CompTIA Network+ (N10-007) — Question 378

A network technician is troubleshooting an issue routing TCP packets to an email server. At which of the following OSI layers is the issue occurring?

Answer options

• A. Layer 1 ג€" Physical
• B. Layer 3 ג€" Network
• C. Layer 4 ג€" Transport
• D. Layer 7 ג€" Application

Correct answer: C

Explanation

The issue is occurring at Layer 4 - Transport, as TCP operates at this layer, managing the delivery of packets. If there were problems at Layer 1, the physical connection would be compromised; Layer 3 deals with routing but is not specifically responsible for TCP, and Layer 7 concerns application-level interactions, which is not where TCP routing issues arise.