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Network+ Troubleshooting and Tools 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.

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  1. Which command is used to display the local routing table on a Linux system?

    Answer: route -n

    The 'route -n' command (or 'ip route show') displays the kernel routing table, showing destination networks and their gateways.

  2. A switch port shows excessive 'runts' in its interface statistics. What does a runt indicate?

    Answer: Frames smaller than the 64-byte minimum Ethernet frame size

    Runts are Ethernet frames shorter than 64 bytes (the minimum), typically caused by collisions or a malfunctioning NIC.

  3. A technician suspects a problem with the physical network medium. Which tool should be used to measure signal attenuation over a copper cable run?

    Answer: Cable certifier / qualification tester

    A cable certifier measures attenuation, NEXT, insertion loss, and other parameters to verify a cable meets the TIA/EIA standard for its category.

  4. What does the 'nslookup' tool primarily allow a technician to do?

    Answer: Query DNS servers to resolve hostnames and troubleshoot DNS issues

    nslookup queries DNS servers to resolve names to IP addresses and can help diagnose DNS configuration or propagation problems.

  5. During troubleshooting, a technician finds that two switches are connected by two redundant links and both ports on both switches are forwarding. What problem does this create?

    Answer: Switching loop leading to a broadcast storm

    Two active forwarding paths between switches without STP creates a loop, causing frames to circulate indefinitely and creating a broadcast storm.

  6. A technician uses Nmap with the command 'nmap -sS 192.168.1.1'. What type of scan is being performed?

    Answer: TCP SYN (stealth) scan

    The -sS flag performs a TCP SYN scan, which sends SYN packets and analyzes responses without completing the full TCP handshake.

  7. Which of the following best describes a 'collisions' counter increasing on a half-duplex Ethernet interface?

    Answer: Indicates normal CSMA/CD operation but excessive collisions suggest congestion or a duplex mismatch

    Some collisions are normal on half-duplex Ethernet, but excessive collisions indicate high congestion or a duplex mismatch with the connected device.