Intro to Computer Networks Practice Questions with Answers

Practice Questions Score:100% Question1:Which of the following cable types often includes a solid plastic core that keeps the twisted pairs separated? CorrectAnswer: Cat6 Incorrect Answer: Cat 3 Incorrect Answer: Cat 5e Incorrect Answer: Cat 5 EXPLANATI ON Cat 6 cables include a solid plastic core that keeps the twisted pairs separated and prevents the cable from being bent too tightly. Question2:Which of the following connectors is used with Ethernet 100BaseT networks? Incorrect Answer: RJ11 Incorrect Answer: BNC CorrectAnswer: RJ45 Incorrect Answer: ST EXPLANATI ON RJ45 connectors are used with Ethernet 100BaseT networks. RJ11 connectors are used with phone, dial-up internet, and DSL modem connections. BNC connectors are used with coaxial cable. ST connectors are used with fiber optic cable. Question3:Which of the following connector types would you most likely use to connect to a T1 WAN service? CorrectAnswer: RJ48c Incorrect Answer: RJ11 Incorrect Answer: RJ45 Incorrect Answer: GG45 EXPLANATI ON The RJ48c connector is similar to an RJ45 connector, but 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4:You are installing networking 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 investigation, it appears very similar to Cat 5e wiring. Should you use Cat 3 cabling as a substitute for Cat 5e cabling to finish the project? Incorrect Answer: No. The sheath surrounding Cat 5e cable is much thicker than the Cat 3 sheath, creating an extra layer of shielding that reduces cross-talk and supports higher data rates. Incorrect Answer: electrically identical. Yes. You can use Cat 3 cabling as a substitute for Cat 5e cabling, as they are CorrectAnswer: No.Cat5ecablinghasmoretwistsperinchthanCat3cabling,reducing cross-talkandsupportinghigherdatarates. Incorrect Answer: No, Category 3 cabling doesn't support RJ-45 connectors. Incorrect Answer: No. Cat 5e cabling uses a thicker copper wire than Cat 3 cable, enabling higher data transmission rates. EXPLANATI ON While Cat 3 and Cat 5e cabling may appear similar physically, they are electrically different. Cat 5e cabling is twisted much tighter than Cat 3 cabling. This reduces cross talk and enables Cat 5e wiring to support much faster data transmission rates. Question5:You are 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 would like to run your Ethernet cables in this area. Which type of cable must you use? Incorrect Answer: STP cables Incorrect Answer: Fiber optic cables Incorrect Answer: Cat 5e or Cat 6a cables CorrectAnswer: Plenumratedcable Incorrect Answer: PVC jacketed cables EXPLANATI ON 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. You cannot use PVC jacketed cable to wire above ceilings because it is toxic when burned. Cat 5e cables provide better EMI protection than Cat 5 cables, and Cat 6a cables are an improvement over Cat 6 specifications, but neither of these qualities are a requirement for use in a ceiling area. If the area has a lot of EMI, you might consider using STP or fiber optic cables, but this is not a requirement for wires were in a ceiling area. Typically, you can avoid EMI sources by re-routing cables. Question6:Why might you use an RJ11 connector? Incorrect Answer: You want to connect the 10BaseT network card in your computer to a switch. CorrectAnswer: YouwanttoconnectyourcomputertotheinternetwithaDSLmodem. Incorrect Answer: You want to upgrade your 10BaseT network to 100BaseTX. Incorrect Answer: You want to test a network cable to see if there is a break in the line. EXPLANATI ON RJ11 connectors are typically used for telephones and modems. Question7:When would you typically use an RJ11 connector? Incorrect Answer: When using Cat 5 or higher cables Incorrect Answer: When using Cat 3 cables Incorrect Answer: When using multi-mode fiber optic cables Incorrect Answer: When using RG-6 cables CorrectAnswer: Whenconnectingaphonetoaphoneline Incorrect Answer: When using single-mode fiber optic cables EXPLANATI ON An RJ11 connector is used for connecting analog telephones to the telephone jacks. Cat 3, Cat 5, and higher twisted pair cables use RJ45 connectors. Coaxial cables use F-type or BNC connectors. Fiber optic cables use a variety of connectors (ST, SC, LC, MT-RJ, FC).