3.1.7 Section Quiz

Question 1

You’re installing network wiring for a new Ethernet network at your company’s main office building. The project specifications call for Cat 5e UTP network cabling and RJ45 wall jacks. Near the end of the project, you run out of wire before the last few runs are complete. You have a spool of Cat 3 network cable in storage. Upon closer inspection, it appears very similar to the Cat 5e wiring. To finish the project, should you use the Cat 3 cabling as a substitute for the Cat 5e cabling?

1. No. The sheath surrounding Cat 5e cabling is much thicker than the Cat 3 sheath, creating an extra layer of shielding that
   reduces crosstalk and supports higher data rates
2. Yes. You can use Cat 3 cabling as a substitute for Cat 5e cabling since they’re electrically identical
3. No. Cat 5e cabling uses a thicker copper wire than Cat 3 cabling, enabling higher data transmission rates.
4. No. Cat 5e cabling has more twists per inch than Cat 3 cabling, reducing crosstalk and supporting higher data rates

Answer 1

4. No. Cat 5e cabling has more twists per inch than Cat 3 cabling, reducing crosstalk and supporting higher data rates

While Cat 3 and Cat 5e cabling may appear physically similar, they’re electrically different. Cat 5e cabling is twisted much more tightly than Cat 3 cabling. This reduces crosstalk and enables Cat 5e wiring to support much faster data transmission rates.

Question 2

Which of the following cable types often includes a solid plastic core that keeps the twisted pairs separated?

1. Cat 3
2. Cat 6
3. Cat 5e
4. Cat 5

Answer 2

2. Cat 6

Cat 6 cables include a solid plastic core that keeps the twisted pairs separated and prevents the cable from being bent too tightly.

Cat 3, Cat 5, and Cat 5e don’t include a solid plastic core that keeps the twisted pairs separated.

Question 3

You’re adding new wires in your building for some new offices. The building has a false ceiling that holds the lights and provides an air path for heating and air conditioning. You’d like to run your Ethernet cables in this area. Which type of cable must you use?

1. Plenum-rated cable
2. Fiber optic cables
3. STP cables
4. Cat 5e or Cat 6a cables

Answer 3

1. Plenum-rated cable

Plenum rated cable is fire resistant and non-toxic. You must use plenum rated cable to wire in air spaces used by heating and air conditioning systems.

Cat 5e cables provide better EMI protection than Cat 5 cables, and Cat 6a cables are an improvement over Cat 6 specifications. However, neither of these qualities are a requirement for use in a ceiling area.

If an area has a lot of EM, you might consider using STP or fiber optic cables, but this isn’t a requirement in a ceiling area. Typically, you can avoid EMI sources by re-routing cables.

Question 4

Why might you use an RJ11 connector?

1. You want to connect a 10GBaseT network to a switch card using a Cat 6 cable
2. You want to connect your computer to the internet with a DSL modem
3. You want to upgrade your 10BaseT network to 100BaseTX
4. You want to connect your computer to a network using a Cat 7 cable

Answer 4

2. You want to connect your computer to the internet with a DSL modem

RJ11 connectors are typically used for telephones and modems.

RJ45 connectors are used for 100BaseTX.

RJ45 connectors are used for 10GBaseT using Cat 6 cables.

GG45 or TERA connectors are used with Cat 7 cables.

Question 5

Which of the following connectors is used with Ethernet 100BaseTX networks?

1. ST
2. RJ45
3. BNC
4. GG45

Answer 5

2. RJ45

RJ45 connectors are used with Ethernet 100BaseTX networks.

RJ11 connectors are used with phone, dial-up internet, and DSL modem connections.

BNC connectors are used with coaxial cable.

GG45 connectors are used with Cat 7 cables and support 10 Gbps Ethernet (10GBASE-T).

Question 6

Which of the following connector types would you most likely use to connect to a T1 WAN service?

1. RJ11
2. RJ45
3. RJ48c
4. GG45

Answer 6

3. RJ48c

An RJ48c connector is similar to an RJ45 connector, but it has different pin outs. RJ48c connectors are commonly used for T1 WAN connections.

RJ45 connectors are used for Ethernet.

RJ11 connectors are used for dial-up (modem) connections and some DSL connections.

GG45 are used with Cat 7 cabling.

Question 7

You’re working with an older 10Base2 Ethernet network. Which of the following connector types will you MOST LILKELY encounter?

1. BNC
2. F-type
3. ST
4. RJ11

Answer 7

1. BNC

A 10Base2 Ethernet network (also called a thinnet) is an older type of network that uses coaxial cables with BNC connectors for communication.

F-type connectors are used for cable and satellite TV connections as well as broadband cable connections. RJ11 connectors are typically used for dial-up and DSL connections. ST connectors are used with fiber optic cables.

Question 8

Which of the following are characteristics of a coaxial network cable? (Select two.)

1. It is composed of four pairs of 22-gauge copper wire.
2. It has a conductor made from copper in its center.
3. It uses two concentric metallic conductors.
4. It uses RJ45 connectors.
5. The conductors within the cable are twisted around each other to eliminate crosstalk.

Answer 8

2. It has a conductor made from copper in its center.
3. It uses two concentric metallic conductors.

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. Both ends of a coaxial cable must be terminated.

Twisted pair is composed of four pairs of 22-gauge copper wire. The wires are twisted to reduce crosstalk, and they use RJ45 connectors.

Question 9

You have a small home network connected to the internet using an RG-6 cable. You need to move the router, but you can’t find anymore RG-6 cabling. Which cable type could you use instead?

1. RG-58
2. Cat 5e
3. Cat 3
4. RG-59

Answer 9

4. RG-59

RG-6 has an impedance rating of 75 ohms. It’s important to use coaxial cables with the same impedance rating, and only RG-59 is rated for 75 ohms.

Connecting coaxial cables with Cat 3 and Cat 5e cables requires a media converter.

Question 10

You’ve just signed up for a broadband home internet service that uses coaxial cabling. Which connector type will you MOST LIKELY use?

1. RJ11
2. BNC
3. F-type
4. RJ45

Answer 10

3. F-type

Use an F-type connector for broadband cable connections that use coaxial cabling.

Use a BNC connector for 10Base2 Ethernet networks.

Use an RJII connector for modem connections to a phone line.

Use an RJ45 connector for an Ethernet network that uses twisted pair cabling.