XK0-004 Free Practice Test

All users are reporting that they cannot connect to the SFTP server. The administrator runs a scan:

Which of the following would allow the administrator to fix the problem?

1. A. Allow SFTP connections on port 22 using /etc/sysconfig/iptables.
2. B. Allow SFTP connections on port 20 and 21 using /etc/sysconfig/iptables.
3. C. Allow SFTP connections on port 25 using /etc/sysconfig/iptables.
4. D. Allow SFTP connections on port 1456 using /etc/sysconfig/iptables.

Correct Answer: A

A Linux server needs to be accessed, but the root password is not available.
Which of the following would BEST allow an administrator to regain access and set a new known password at the same time?

1. A. Boot into a single-user mode and reset the password via the passwd command.
2. B. Boot into a single-user mode and reset the password by editing the /etc/passwd file.
3. C. Boot into a single-user mode and reset the password by editing the /etc/shadow file.
4. D. Boot into a single-user mode and reset the password via the chage command.

Correct Answer: A

A systems administrator must clean up all application files in the directory /var/log/app. However, the company’s security policy requires the files to be kept on the backup server for one year. The Linux server has only the tar and bzip2 packages installed.
Which of the following commands will package and compress the files?

1. A. tar –zcvf applicationfiles.tar.bz2 /var/log/app/*
2. B. tar –jcvf applicationfiles.tar.bz2 /var/log/app/*
3. C. tar –cvf applicationfiles.tar.bz2 /var/log/app/*
4. D. tar –xvf applicationfiles.tar.bz2 /var/log/app/*

Correct Answer: C

A Linux systems administrator is setting up SSH access with PKI for several using their newly created RSA keys. Which of the following MOST securely achieves this task?

1. A. Use curl to copy each user’s public key file to the respective system
2. B. Use cp to copy each user’s public key file to the respective system
3. C. Use ssh-copy-id to copy each user’s public key file to the respective system
4. D. Use ssh-copy-id to copy each user’s private key file to the respective system

Correct Answer: C

A Linux systems administrator wants the ability to access systems remotely over SSH using RSA authentication. to which of the following files should the RSA token be added to allow this access?

1. A. authorized_keys
2. B. ~/.ssh/ssh_config
3. C. id_rsa.pub
4. D. known_hosts

Correct Answer: C