5.5 Given a scenario, troubleshoot network issues.
Objective 5.5 sits in Hardware and Network Troubleshooting, which carries 28% of the A+ Core 1 exam. The questions below are original, written from the official objective title above, and each explanation cites the CompTIA page it rests on.
Objective title verbatim from the official objectives. CompTIA exam page ↗
A worked example
Shown solved, with the whole explanation open: this is what every question here carries.
A technician captures a completed TCP session and observes the FIN flag set to 1 in both directions, with no abrupt termination. What does this indicate?
The concept
TCP sessions close through a four-way exchange where both endpoints agree to end the connection, marked by the FIN flag.
Why this answer
A FIN flag set to 1 on both sides is the defined marker of a mutually agreed, graceful four-way closure, not an abrupt termination.
- Correct: this is the defined behavior of a graceful, mutually agreed closure.
- BA reset is marked by the RESET flag, not FIN, and ends the session abruptly.
- CTIME_WAIT is the four-minute wait period that follows a graceful closure, not the closure itself.
- DThe handshake opens a session using SYN flags and occurs before any closure.
Now you: objective 5.5 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 3
Users report intermittent RDP failures. A technician runs simultaneous packet captures at the source and destination. The source shows repeated SYN retransmissions, but the destination trace shows none of those packets arriving. What is the most likely cause?
Sample question 2 of 3
A file share connection was already established over port 445 when an SMB negotiate packet is retransmitted five times, after which the source sends an ACK-RST. Which phase of the connection does this describe?
Sample question 3 of 3
During TCP troubleshooting, a technician needs to confirm whether a remote application on the destination machine is in a listening state on port 445. Which command should the technician run?
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Continue practicingRead the sources
These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.