CompTIA JK0-023 Exam Questions
CompTIA Network+ certification (Page 19 )

Updated On: 17-Feb-2026
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Which of the following protocols does DNS utilize on port 53?

  1. TCP
  2. FTP
  3. RTP
  4. ICMP

Answer(s): A



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Which of the following network devices builds a table of ports to MAC addresses to forward packets only to necessary ports?

  1. Switch
  2. Hub
  3. Router
  4. Repeater

Answer(s): A



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Which of the following OSI layers performs error detection using a Frame Check Sequence?

  1. Session
  2. Transport
  3. Physical
  4. Data link

Answer(s): D



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At which of the following layers of the OSI model do packets exist?

  1. Network
  2. Session
  3. Data Link
  4. Transport

Answer(s): A



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An administrator is using a packet sniffer to try to determine what is causing the traffic on the network. The administrator sees a lot of packets on port 25. Which of the following traffic types is MOST likely using port 25?

  1. SMTP
  2. SSH
  3. DNS
  4. TELNET

Answer(s): A






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