23. Cable Connectivity Issues and Tools. Flashcards
- Which is a tool in the network scanner category?
a. Packet sniffer
b. IPS/IDS software
c. Port scanners
d. None of the above
a, b, c. All of the above. The CompTIA Network + objectives cover all three in regard to tools used to analyse today’s networks
- What is the purpose of packet sniffers?
a. Discarding frames
b. Sending transmissions from one port to another port
c. Looking inside every packet on a network segment
d. Stopping malicious behaviour on the network
c. The basic purpose of packet sniffers or network analysers is to collect and analyse each individual packet that is captured on a specific network segment to determine whether problems are happening. You can also use them to see if there is too much traffic on a segment.
- You need to trace cables in multiple pair wiring. Which tool will you use?
a. Toner probe
b. Cable stripper/snips
c. Cable tester
d. Butt set
a. A toner probe sends a signal down a pair of wires so that the wires can be traced. Typically a butt set is used to find this signal, but toner probe is the best answer to this question.
- What tool would you use to find a break in a fibre-optic connection and test hte fibre connectivity on the network?
a. Multimeter
b. OTDR
c. Butt set
d. Toner probe
b. An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to give you the skinny on optical fibres. It works by putting out a series of optical pulses into the specific fibre you want to test and can tell you if a break in the fibre has occurred and where.
- You need to create a cable that will connect your host to a wall jack connection. Which of the following will you use?
a. IDS/IPS
b. Snips
c. Coax cable strippers
d. Multimeter
b. To create a patch cable (T568A) to connect your host to a jack in the wall, you need to use a snip.
- End-to-end loss across an ethernet cable is called ______.
a. Degradation
b. Attenuation
c. Runts
d. Spectrum loss
b. End-to-end loss is referred to as attenuation. If the loss is too great across a cable, the received signal may be too weak to be demodulated.
- What is the purpose of a port scanner?
a. Scan UDP for closed ports
b. Sweep TCP for closed ports
c. Search the network host for open ports.
d. Validate operations.
c. A port scanner is just a piece of software designed to search a network for open ports. Administrators of networks use port scanners to ensure security and bad guys use them to compromise it.
- What is the purpose of wire-map testers?
a. Check copper cable for crossed pairs only
b. Analyse protocols in software
c. Help find unused protocols and remove them from the network
d. Detect transposed wires, open, and shorts in twisted pair cables
d. Wire-map testers are used to determine the cable pinouts from one end of a cable to the other. It can also identify open pins and shorts. By using a wire-map tester on an ethernet cable, you can verify the cable is pinned correctly and has no open or shorted connection.
- Which of the following can check the speed and condition of a signal on a cable, measure the time it takes to send a signal down the wire and back, and find the exact location of the break?
a. Multimeter
b. TDR
c. Tone generator
d. Event recorder
b. A time-domain reflectometer gives you very detailed information on the cable under test. It measures delay across the wire, and if there is a break in the cable, it can give you the approximate distance to where the break is.
- Which device should be used if you need to determine whether your network meets ISO or TIA standards?
a. Angry IP
b. Certifiers
c. Nmap
d. Routing Table
b. A certifier connects to a cable and runs a bank of tests that can verify whether it meets the standards set by organisations such as ISO or TIA.
- Which software tool is used to view network traffic at the frame level?
a. TDR
b. Multimeter
c. Port scanner
d. Packet sniffer
d. A packet sniffer captures and analyses ethernet frames on a network. The sniffer can be used for detailed troubleshooting of transmit and receive traffic on a LAN from the frame level to the application layer.
- Which of the following options is not a function of a TDR?
a. Estimate cable lengths
b. Find splice and connector locations and their associated loss amounts
c. Display unused services
d. Determine cable impedance characteristics
e. Send a signal down a cable and measure how long it takes to come backd
c. A time-domain reflectometer is used to test physical layer properties of a cable such as impedance characteristics, delay, cable lengths, splices and cable breaks. It does not see application-level information such as unused services or any LAN information.
- Which device would be used to measure voltage?
a. Multimeter
b. OTDR
c. Butt set
d. Toner probe
a. The trusty multimeter can be used to measure AC and DC levels and resistance.
- Which device would most likely be used to locate a specific connection in an unlabelled punch down block.
a. VOM
b. Certifier
c. TDR
d. Toner probe
d. A toner probe allows you to identify a cable that may be in a large bundle and hard to trace. At the remote end, a tone generator is attached to the cable, and then the probe can be used to find the cable at the other end.
- Which tool would be used to connect wire between two punch down block blades?
a. Punch-down tool
b. Crimper
c. Snips
d. Strippers
a. Just as it is named, a punch-down tool is used to “punch” a wire into a cable block. Crimpers are used to put a jack onto the end of a cable, and snips and strippers are used to prepare the cable.
