5.4 Given a scenario, troubleshoot common mobile device issues.
Objective 5.4 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 traffic from a tablet that suddenly stops responding to a file server. The capture shows a session end with the RST flag set to 1 and all connection details erased immediately. What does this indicate?
The concept
TCP sessions can end either gracefully through a four-way closure or abruptly through a reset, and the two are distinguishable by which flag is set.
Why this answer
An RST flag set to 1 signals an abrupt session closure, which immediately releases resources and erases all connection information, matching the behavior seen in the capture.
- Correct: this is the only closure type that erases connection info immediately.
- BA graceful closure is identified by the FIN flag, not RST, and does not erase data abruptly.
- CTIME_WAIT follows a graceful closure and is a waiting period, not an abrupt erasure of state.
- DA three-way handshake starts a session and would show SYN and SYN-ACK flags, not RST.
Now you: objective 5.4 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 3
A user's smartphone finishes a file transfer with a corporate server and closes the connection gracefully. A technician notes the port stays reserved for several minutes afterward. What is this default wait state called, and how long does it typically last?
Sample question 2 of 3
An employee's phone cannot sync corporate email. A packet capture on the phone shows a TCP SYN retransmitted three times with no reply, while a simultaneous capture at the server shows none of those SYN packets arriving. What does this most likely indicate?
Sample question 3 of 3
A tablet's SYN packets reach the mail server during a sync attempt, but the server never responds. A technician wants to confirm whether the destination port is actually listening. Which command should be run on the server?
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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.