Free JK0-023: CompTIA Network+ certification Exam Questions and Answers
208 verified practice questions for JK0-023.
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Last updated: September 19, 2026
- Exam code
- JK0-023
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- CompTIA
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- 1000+
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- First 10, with answers
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Question #1
Which of the following operates at OSI layer 2 to forward traffic based on the MAC address?
Please select an optionIncorrectCorrect answer: A
A switch forwards frames at Layer 2 based on MAC addresses. Routers and VPN concentrators operate at Layer 3, and proxy servers work at higher layers.
Was this answer correct?Question #2
Which of the following is used to prevent Layer 2 switching loops within a local area network?
Please select an optionIncorrectCorrect answer: A
Spanning Tree Protocol blocks redundant paths so Layer 2 switching loops cannot form. MTU is a frame size value, and EGP and IGP are routing protocol categories.
Was this answer correct?Question #3
Kurt, a network technician, has been troubleshooting a connectivity problem in the LAN room. He has diagnosed the problem and implemented a solution. Which of the following would be Kurt’s NEXT step?
Please select an optionIncorrectCorrect answer: D
After implementing and verifying the solution, the technician documents the findings, which is the final step of the troubleshooting process. Testing the theory and establishing a plan of action come earlier.
Was this answer correct?Question #4
In which of the following layers of the OSI model does the TCP protocol operate?
Please select an optionIncorrectCorrect answer: D
TCP is a transport layer protocol providing reliable, connection oriented delivery. The session, network, and data link layers handle dialogues, addressing and routing, and framing.
Was this answer correct?Question #5
Which of the following is used to embed the MAC address of an Ethernet interface in a corresponding IPv6 address?
Please select an optionIncorrectCorrect answer: C
EUI-64 derives the interface identifier from the 48 bit MAC address by inserting FFFE and flipping the universal bit, forming a 64 bit IPv6 interface ID. Subnets, IANA prefixes, and site local addresses do not embed the MAC.
Was this answer correct?Question #6
Which of the following OSI layers is responsible for encrypting HTTPS traffic?
Please select an optionIncorrectCorrect answer: D
Encryption is a presentation layer function, and the presentation layer is Layer 6. Layers 3, 4, and 5 handle routing, transport, and session control.
Was this answer correct?Question #7
An IP address is encapsulated at which of the following layers of the OSI model?
Please select an optionIncorrectCorrect answer: C
The network layer adds logical IP addressing to packets and routes them between networks. Ports belong to the transport layer and MAC addresses to the data link layer.
Was this answer correct?Question #8
Which of the following protocols would the network administrator use to protect login credentials when accessing a router terminal session?
Please select an optionIncorrectCorrect answer: D
SSH encrypts the terminal session, so the administrator's login credentials are protected on the wire. SCP is a file transfer over SSH, SNMPv3 secures device monitoring, and SSL secures web traffic.
Was this answer correct?Question #9
Which of the following OSI layers performs error detection using a Frame Check Sequence?
Please select an optionIncorrectCorrect answer: D
The data link layer adds a Frame Check Sequence to each frame and uses it to detect transmission errors. The session, transport, and physical layers do not perform FCS based error detection.
Was this answer correct?Question #10
Which of the following protocols is used to send time synchronization updates on a given network?
Please select an optionIncorrectCorrect answer: A
NTP synchronizes clocks across network devices by exchanging time updates. POP3 and IMAP retrieve mail, and DNS resolves hostnames.
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