CompTIA JK0-023 Exam Questions
CompTIA Network+ certification (Page 32 )

Updated On: 17-Feb-2026
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Which of the following uses classless subnet masks across a network?

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

Answer(s): B



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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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Which of the following routing protocols can be utilized as both an IGP and EGP?

  1. EIGRP
  2. RIP
  3. IGRP
  4. RIPv2

Answer(s): A



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Which of the following ports should be allowed through a firewall to allow DNS resolution to occur to an outside DNS server?

  1. 20
  2. 53
  3. 80
  4. 3389

Answer(s): B



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Which of the following networking devices can exist at several layers of the OSI model at the same time? (Select TWO).

  1. Switch
  2. Cable
  3. Repeater
  4. Router
  5. Bridge
  6. Hub

Answer(s): A,D






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