Isaiec 62443 Cybersecurity Fundamentals Specialist · Free Practice Question Medium
Question 38
At Layer 4 of the Open Systems Interconnection (OSI) model, which component identifies the application that will handle a packet inside a host?
- A ATCP/UDP registry number
- B A TCP/UDP port number
- C ATCP/UDP application ID
- D A TCP/UDP host ID
Reveal correct answer
Correct answer: B
Explanation
At Layer 4 of the Open Systems Interconnection (OSI) model, a TCP/UDP port number identifies the application that will handle a packet inside a host. Port numbers are numerical identifiers used at the Transport Layer to differentiate between multiple applications or services running on the same host. They help direct the incoming data packets to the appropriate application process.Discussion
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