Skillset can help you prepare! Sign up for your free Skillset account and take the first steps towards your certification.
Which of the following is not a layer 1 problem?
Noisy serial line.
Loose cable network cable connection.
MAC addresses are not being recorded.
Incorrect cable type.
Defective CSU or DSU.
MAC Addresses refer to layer 2, the data-link layer of the OSI model. All other answers are typical layer 1 (the physical layer) problems. Don't get hung up on CSU/DSU and clock rates for this question - when discussing layer one, any equipment failure is a "physical" or Layer 1 problem.
Study thousands of practice questions that organized by skills and ranked by difficulty.
Create a tailored training plan based on the knowledge you already possess.
Know when you’re ready for the high-stakes exam. Have the confidence that you will pass on your first attempt.