CompTIA JK0-023 Exam Questions
CompTIA Network+ certification (Page 8 )

Updated On: 17-Feb-2026
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An administrator notices SMTP traffic is being blocked by the company firewall. Which of the following ports should be opened?

  1. 25
  2. 53
  3. 110
  4. 443

Answer(s): A



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Which of the following uses types and codes rather than ports?

  1. EIGRP
  2. ICMP
  3. UDP
  4. IPv6

Answer(s): B



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Which of the following network protocols is used to resolve FQDNs to IP addresses?

  1. DNS
  2. FTP
  3. DHCP
  4. APIPA

Answer(s): A



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Jeff, a network technician, is concerned about the environmental effects of power consumption and heat from network resources. Limited space is also a concern. Which of the following technologies should be implemented?

  1. Circuit switching
  2. Network address translation
  3. Power over Ethernet
  4. Virtual servers

Answer(s): D



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A firewall that operates at Layer 7 of the OSI model is known as a(n):

  1. Circuit gateway.
  2. Packet filter.
  3. Application level.
  4. Redundant firewall.

Answer(s): C






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