CompTIA JK0-023 Exam
CompTIA Network+ certification (Page 39 )

Updated On: 19-Jan-2026

Which of the following exterior routing protocols uses an algorithm to determine the quickest route to a destination?

  1. RIP
  2. OSPF
  3. BGP
  4. RIPv2

Answer(s): C



After a new firewall is installed, users report that they do not have connectivity to the Internet. The output of the ipconfig command shows an IP address of 169.254.0.101. Which of the following ports would need to be opened on the firewall to allow the users to obtain an IP address? (Select TWO).

  1. UDP 53
  2. UDP 67
  3. UDP 68
  4. TCP 53
  5. TCP 67
  6. TCP 68

Answer(s): B,C



Which of the following uses classless subnet masks across a network?

  1. Subnetting
  2. CIDR
  3. Supernetting
  4. Summarization

Answer(s): B



Which of the following records allows for reverse DNS lookups?

  1. AAAA
  2. A
  3. PTR
  4. CNAME

Answer(s): C



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