Which device can determine whether a cable break or short exists and approximately how far down the cable it$$s located?

Network monitor

RMON

Time$-$domain reflectometer

Protocol analyzer

At what layer of the OSI model is a CRC error detected?

Data Link

Network

Physical

Session

Which type of plan makes it easier to return a network to its state before an upgrade?

Backup plan

Rollback plan

Upgrade plan

Downgrade plan

Based on the eight$-$step problem$-$solving process discussed in this chapter, what$$s the first step in network troubleshooting?

Devise a solution.

Consider possible causes.

Test the cables.

Determine the problem definition and scope.

Which problem$-$solving approach requires a solid understanding of how networks work?

Trial and error

Step by step with the OSI model

Solve by example

Replacement method