CompTIA JK0-023 Exam Questions
CompTIA Network+ certification (Page 28 )

Updated On: 17-Feb-2026
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Which of the following TCP/IP and OSI model layers retransmits a TCP packet if it is not received successfully at its destination?

  1. The transport OSI model layer and the transport TCP/IP model layer.
  2. The transport OSI model layer and the Internet TCP/IP model layer.
  3. The network OSI model layer and the transport TCP/IP model layer.
  4. The network OSI model layer and the Internet TCP/IP model layer.

Answer(s): A



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Which of the following ports would have to be allowed through a firewall for NTP to pass on its default port?

  1. 123
  2. 143
  3. 153
  4. 163

Answer(s): A



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A network technician has determined a managed network switch has failed. The technician knows how to install a new switch, but not how to properly configure it. Which of the following troubleshooting steps should the technician take NEXT?

  1. Escalate the problem
  2. Identify potential effects
  3. Test the theory to determine cause
  4. Establish a plan of action to resolve the problem

Answer(s): A



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Which of the following protocols is the BEST choice for retrieving email on multiple devices?

  1. IMAP4
  2. SMTP
  3. FTP
  4. SNMPv3

Answer(s): A



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Logically separating the ports on a switch without physically separating them can be done using which of the following?

  1. Routing tables
  2. Hub logic
  3. Spanning tree protocol
  4. VLANs

Answer(s): D






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