CompTIA Linux+ (XK0-005) — Question 103

A user generated a pair of private-public keys on a workstation. Which of the following commands will allow the user to upload the public key to a remote server and enable passwordless login?

Answer options

• A. scp ~/.ssh/id_rsa user@server:~/
• B. rsync ~ /.ssh/ user@server:~/
• C. ssh-add user server
• D. ssh-copy-id user@server

Correct answer: D

Explanation

The correct command is 'ssh-copy-id user@server' because it specifically installs the public key on the remote server's authorized_keys file, enabling passwordless login. The other options either do not transfer the public key correctly or do not perform the intended function of enabling passwordless SSH access.