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
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.
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.
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.
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.
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.
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.
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.