of twisted wires), with a foil shield around all, just inside the outer sheath. Used to avoid radio interference. |
Cabling |
|
|
What are the most-used twisted-pair cable categories (CAT) and their speeds? |
-CAT 3, 10 megabits/sec -CAT 5, 100 megabits/sec -CAT 5e, 100 megabits/sec (improved on CAT 5) -CAT 6, 10 gigabits/sec -CAT 6a, 10 gigabits/sec |
Five types |
|
|
What are the types of twisted-pair connectors? |
-RJ11 (mostly telephony) -RJ45 (mostly computer networking) |
Two types |
|
|
What are the types of cable fire ratings? |
-PVC (Polyvinyl Chloride, least cost and fire retardant) -Riser (better fire retardant) -Plenum (very fire retardant) |
Three types |
|
|
What are the types of fiber-optic cabling and their uses? |
-Multimode, used to transmit LED light (usually orange) -Single-mode, used to transmit laser light, longer distances than multimode (usually yellow) |
Two types |
|
|
What are the different types of fiber-optic connectors? |
Older types - single: -ST, similar to BNC (twist) -SC, square, simple connector -FC, similar to ST, but screw-in Newer types - duplex: -LC connector, square, w/clips -MTRJ, more compact than LC |
Five types, two categories |
|
|
What are the types of polish connectors for fiber-optic terminals, by efficiency? |
-PC (polish conector), flat end, least efficient -UPC (ultra polish connector), fully rounded tip -APC (angled polish connector), angled tip, most efficient |
Three types |
|
|
What's the difference between 10Base5 and 10Broad5? |
Base is single-channel, often used in networks. Broad is multi-channel, similar to cable TV usage. |
|
|
|
What are the meanings of the individual terms in 10BaseT? |
-10 is the network speed, usually between 10 and 1000 mbps (sometimes 10 gbps) -Base is channel definition -T is the length of the run. (Originally 5 (500 meters), but now defaults to T) |
|
|
|
What is Segmented Ethernet? |
No switches or hubs. One cable run, with all individual computers connected to that single cable. |
Older network architecture |
|
|
What is CSMA/CD? |
Carrier Sense Multiple Access/Collision Detection. Architecture to avoid data collision, or multiple simultaneous transmissions. |
|
|
|
Which cable types require terminating resistors and why? |
10Base5 (Thicknet) and 10Base2 (Thinnet). Keeps network signal from bouncing off the end of the cable run. |
|
|
|
What is special about 10Base2 computer connectors? |
They require T-connectors. (10Base5 uses vampire taps at the coaxial cable). |
|
|
|
What are the limitations/requirements of 10BaseT? |
-10 megabits per second -Max 100 meters between switch/hub and node (client) -Max 1024 nodes per switch/hub -CAT 3 UTP cable or better |
Speed, distance, nodes, cable |
|
|
What are the limitations/requirements of 100BaseT (a.k.a. 100BaseTX)? |
-100 megabits per second
-Max 100 meters between switch/hub and node (client) -Max 1024 nodes per switch/hub -CAT 5e UTP cable or better |
Speed, distance, nodes, cable |
|
|
What are the limitations/requirements of 100BaseF (a.k.a. 100BaseFX)?
|
-Max 2 kilometers between switch/hub and node (client) -Max 1024 nodes per switch/hub -Multimode fiber-optic |
Speed, distance, nodes, cable |
|
|
What is the difference between a hub and a switch? |
A hub broadcasts to all nodes; a switch broadcasts only to the required node(s) by using MAC addresses. Switches allow full-bandwidth conversations. |
Broadcast style |
|
|
What's the difference between full- and half-duplex? |
Full-duplex allows two-way communication; half-duplex is one-way only - only one node can send at a time. Half-duplex is required for simple, two-node, direct-connect networks (crossover cable req'd). |
Conversation style |
|
|
What are the two types of twisted-pair cable ends (wiring types) and their uses? |
TIA 568-A and TIA 568-B TIA-568-B is only used on one end of a crossover cable. |
TIA |
|
|
What is a crossover cable and its use? |
Wired differently on each end (TIA 568-A and -B) - send to receive and vice-versa. Used to connect old (non-intelligent) switches/hubs, or directly connecting two computers. |
Old cable style |
|
|
Why are crossover cables no longer required? |
First, hubs & routers had a dedicated uplink port. Later hubs/switches have auto-sensing ports, which check for cable type and self-configure. |
|
|
|
What are the limitations/requirements of 1000BaseCX?
|
-1000 megabits per second
-Max 25 meters between switch/hub and node (client) -Twinax cable or better |
Speed, distance, cable
|
|
|
What are the limitations/requirements of 1000BaseSX? |
-1000 megabits per second -Max 500 meters between switch/hub and node (client) -Multimode fiber-optic |
Speed, distance, cable |
|
|
What are the limitations/requirements of 1000BaseLX? |
-1000 megabits per second
-Max 5 kilometers between switch/hub and node (client) -Single-mode fiber-optic |
Speed, distance, cable |
|
|
What are the limitations/requirements of 1000BaseT? |
-1000 megabits per second -Max 100 meters between switch/hub and node (client) -CAT 6 UTP cable or better |
Speed, distance, cable |
|
|
What is strange about the limitations/requirements of 10 GbE (Gigabit Ethernet)?
