A server administrator notices that one of the servers cannot connect to its gateway, which has the IP
10.10.10.1.
Which of the following commands should the administrator execute to determine the default gateway of the server?

• A.route -n
• B.ip a default-gw
• C.ifconfig
• D.nslookup

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A systems administrator is unable to reach other devices on the network and the Internet. The server is configured with the IP address 192.169.1.50/24 on eth0. The server's router is 192.168.1.1. The administrator reviews the output of route -n:

Which of the following commands should the administrator run to correct the issue?

• A.route del default gw 192.168.2.1 eth0; route add default gw 192.168.1.1 eth0
• B.route add 192.168.1.1 default 192.168.1.50 eth0
• C.route add -net 192.168.10.0 netmask 255.255.255.0 gw 192.168.2.1 eth0
• D.route host gw 192.168.1.1 eth0

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A junior systems administrator created a new filesystem /dev/sda1 with mountpoint /data and added it to the /etc/fstab for auto-mounting.
When the systems administrator tries to mount the file system, the system refuses. Given the output below:

Which of the following steps is necessary?

• A.Change the options to auto,dev,sync,rw,nosuid and run the mount -a command.
• B.Change the filesystem from /dev/sda1 to /dev/sda2 and reboot.
• C.Change the mount point to data and reboot.
• D.Change the dump column to 1 and run the mount -a command.

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A junior systems administrator has generated a PKI certificate for SSH sessions. The administrator would like to configure authentication without passwords to remote systems. Which of the following should the administrator perform?

• A.Add the content of id_rsa.pub file to the remote system ~/.ssh/known_hosts location.
• B.Add the content of id_rsa.pub file to the remote system ~/.ssh/authorized_keys location.
• C.Add the content of id_rsa file to the remote system ~/.ssh/authorized_keys location.
• D.Add the content of id_rsa file to the remote system ~/.ssh/known_hosts location.

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A user has been locked out of an account due to too many failed password attempts. Which of the following commands will unlock the user's account?

• A.pam_tally2 --user=user --reset
• B.usermod -u user -G root
• C.chage -1 user=user --reset
• D.passwd -u user -G root

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