There are two basic categories of physical cabling used in Ethernet networks. They are copper wire and fiber optic.
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True
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The length of cable between the wall jack and a patch panel is called vertical cabling.
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False
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Wireless and wired networks are both susceptible to RFI.
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True
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Because fiber-optic cabling uses light pulses instead of electrical signals, it is immune to interference and highly resistant to eavesdropping.
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True
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Wireless networks are often used to extend the reach of a wired LAN.
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True
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Which of the following is not one of the main differences between the types of network cabling?
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B. Ability to send/receive text
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Which of the following is not a form of electromagnetic interference, or EMI?
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A. rain/fog
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When a signal travels across network medium, it signal loses strength the further it gets from the transmitting station, to the point where the receiving station can no longer interpret the signals correctly. What is the term for this phenomenon?
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C. Attenuation
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What are all of the connections in a network considered, including the cables and their connectors?
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D. Cable Plant
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What is the maximum bandwidth for a network cabled using category 5e UTP cable?
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D. 1000 Mbps
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What is the maximum cable length for both category 5e and category 6 UTP cable?
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C. 100M
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The frequency at which a wireless network operates is measured in cycles per second and is expressed as what unit of measurement?
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A. Hertz
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Terrestrial and satellite systems are two types of which wireless networking technology?
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D. Microwave
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What is the way in which bit signals are represented on the network medium?
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B. Encoding
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Which of the following is a length of cable that connects a computer to either a networking device or to an RJ-45 jack?
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D. Patch Cable
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What is the term used that defines network cabling in the work area and between telecommunications closets and equipment rooms?
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B. Structured Cabling
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The entrance facility is the place where the connection to a WAN is located. It is basically the point where the LAN begins and ends. What is another name for this point?
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C. Demarcation Point
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A signal has just been received from the WAN link on your network. Using the given components, which of the following shows the path that the signal would take from the WAN to a workstation on your network? Assume all components are used at least once and that some components may be used more than once. (backbone cabling, entrance facility, equipment room, horizontal wiring, telecommunication closet, work area)
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B. 2, 1, 3, 1, 5, 4, 6
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Which of the following connections might require a crossover cable?
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C. Switch to Switch
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In an MDI device, on which two pins does the device use to transmit?
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A. 1 and 2
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What type of wiring should be used for a high-speed connection between two buildings?
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D. Fiber-optic cabling
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What is a disadvantage of using fiber-optic cabling?
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D. Difficult to install
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What type of wireless technology is used for 802.11b /g /n networks?
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A. Spread-spectrum radio
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Which of the following categories of UTP cabling are considered to be data grade as specified by ANSI/TIA/EIA? (Choose all that apply.)
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Category 4, 5 , 6
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Which of the following are components of a network that are defined by structured cabling?
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C. Horizontal wiring
D. Entrance facility
E. Work area
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A network that uses the air to transmit signals across the network is considered a(an) ____________ network.
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Wireless
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When copper wires are bundled together, they are susceptible to ____________, a form of interference where the signals leak out onto other wires.
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Crosstalk
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A type of wireless network that uses light beams to send signals between two devices and is highly susceptible to visible light sources is called ____________.
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Infrared
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A wireless ____________ using line-of-sight or broadcast transmissions can extend a wired network over a short distance that would normally require a dedicated communication line from a communications carrier.
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Bridge
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Most office buildings usually have a false ceiling with an area above that which is used to run conduit for heating and air conditioning units, called the ____________.
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Plenum
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used to connect two devices of the same type
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crossover cable
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caused by motors, transformers, and fluorescent lights
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electromagnetic interference
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connects a corporate network to third-party telecommunications provider
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entrance facilities
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interconnects telecommunications closets and equipment rooms
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backbone cabling
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both ends use the same wiring standard
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straight-through cable
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caused by strong broadcast sources
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radio frequency interference
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connects a patch panel port to a switch or hub
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patch cable
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runs from work area's jack to telecommunications closet
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horizontal wiring
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all the cables and connectors that tie a network together
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cable plant
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weakening of the signal as it travels
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attenuation
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Describe twisted-pair cabling.
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Twisted-pair cable is composed of small copper wires that are covered with an insulating material. Each wire is twisted with another, and this pair is color-coded—one being a solid color and the other being white with a stripe of the same solid color. One pair to four pairs of wires each of a different solid colors are bundled together and encased in an outer jacket.
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What are the advantages to using UTP in a network installation?
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UTP cabling is the least expensive and easiest type of cable to install. It takes little training, and the tools for installation are readily available and not terribly expensive. It is the most widely used, so it is always considered when new technology is being developed.
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What is the difference between a straight-through cable and a crossover cable?
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A straight-through cable is a patch cable that is made with the same wiring standard, either 586A or 586B, on both ends, so that the transmitting and receiving wires are the in the same position on both. On a crossover cable, one end of the cable uses one standard and the other end uses the other, thus crossing the transmitting and receiving wires.
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When would you use a straight-through cable and when would you use a crossover?
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A straight-through cable is used between a computer and a switch or hub and between a switch or hub and a router. A crossover cable is used between like devices, devices that transmit and receive on the same pins computer to router, computer to computer, or switch to switch.
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What are the benefits of fiber-optic cabling?
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Fiber-optic is capable of much higher bandwidths. Fiber-optic cabling is immune to EMI and RFI so it has no problem with interference. It also has no leakage so it is highly secure, almost impervious to eavesdropping. Because of low attenuation, fiber-optic cable can travel greater distances at a higher bandwidth.
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What five issues should you consider when determining the structure for a new network?
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1. the maximum bandwidth needed for the network
2. the budget you have to work with
3. the environment, electrical noise, or security issues
4. the distance between large spans on the network
5. compatibility with the network that is already in place
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Why is copper cabling susceptible to eavesdropping?
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When electric signals travel across copper wires, they create an electrical field that can be detected outside of the wires. Using the right equipment, this field can be intercepted and interpreted.
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What are the benefits of installing a wireless network?
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Wireless networks can be used to extend your network, whether you need a temporary connection, you need to span a greater distance than your existing network can handle, or you are not able to install wiring due to the type of building material. Wireless can be used as a backup solution. Wireless also allows users to roam
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What is a transceiver and what is its function?
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A transceiver is both a transmitter and receiver. A transceiver is needed to do two things: transmit and receive wireless signals and convert wireless signals to the correct wired equivalent, either electric or light.
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What is structured cabling and what are its six components?
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Structured cabling is a standard that specifies how cabling should be installed in a network. It is based on an extended star physical topology. It includes the work area, horizontal wiring, telecommunications closet, equipment rooms, backbone cabling, and entrance facilities.
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