|
Originally designed to work with SONET, the backbone of the Internet; but can be used with LANs. |
Standards defined by network types |
|
|
What are the limitations/requirements of 1GBaseT?
|
-10 gigabitsbits per second
-Distance defined by cable used -CAT 6 UTP (55 m limitation) -CAT 6 UTP (100 m limitation) |
Speed, distance, cable |
|
|
What are the limitations/requirements of 1GBaseSR?
|
-10 gigabits per second
-26-400 meters, depending on type of cable -Multimode fiber-optic |
Speed, distance, cable |
|
|
What are the limitations/requirements of 1GBaseLR (Long Range)? |
-10 gigabits per second -10 kilometers -1310 nm single-mode fiber-optic |
Speed, distance, cable
|
|
|
What are the limitations/requirements of 1GBaseER? |
-10 gigabits per second -40 kilometers -1550 nm single-mode fiber-optic |
Speed, distance, cable |
|
|
What's the difference between 1GBaseER and 10GBaseEW (plus, by extension, 1GBaseSR/SW and 1GBaseLR/LW)? |
The R designation is LAN; the W designation is SONET. Otherwise, the limitations/requirements are identical. |
Speed, distance, cable |
|
|
What is a GBIC? |
Gigabit Interface Converter. A device used to allow different network types of fiber-optic to connect to a switch without replacing the switch. |
Network connector |
|
|
What is a Bridge Loop (a.k.a. Bloop)? |
Wiring a set of two or three switches together, interconnected. To be avoided. (Can also be done by looping a network cable to the same switch.) |
Bad news |
|
|
What is Spanning Tree Protocol (STP)? |
Switch protocol that automatically avoids Bridge Loops. Not available on non-intelligent switches. |
Bridge Loops |
|
|
What is Structured Cabling, and what are its components? |
Cable organization system. 1. Switch closet 2. Horizontal runs 3. Work area |
Physical system |
|
|
What is the purpose of the switch closet? |
Holds switches and patch panel. Horizontal runs terminate at patch panel; patch cables run between patch panel and switch. |
Network |
|
|
What's the difference between horizontal cables and patch cables? |
Horizontal cables are solid-core; patch cables are stranded core. Stranded wire tolerates flexing. |
Flexing |
|
|
What components are in the work area? |
Wall port and patch cable |
Desk area |
|
|
What is the main difference between TIA 568-A and 568-B? |
Wires 1 and 2 on one end terminate at 3 and 6 on the other end. Otherwise, all wires match. |
Wire crossings |
|
|
What is the wiring standard for TIA 568-A? |
1 Green/White 2 Green 3 Orange/White 4 Blue 5 Blue/White 6 Orange 7 Brown/White 8 Brown |
Alpha |
|
|
What is the wiring standard for TIA 568-B? |
1 Orange/White 2 Orange 3 Green/White 4 Blue 5 Blue/White 6 Green 7 Brown/White 8 Brown |
Non-alpha |
|
|
What tool is used to terminate twisted-pair patch cables? |
Crimper |
|
|
|
What tool is used to terminate horizontal cables at the patch panel and wall port? |
110 punch down tool |
|
|
|
What is a Main Distribution Frame (MDF)? |
Primary equipment room in a network, often with connections to the Internet. |
|
|
|
What is an Intermediate Distribution Frame (IDF)? |
Secondary equipment room, between the MDF and nodes. (Not always used.) |
|
|
|
What's the standard width of an equipment rack? |
19 inches |
|
|
|
What is a 'U' in relation to equipment racks? |
A standardized measurement of component height, or 1.75 inches. |
|
|
|
What do the terms Demarc and Demarc Extension mean? |
Demarc = Demarcation - A connection between your equipment and the ISP. Demarc Extension - an extension of a Demarc, used in multi-tenant properties. |
Interface |
|
|
What is Wiremap? |
The correct mapping of wires between terminals |
|
|
|
What is continuity? |
The reliability of the connection of individual wires between terminals |
|
|
|
What is the purpose of a Time Domain Reflectometer (TDR) or Optical TDR? |
It measures the distance of a cable, especially for horizontal cables. Can be used to pinpoint cable breaks. |
|
|
|
What are the initial steps for troubleshooting network connectivity issues? |
-Check link lights on workstation and patch panel -Check network settings in the OS -Verify device driver -Test with loopback (archaic) -Check patch cables -Check the wall port |
|
|
|
What is a loopback adapter? |
An RJ45 jack with the following pins connected in a loopback: Pin 1 - pin 3 Pin 2 - pin 6 Most modern network cards will not recognize a loopback. |
Pinouts |
|
|
What are some common advanced network troubleshooting tools? |
-Voltmeter (momentary test) -Voltage monitor (time test) -Environment monitors -Time Domain Reflectometer -Intermittent causes - motors, e.g. |
|
|
|
What is Modal Distortion? |
Multimode fiber-optic only, where the light is distorted during transmission. (Single-mode is not affected.) |
|
|
|
What is a tone generator/probe tool? |
Used to quickly trace a wire to its terminus |
|
