Title: Module Three Quiz
Course: CNT 2001 Computer Networks & Communications > Section: Module 3 Media

Q: Twisted-pair cables are twisted to reduce _________.
- attenuation
- crosstalk
- feeder traffic
- random feedback
A: crosstalk
If right: Many people wonder is why the cable is called “twisted” pair. When electromagnetic signals are conducted on copper wires in close proximity, the signals begin to interfere with each other. This interference, known as crosstalk, can be minimized by twisting two wires together as a pair.

Q: What type of connector would you find on a UTP cable used on an Ethernet network?
- RJ-11
- RJ-45
- RJ-22
- RG-50
A: RJ-45
If right: To fit a connector to UTP wiring it is necessary to use a Registered Jack (RJ) connector. RJ-45 connectors which are used in Ethernet data networks uses four pairs (eight wires) and is usually associated with Category 3 or higher UTP wires.

Q: What is the minimum category used for Ethernet networks that is rated at 250MHz and is the preferred standard for Gigabit Ethernet?
- Cat 3
- Cat 5
- Cat 5e
- Cat 6
A: Cat 6
If right: Category 6 wiring consists of four twisted wire pairs (eight wires) and is rated for 250MHz. Category 6 became a standard in June 2002. In many applications, Category 6 wiring is replacing older category standards and is the preferred standard for Gigabit Ethernet.

Q: What is the minimum category used for Ethernet networks that run up to 100 Mbps worth of data up to a distance of 100 meters?
- Cat 1
- Cat 3
- Cat 5
- Cat 5e
A: Cat 5
If right: Category 5 consists of four twisted wire pairs (eight wires) and is rated for 100MHz. This category was very popular until the appearance of Category 5e wire. Now Category 5e wire is preferred because it is the same price as Category 5 wire but has better capabilities. Category 5 wire can carry 100 Mbps worth of data 100 meters.

Q: What cable is used to connect a host computer to a switch?
- straight-through cable
- crossover cable
- rollover cable
- hardware loopback
A: straight-through cable
If right: Straight-through cable is used to connect a host to a switch or hub, or a router to a switch or hub. One way to remember this is to consider that straight-through cables are used to connect devices with dissimilar functions, whereas crossover cables are used to connect devices with similar functions.

Q: What minimum category used for Ethernet networks is rated at 100MHz and can handle the interference that comes from being able to transmit on all four pairs of wires at the same time?
- Cat 3
- Cat 5
- Cat 5e
- Cat 6
A: Cat 6
If right: Similar to Category 5 wire, Category 5e wire consists of four twisted pairs (eight wires) and is rated for 100MHz. The enhanced power comes from its capability of handling the interference that comes from being able to transmit on all four pairs of wires at the same time, instead of just the two pairs that CAT 5 and previous CAT cables use. This feature is needed for Gigabit Ethernet but is more commonly used to run Voice over Internet Protocol (VoIP) and data on the same cable.

Q: How many pairs of wires does a UTP cable have on an Ethernet network?
- 1
- 2
- 3
- 4
A: 4
If right: RJ-45 connectors, used on Ethernet data networks, use four pairs (eight wires) and are usually associated with Category 3 or higher UTP wires.

Q: Which type of connector would you find on a UTP cable used on a telephone?
- RJ-11
- RJ-45
- RJ-22
- RG-50
A: RJ-11
If right: Use a registered jack (RJ) connector to connect to UTP wiring. RJ-11 is the connector type used to connect a phone to a phone jack. This connector is used with UTP cable similar to Category 1 cable and uses two pairs (four wires).

Q: What is the minimum category used for Ethernet networks that run up to 10 Mbps?
- Cat 1
- Cat 2
- Cat 3
- Cat 5
A: Cat 3
If right: Category 3 cabling consists of four twisted wire pairs (eight wires) with three twists per foot. This type can handle transmissions up to 16MHz. It was popular in the mid-1980s for up to 10Mbps Ethernet.

Q: How many pairs of wire does a UTP cable have on an analog telephone cable?
- 1
- 2
- 3
- 4
A: 2
If right: The RJ-11 connector is used with UTP cable similar to Category 1 cable and uses two pairs (four wires). A telephone cable requires an RJ-11 connector.

Q: Which type of shield contains a center conductor made of copper surrounded by a plastic jacket, which then has a braided shield over it?
- shielded twisted-pair cable
- unshielded twisted-pair cable
- coaxial cable
- fiber-optic cable
A: coaxial cable
If right: Coaxial cable, referred to as coax, contains a center conductor made of copper that is surrounded by a plastic jacket. The plastic jacket then has a braided shield over it. A plastic such as PVC or Teflon covers this metal shield.

