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Networking Flashcards

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

Read the first 7 Networking flashcards as text

  1. Which command displays the routing table on a Linux system?

    Answer: netstat -r

    The `netstat -r` command (or `ip route show`) displays the kernel IP routing table.

  2. What does the `ss` command replace in modern Linux distributions?

    Answer: netstat

    `ss` (socket statistics) is the modern replacement for `netstat` and provides faster, more detailed socket information.

  3. Which file on a Linux system maps hostnames to IP addresses locally before DNS is queried?

    Answer: /etc/hosts

    The `/etc/hosts` file provides static hostname-to-IP mappings that are checked before DNS resolution.

  4. What is the purpose of the `/etc/resolv.conf` file?

    Answer: Specifies DNS server addresses for name resolution

    `/etc/resolv.conf` configures the DNS resolver by specifying nameserver addresses and search domains.

  5. Which port does SSH use by default?

    Answer: 22

    SSH (Secure Shell) listens on TCP port 22 by default for encrypted remote connections.

  6. What does the `traceroute` command do?

    Answer: Shows the path packets take to reach a destination

    `traceroute` sends packets with incrementing TTL values to reveal each hop between source and destination.

  7. Which `ip` command subcommand would you use to add a new IP address to an interface?

    Answer: ip addr add

    `ip addr add / dev ` adds an IP address to a specified network interface.