6.3.6 Practice Questions Networking Media

Which of the following are advantages of using fiber optic cabling for a network, as opposed to other types of cabling?

Immunity to electromagnetic interference. Greater cable distances without a repeater. Explanation Compared to other types of cabling, fiber optic cabling allows greater cable distances without a repeater and is immune to electromagnetic interference. However,installation costs more and takes longer. In addition, fiber optic cabling is much less flexible than other cabling.

What is a major benefit of STP over UTP?

Greater resistance to interference. Explanation Shielded Twisted Pair (STP) has a grounded outer copper shield around the bundle of twisted pairs around each pair. This provides added protection against EMI. Unshielded Twisted Pair (UTP) does not have a grounded outer copper shield.

You are using a crimper to attach an RJ-45 connector to a Cat UTP cable. You need to use the T568A standard to connect the individual wires to the connector. Which wire should be connected to pin 1?

Green with white Explanation According to the T568A standard, the green with white wire should be connected to pin 1 in the Rj-45 connector.

What type of cabling can be used for an Ethernet 100Base-T (100 Mbps) network?

Category 5e UTP Category 5 UTP Explanation Ethernet 100Base-T uses category 5 and 5e cabling. Cat 3 is designed for use with 10 megabit Ethernet or 16 megabit token ring. Coaxial cabling is used with 10Base2 or 10Base5 Ethernet.

What type of cable configuration is shown here and what is it used for?

Crossover cable configuration. Used to connect computers directly to one another for networking. Explanation This is a crossover cable configuration. Using this, computers can connect directly to one another. The easiest way to create a crossover cable is to arrange the wires in the first connector using the T568A standard and arrage the wires in the second connector using the T568B standard.

You have just signed up for a broadband home Internet service that uses coaxial cable. Which connector type will you most likely use?

F-Type Explanation Use an F-type connector for broadband cable connections that use coaxial cable. Use a BNC connector for 10Base-2 Ethernet networks. Use an RJ-11 connector for modem connections to a phone line. Use an RJ-45 connector for an Ethernet network that uses twisted pair cable. Use ST and SC connectors for fiber optic cables.

Which network type uses light pulses to transmit data?

Fiber optic Explanation Fiber optic networks transmit light pulses rather than electricity to communicate. Satellite networks use radio signals sent and received from a satellite. Cable networks use a cable TV connection and electric signals to send data. Wireless networks use radio waves for sending network data within a local area network.

Which of the following are characteristics of coaxial network cable?

It has a conductor made from copper in the center of the cable. It uses two concentric metallic conductors. Explanation Coaxial cable is composed of a central copper conductor surrounded by an insulator which is then surrounded by a second metallic mesh conductor. The name coaxial is derived from the fact that both of these conductors share a common axis. Twisted-pair cables are twisted around each other to reduce the effects of Electromagnetic Interference (EMI) and crosstalk. Fiber optic cables have a plastic or glass center, known as the core. Only fiber optic cables are totally immune to Electromagnetic Interference (EMI), because light pulses, instead of electrical signals, represent the data.

At distance of under 2 km, delivers data rates up to 1 Gbps.

Multimode

Cable lengths are limited in distance

Multimode

Data transfers through the core using more than one light rays.

Multimode

You are installing networking cable in the air space between the ceiling and the roof of a building. Which type of cabling should you use?

Plenum Explanation Plenum cable is fire resistant and non-toxic, making it optimal for wiring above ceiling tiles. PVC cable cannot be used to wire above ceilings because it is toxic when burned. Both STP and fiber optic cables can be rated for plenum areas, but are not in themselves fire resistant.

Which kind of connector do you use to connect a modem to a standard telephone line?

RJ-11 Explanation A standard telephone line connector is an RJ-11. RJ-45 jacks are used for Ethernet twisted pair cables. Video cards and monitors with a built-in TV tuner have an F-type video connector. RG-58 is used for 10 BAse2 Ethernet networking (also called Thinnet).

Which connector is used with unshielded twisted pair (UTP) cable?

RJ-45 Explanation An RJ-45 connector is used with unshielded twisted pair (UTP) cable. BNC and AUI are used with coaxial cables. DIX is an Ethernet protocol.

At distance up to 3 km, delivers data rates up to 10 Gbps.

Single mode

Cable lengths can extend a great distance.

Single mode

The core diameter is around 10 microns.

Single mode

Explanation

Single mode fiber optic cable has the following characteristics: Data transfers through the core using a single light ray (the ray is also called a mode) The core diameter is around 10 microns. At distances up to 3 km, single mode delivers data rates up to 10 Gbps. Cable lengths can extend a great distance. Multimode fiber optic cable has the following characteristcs: Data transfers through the core using multiple light rays. The core diameter is around 50 to 100 microns. At distances of under 2kn, multimode delivers data rates up to 1 Gbps. Cable lengths are limited in distance. Fiber optic cable does not have a "dual mode" type.

Which of the following situations is more likely to justify the investment in Category 6a cable instead of Category 6?

The work area has a lot of electromagnetic interference (EMI). Explanation Category 6a cable is designed to be less susceptible to electromagnetic interference (EMI) than Category 6. Network performance can be greatly diminished by higher than average EMI. When cable is run under the floor, it must be Plenum insulated to be fire resistand and non-toxic, but doesn't need to be Cat6. Streaming video doesn't justify the extra cost of Category 6a cable when Category 6 cand handle the same bandwidth.