Q: What type of cable was popular on IBM token ring networks?
- shielded twisted-pair cable
- unshielded twisted-pair cable
- coaxial cable
- fiber-optic cable
A: shielded twisted-pair cable
If right: STP wiring works the same way as UTP, but adds shielding to the cable. STP cable looks just like UTP cable, except that STP cable adds extra shielding around each pair of wires in the cable.

Q: Which of the following cable is used for cable television and modems?
- RG-58 U
- RG-8
- RG-59
- RG-6
A: RG-6
If right: Radio guide (RG) cables such as RG-6 and RG-59 are part of an old and now obsolete military standard. However, although RG cables are not often used in military applications any more, RG-6 is still widely used in civilian applications. The largest civilian application of RG-6 cable is in the cable TV industry, including cable modems.

Q: Which type of cable is designed to release no or little toxic gases when burned?
- plenum-rated cable
- slow-burn cable
- biodegradable cable
- organic cable
A: plenum-rated cable
If right: Teflon-type covering is frequently referred to as a plenum-rated coating. This coating is expensive, however. Many municipalities require plenum-rated cable coatings for cable hidden in walls and ceilings because if a building catches fire, its plenum-rated cable will not release toxic gases.

Q: What type of cable do you traditionally use to connect a switch to another switch?
- straight-through cable
- crossover cable
- rollover cable
- hardware loopback
A: crossover cable
If right: Crossover cables can be used to connect these devices: switch to switch, hub to hub, host to host, hub to switch, and router direct to host.

Q: What cable is used to connect a computer to another computer?
- straight-through cable
- crossover cable
- rollover cable
- hardware loopback
A: crossover cable
If right: The same four wires used in straight-through cable are also used in crossover cable, just with the wires arranged differently. You can use crossover cables to connect these devices: switch to switch, hub to hub, host to host, hub to switch, and router direct to host.

Q: What type of cable or device would you use to redirect the data flow back onto itself?
- straight-through cable
- crossover cable
- rollover cable
- hardware loopback
A: hardware loopback
If right: A hardware loopback redirects data flow. Sometimes you need to make a computer think it has a live connection to a network when such a connection in reality does not existfor example, if you need to test a computer or because you need a live network connection to install a piece of software. In these cases, the loopback can trick the PC into seeing its own output as input.

Q: What type of cable would you use to connect your PC to a router’s console port?
- straight-through cable
- crossover cable
- rollover cable
- hardware loopback
A: rollover cable
If right: Rollover cables are not used to hook Ethernet connections together, but they are used to connect a host to a routers console port. A WAN engineer uses a console port to program or configure a router. Switches have a similar port used for the same purpose.

Q: Which serial connection technology allows up to 127 external devices found on today’s PCs?
- RS-232
- USB
- parallel
- RS-1432
A: USB
If right: Universal Serial Bus (USB) is now the default built-in serial bus for most motherboards. Whereas most computer manufacturers include four to eight and occasionally more USB ports on their computers, USB can actually support up to 127 external devices.

Q: What is the maximum speed for USB 2.0?
- 1.5 Mbps
- 12 Mbps
- 480 Mbps
- 4.8 Gbps
A: 480 Mbps
If right: Released in 2000, USB 2.0 has a maximum data rate of 480 Mbps and a maximum cable length of 5 meters. USB 2.0 is also known as high-speed USB. More recently, USB 3.0 was released which supports up to 3.2 Mbps.

Q: 10Base-2 is also known as ________.
- Thicknet
- Thinnet
- Bricklet
- Arcnet
A: Thinnet
If right: Thin Ethernet, also referred to as Thinnet or 10Base-2, is a thin coaxial cable. It is basically the same as thick coaxial cable except it is only about 1/4 inch in diameter. Thin Ethernet coaxial cable is RG-58.

Q: What is legacy serial connection usually found on older computers often used to connect a modem?
- RS-232
- USB
- parallel
- RS-1432
A: RS-232
If right: Recommended Standard 232 (RS-232) is used for serial data cables connecting data-terminal equipment and data-communications equipment. A familiar example of this would be using a computers serial port to connect to an external modem.

Q: What is a form of EMI that results from two improperly shielded copper wires running too close together?
- crosstalk
- conductivity
- attenuation
- tangibility
A: crosstalk
If right: Crosstalk is a form of EMI that results from two improperly shielded copper wires running too close together. Crosstalk results when the signal carried in one wire bleeds over to the other wire so that both signals are carried on the same wire, resulting in both signals being degraded.

Q: What type of cabling is immune to EMI?
- STP
- UTP
- coaxial
- fiber Optic
A: fiber Optic
If right: The best way to solve the various problems caused by electricity flowing through copper wires is to not use copper wires at all. Instead, fiber-optic cables, which are immune to EMI, can be used in place of copper. However, using fiber-optic cables is often not an option because of the expense.

