A user, jsmith, needs access to database files located on a server. Which of the following will add jsmith to the
"dba" group and preserve existing group memberships?

Joe, a user, is unable to log in to the server and contracts the systems administrator to look into the issue. The administrator examines the /etc/passwd file and discovers the following entry:
joe:x:505:505::/home/joe:/bin/false
Which of the following commands should the administrator execute to resolve the problem?

A Linux administrator wants to obtain a list of files and subdirectories in the /etc directory that contain the word "services". Once the files and subdirectories are discovered, they should be listed alphabetically in the / var/tmp/foundservicesfile. Which of the following shell scripts will accomplish this task?
#/bin/bash

A technician wants to secure a sensitive workstation by ensuring network traffic is kept within the local subnet.
To accomplish this task, the technician executes the following command:
echo 0 > /proc/sys/net/ipv4/ip_default_ttl
Which of the following commands can the technician use to confirm the expected results? (Choose two.)

A user is reporting unusual slowness when trying to transfer a large file to an NFS server from a workstation.
The administrator runs tracepath and gets the following output:

Which of the following BEST describes the issue and a possible solution?