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Network+ Troubleshooting Tools and Methods Flashcards

7 cards from real COMPTIA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Network+ Troubleshooting Tools and Methods flashcards as text

  1. Which command on a Linux system shows the current routing table, including default gateway information?

    Answer: ip route show

    The 'ip route show' command displays the kernel routing table including the default route (gateway) on Linux systems.

  2. A Wireshark capture shows a TCP three-way handshake followed immediately by a RST packet from the server. What does this indicate?

    Answer: The destination port is closed or the application rejected the connection

    A RST immediately after SYN-ACK typically means the application on the server refused or is not listening on that port.

  3. A technician needs to verify that a GigabitEthernet link is achieving expected throughput. Which tool is BEST suited for this?

    Answer: iperf3 bandwidth test

    iperf3 is specifically designed to measure actual TCP/UDP throughput between two endpoints, making it the best choice for bandwidth verification.

  4. What does an 'APIPA' address (169.254.x.x) on a Windows workstation indicate during troubleshooting?

    Answer: The workstation failed to receive a DHCP lease

    APIPA (Automatic Private IP Addressing) assigns a 169.254.x.x address automatically when a DHCP server cannot be reached.

  5. During a Wireshark capture, you observe retransmissions increasing and window sizes shrinking to zero. What network condition does this suggest?

    Answer: TCP receive buffer exhaustion causing a zero-window condition

    A TCP zero-window advertisement means the receiver's buffer is full, forcing the sender to pause transmission until buffer space is freed.

  6. A technician uses 'show interface' on a Cisco switch and sees incrementing 'input errors' and 'CRC' counters. What is the MOST likely cause?

    Answer: Physical cable or hardware issue causing frame corruption

    CRC errors and input errors on a Cisco interface typically indicate a physical layer problem such as a bad cable, damaged connector, or faulty NIC.

  7. Which troubleshooting approach starts by identifying symptoms at the application layer before working down to the physical layer?

    Answer: Top-down approach

    The top-down approach begins troubleshooting at Layer 7 (Application) and works progressively down through the OSI model to Layer 1 (Physical).