Practice Test GeeksLinux Practice Test
← All Linux Flashcard Decks

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. What does CIDR notation `/24` indicate about a network?

    Answer: The first 24 bits are the network portion

    In CIDR notation, `/24` means 24 bits are used for the network prefix, leaving 8 bits for host addresses (254 usable hosts).

  2. Which command would you use to test if a remote host is reachable at the network layer?

    Answer: ping

    `ping` sends ICMP echo request packets to test basic connectivity and measure round-trip time to a host.

  3. What is the loopback IP address in IPv4?

    Answer: 127.0.0.1

    127.0.0.1 is the IPv4 loopback address (also `localhost`) used by the system to communicate with itself.

  4. Which tool scans for open ports and services on a target host?

    Answer: nmap

    `nmap` (Network Mapper) is a widely-used tool for port scanning, service detection, and network discovery.

  5. What does the ARP protocol resolve?

    Answer: IP addresses to MAC addresses

    ARP (Address Resolution Protocol) maps an IPv4 address to the corresponding hardware (MAC) address on a local network segment.

  6. Which `netstat` flag shows only listening sockets?

    Answer: -l

    The `-l` flag in `netstat` (or `ss -l`) filters output to display only sockets in the listening state.

  7. What is the default gateway's role in a network?

    Answer: Routes traffic destined for networks outside the local subnet

    The default gateway is the router that handles traffic destined for IP addresses not in the local subnet.