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Network Services Management 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.

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  1. A user reports that their Mac can browse the web but cannot connect to a local SMB file server by hostname. Pinging the server by IP succeeds. What is the most likely cause?

    Answer: DNS is not resolving local hostnames

    When IP connectivity works but hostname resolution fails, DNS is not returning the correct local record for that hostname.

  2. Which macOS command-line tool can be used to flush the DNS cache?

    Answer: dscacheutil -flushcache && killall -HUP mDNSResponder

    On macOS, flushing the DNS cache requires clearing the local cache with dscacheutil and signaling mDNSResponder to reset.

  3. A Mac is configured with a manual IP address but loses network access after another device joins the network. What is the most likely issue?

    Answer: There is an IP address conflict

    When a manually configured IP is also assigned by DHCP to another device, an IP conflict causes both machines to lose reliable connectivity.

  4. In macOS, where can an administrator configure a Mac to use a specific DNS server for a particular network interface?

    Answer: System Settings > Network > [Interface] > Details > DNS

    The DNS tab within an interface's Details pane in Network settings allows per-interface DNS server configuration.

  5. A Mac using Wi-Fi shows a self-assigned IP address (169.254.x.x). What does this indicate?

    Answer: The DHCP server did not respond

    A 169.254.x.x address is an APIPA address assigned by the OS when DHCP lease acquisition fails.

  6. Which protocol does macOS use to discover services like printers and file shares on a local network without requiring a DNS server?

    Answer: Bonjour (mDNS)

    Bonjour uses multicast DNS (mDNS) over port 5353 to advertise and discover services on the local subnet without a central DNS server.

  7. An IT administrator needs to test whether TCP port 443 is open on a remote server from a Mac. Which command is most appropriate?

    Answer: nc -zv server.example.com 443

    The netcat (nc) command with -zv flags performs a port scan verbosely without sending data, confirming whether TCP port 443 is open.