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RHCSA SSH and Remote Access Configuration Flashcards

6 cards from real RHCSA 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. Which command shows active SSH connections to the local system?

    Answer: ss -tnp | grep :22

    `ss -tnp` lists TCP socket connections and filtering for `:22` shows active SSH sessions with their PIDs.

  2. What is the purpose of the `~/.ssh/known_hosts` file?

    Answer: Stores fingerprints of previously connected SSH servers

    `known_hosts` caches the host key fingerprints of remote servers to detect man-in-the-middle attacks on future connections.

  3. Which `sshd_config` directive sets the maximum number of concurrent unauthenticated SSH connections?

    Answer: MaxStartups

    `MaxStartups` limits unauthenticated connection attempts, helping protect against connection-based brute-force attacks.

  4. How do you use SCP to copy a local file to a remote host's `/tmp` directory?

    Answer: scp localfile user@host:/tmp/

    `scp source user@host:destination` securely copies files over SSH; the colon separates the host from the remote path.

  5. Which SSH client config file allows you to define aliases and per-host settings for SSH connections?

    Answer: ~/.ssh/config

    The `~/.ssh/config` file lets users define `Host` blocks with per-host settings like IdentityFile, Port, and User.

  6. What `firewall-cmd` command permanently allows SSH traffic through the firewall?

    Answer: firewall-cmd --permanent --add-service=ssh && firewall-cmd --reload

    Using `--permanent` with `--add-service=ssh` and then `--reload` ensures the SSH rule survives reboots.