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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 discovers that hosts on two VLANs cannot communicate even though inter-VLAN routing is configured. Which tool would BEST verify the routing configuration?

    Answer: 'show ip route' on the router/L3 switch

    The 'show ip route' command on the router or Layer 3 switch reveals whether routes for both VLANs are present and correctly configured.

  2. What is the purpose of using a tone generator and probe (toner) in network troubleshooting?

    Answer: Tracing and identifying a specific cable among many unlabeled cables

    A tone generator injects an audible signal into a cable, and the probe detects and amplifies it, allowing a technician to trace the cable through walls or patch panels.

  3. A user cannot resolve external domain names but can ping external IP addresses directly. Which OSI layer is the problem MOST likely at?

    Answer: Layer 7 – Application (DNS service)

    Successful pings to IPs confirm Layer 1-3 are functional; name resolution failure points to a DNS (Layer 7 application service) problem.

  4. Which command would a technician use to release and renew a DHCP lease on a Windows workstation?

    Answer: ipconfig /release followed by ipconfig /renew

    The ipconfig /release command drops the current DHCP lease and /renew initiates a new DHCP discovery process to obtain a fresh lease.

  5. A Wireshark filter 'tcp.flags.syn==1 && tcp.flags.ack==0' is applied. What traffic will this display?

    Answer: Only TCP connection initiation (SYN) packets

    This filter matches packets with only the SYN flag set and no ACK, which are the initial connection request packets in a TCP three-way handshake.

  6. A switch port connected to a server keeps going into err-disabled state. What is the MOST likely cause?

    Answer: A port security violation due to too many MAC addresses or a BPDU guard trigger

    Err-disabled state is commonly triggered by port security violations (too many MACs) or BPDU guard detecting a switch on an access port.

  7. Which network troubleshooting methodology divides the network in half to identify which segment contains the fault, then repeatedly halves the remaining suspect segment?

    Answer: Divide and conquer (binary) approach

    The divide and conquer approach tests the midpoint of the network or OSI stack to quickly narrow down the fault domain by half each iteration.