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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. A technician runs 'nslookup mail.company.com' and receives a different IP than expected. What should be checked next?

    Answer: DNS server records and potential DNS poisoning

    An unexpected DNS response could indicate stale DNS records or DNS cache poisoning that must be investigated on the DNS server.

  2. Which tool would a technician use to measure the exact length of a copper cable run and identify where a break occurs?

    Answer: TDR (Time Domain Reflectometer)

    A TDR sends a signal down the cable and measures the time for reflection to calculate cable length and pinpoint faults.

  3. After replacing a NIC, a workstation cannot communicate with any host. Ping to 127.0.0.1 succeeds but ping to the default gateway fails. What is the MOST likely cause?

    Answer: The NIC driver is not installed correctly

    Loopback success confirms TCP/IP is functional, but failure to reach the gateway after a NIC replacement most likely means the driver is missing or faulty.

  4. A network map shows an unknown device with IP 192.168.1.254 that does not appear in DHCP leases. What tool would BEST identify this device?

    Answer: Nmap port/OS scan

    Nmap can perform host discovery and OS fingerprinting to identify unknown devices on a network segment.

  5. A user reports intermittent packet loss. You run iperf between two hosts and see consistent 2% loss. What should you check NEXT?

    Answer: Interface error counters on the switch ports

    Consistent measured packet loss points to a physical or link-layer issue best revealed by checking interface error counters on the connecting switch ports.

  6. Which protocol does the 'arp -a' command display information about?

    Answer: Cached IP-to-MAC address mappings

    The 'arp -a' command shows the local ARP cache, which maps IP addresses to MAC addresses learned on the local network segment.

  7. A technician uses a loopback plug on a switch port and the port LED shows link. What has been confirmed?

    Answer: The switch port's physical transmit and receive circuits are functioning

    A loopback plug confirms the switch port can transmit and receive at the physical layer, isolating the port from the cable plant.