JK0-023 Layers Practice Questions
The free JK0-023: CompTIA Network+ certification questions that deal with layers, with answers and explanations. The full bank and the timed practice test cover every topic the exam asks about.
Question #4
In which of the following layers of the OSI model does the TCP protocol operate?
Correct answer: D
Explanation
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.
Question #6
Which of the following OSI layers is responsible for encrypting HTTPS traffic?
Correct answer: D
Explanation
Encryption is a presentation layer function, and the presentation layer is Layer 6. Layers 3, 4, and 5 handle routing, transport, and session control.
Question #7
An IP address is encapsulated at which of the following layers of the OSI model?
Correct answer: C
Explanation
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.
Question #9
Which of the following OSI layers performs error detection using a Frame Check Sequence?
Correct answer: D
Explanation
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.
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