Q: What disturbance affects an electrical circuit due to either electromagnetic conduction or electromagnetic radiation emitted from an external source?
- noise
- leakage
- radio modulation
- serial modulation
A: noise
If right: Anytime electrons are pushed through two wires next to each other, it creates a magnetic field. Magnetic fields produced in this way result in noise. Anything that interferes with the transmission of information in a given environment is considered noise.

Q: What is a limitation of electrical signals that eventually distorts itself over a distance?
- crosstalk
- conductivity
- attenuation
- tangibility
A: attenuation
If right: One problem that can result from this type of interference is limiting the distance a copper cable can be run before the cable’s signal weakens to the point it is no longer readable. This problem is called attenuation.

Q: Which type of fiber-optic cable uses light that is dispersed on numerous paths as it travels through the core and is reflected back?
- multimode fiber-optic cable
- single-mode fiber-optic cable
- single-stranded twisted pair
- single-stranded LED
A: multimode fiber-optic cable
If right: Multimode fiber-optic cable (MMF) uses light to communicate a signal, but with it, the light is dispersed on numerous paths as it travels through the core and is reflected back. A special material called cladding lines the core and focuses the light back onto it. MMF provides high bandwidth at high speeds over medium distances (up to about 3,000 feet), but beyond that the signal begins to degrade.

Q: Which of these fiber-optic connectors is widely used and uses a BNC-style attachment mechanism?
- SC
- ST
- MT-RJ
- LC
A: ST
If right: The ST fiber-optic connector (developed by ATT) is one of the most widely used. It uses a BNC-style attachment mechanism similar to Thinnet that makes connections and disconnections fairly frustration-free.

Q: What do you call the time it takes for a signal to travel a distance, causing a delay?
- throughput cap
- modulation delay
- throughput delay
- latency
A: latency
If right: Although electromagnetic signals travel at the speed of light, they nevertheless develop a noticeable latency over long distances.

Q: Which type of fiber-optic cable is a very high-speed, long-distance media that consists of a single strand that carries the signals?
- multimode fiber-optic cable
- single-mode fiber-optic cable
- single-stranded twisted pair
- single-stranded LED
A: single-mode fiber-optic cable
If right: Single-mode fiber-optic cable (SMF) is a very high-speed, long-distance media that consists of a single strandsometimes two strandsof fiberglass that carries the signals. Lasers are the primary light sources used with SMF.

Q: The __________ is the last point of responsibility of the service provider.
A: demarc
If right: The demarc (short for demarcation point) is the service provider’s last point of responsibility. It is often at the MDF in your building connection (if your building is large), but it is usually just an RJ-45 jack that your channel service unit/data service unit (CSU/DSU) connects into from your router to WAN connections.

Q: The __________ are backbone cable connects equipment rooms, telecommunications rooms, and other physical termination points.
A: vertical connect cables
If right: Backbone cables that connect equipment rooms, telecommunications rooms, and other physical termination points are referred to as vertical connect cables. This name came about because these cables often go from floor to floor in a building.

Q: When using UTP cables for the horizontal connect cables, the cable should not exceed ____ meters.
A: 100
If right: When using UTP cables for the horizontal connect cables, the cable should not exceed 100 meters. These 100 meters includes the entire distance from the switch all the way to the computer at the other end. The length of any patch cables used to connect the computers is included in the 100-meter length.

Q: The space between floors is referred to as the __________.
A: plenum
If right: Many large multi-story buildings are designed to circulate air through the spaces between the ceiling of one story and the floor of the next; this space between floors is referred to as the plenum. The plenum is often the perfect spot to run all cables that connect the numerous computers often located in these buildings.

Q: _________ means that one bit after another is sent out onto the wire or fiber and interpreted by a network card or other type of interface on the other end.
A: Serial
If right: In network communications, serial means that one bit after another is sent out onto the wire or fiber and interpreted by a network card or other type of interface on the other end. Each 1 or 0 is read separately and then combined with others to form data.

Q: What special network interface, owned by the Public Switched Telephone Network, is often used between the service provider’s network and the internal network?
~ A smart jack, also called a Network Interface Device (NID) or network interface unit, is owned by the Public Switched Telephone Network (PSTN). A smart jack is a special network interface often used between the service provider’s network and the internal network. You cannot physically test to an actual demarc because it is just an RJ-45 jack, but the service provider may install a NID that has power and can be looped for testing purposes.

Q: What does multimode fiber-optic cable use as a light source of the data sent down the cable?
~ MMF is available in glass or in a plastic version that makes installation a lot easier and increases the installation’s flexibility. MMF usually uses LEDs for the light source of the data sent down the cable.

Q: _________ is the most prominent standard used for wireless LANs.
A: IEEE 802.11
If right: The most prominent standard for wireless LANs is 802.11, ratified by the IEEE in 1997. Of these standards, four are the most common: IEEE 802.11a, IEEE802.11b, IEEE 802.11g, and most recently IEEE 802.11n.