Cable testing and troubleshooting

Correct Answer: Check the integrity and quality of the cable

The problem indicated here is related to a network access issue where the computer is not able to connect to the network. Given the fact that a Cat5 cable is in use, it's possible that the cable itself could be faulty or damaged which is why the 'Check the integrity and quality of the cable' is the correct answer. Cat5 cables are commonly used for network connections and should work properly unless they are damaged or overly long. Replacing the Cat5 cable with a fiber optic cable would be unnecessary and costly as Cat5 cables are capable of handling network connections. Installing a wireless access point would be irrelevant in this instance as the computer is using a wired connection. Changing the entire network architecture is an extreme measure to be considered only when there are significant issues affecting a large number of systems or the network as a whole, instead of an individual computer.

Correct Answer: Cable analyzer

The 'Cable analyzer' is the best tool for identifying and isolating the crosstalk issue for a network cable. It is capable of diagnosing the physical layer of a network by measuring crosstalk and other parameters which could disturb the network performance. Whereas, 'Toner probe' is used for tracing wires and locating cable ends, 'Multimeter' is used for measuring electrical properties like voltage, resistance, and current, and a 'Cable tester' is a device used for checking the strength and connectivity of a cable, but they do not have the precise capability of measuring crosstalk.

Correct Answer: Time-domain reflectometer (TDR)

A Time-domain reflectometer (TDR) is the correct tool to use for locating a cut within a large organization's network. TDRs work by sending a signal down a cable and then measuring the time it takes for the signal to return, or 'reflect', back. Any discontinuities in the cable, such as cuts or breaks, will cause the signal to reflect sooner, allowing the TDR to calculate the distance to the fault. A Cable tester is used to verify the electrical connections in a cable, but it's not capable of identifying the exact location of a cable cut. On the other hand, a Cable certifier is a much more sophisticated device which is capable of identifying a wide range of faults within a network. However, they're designed for certifying the installation of new cabling, not for troubleshooting problems in existing networks. Finally, an OTDR (Optical Time Domain Reflectometer) operates on the similar principles as a TDR, but it works for optical fibers instead of electrical cables.