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Troubleshooting and Networking Flashcards

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

Read the first 7 Troubleshooting and Networking flashcards as text

  1. A user reports their Mac connects to Wi-Fi but websites won't load. Which tool should you use first to verify DNS resolution?

    Answer: Terminal with the 'nslookup' or 'dig' command

    Running 'nslookup' or 'dig' in Terminal directly tests whether DNS is resolving hostnames to IP addresses, pinpointing DNS as the failure point.

  2. Which macOS feature allows you to create a network location that automatically switches proxy settings when moving between office and home networks?

    Answer: Network Locations in System Settings > Network

    Network Locations let users save distinct sets of network settings (including proxies) and switch between them manually or via scripts.

  3. A MacBook Pro running macOS Ventura shows a self-assigned IP address (169.254.x.x). What is the most likely cause?

    Answer: The DHCP server is unreachable or not responding

    A 169.254.x.x address is an APIPA (Automatic Private IP Addressing) address assigned by macOS when it cannot obtain a lease from a DHCP server.

  4. When troubleshooting a suspected hardware issue on a Mac, which key combination boots into Apple Diagnostics on Apple silicon Macs?

    Answer: Hold and continue holding the power button until startup options appear, then select the Diagnostics icon

    On Apple silicon Macs, you hold the power button until startup options appear, then select the diagnostics option; the D key shortcut applies only to Intel Macs.

  5. A user cannot send email but can receive it. The outgoing mail server shows a connection error. Which port should you verify is not blocked by their ISP or firewall?

    Answer: Port 25 or 587 (SMTP)

    SMTP uses ports 25 and 587 for sending mail; many ISPs block port 25 to prevent spam, so port 587 with authentication is the standard alternative.

  6. Which command-line tool displays the routing table on macOS to help diagnose why traffic is being sent to the wrong gateway?

    Answer: netstat -rn

    'netstat -rn' prints the kernel routing table, showing destination networks, gateways, and interface assignments without performing DNS lookups.

  7. A technician uses Wireless Diagnostics on macOS. Which tab shows a real-time graph of signal quality and noise for the connected network?

    Answer: Performance

    The Performance tab in Wireless Diagnostics plots RSSI (signal), noise, and transmit rate over time, making it ideal for spotting intermittent signal issues.