A device operating at Layer 3 of the OSI model uses which of the following protocols to determine the path to a different network?

Several users from the same building are reporting connectivity issues. The SFP at that building's IDF switch is showing a link light, but there is no link light to the corresponding switch's SFP at the MDF. Which of the following is the MOST likely cause?

Which of the following technologies could be implemented to improve call clarity when using VoIP technology?

Which of the following would allow a network technician to access files on a remote system?
(Choose two.)

A network technician has salvaged several Ethernet cables from a datacenter. The technician attempts to use the cables to connect desktops to the network without success. Which of the following is MOST likely the issue?