102-400 試験問題を無料オンラインアクセス

What is a purpose of an SSH host key?

• A.It is the root key by which all user SSH keys must be signed.
• B.It is used by system services like cron, syslog or a backup job to automatically connect to remote hosts.
• C.It authenticates any user that logs into a remote machine from the key's host.
• D.It must be sent by any SSH client in addition to a user key in order to identify the client's host.
• E.It provides the server's identity information to connecting SSH clients.

Which of the following lines are valid in the file /etc/hosts? (Choose TWO correct answers.)

• A.2001:db8::15 www.example.com www
• B.www.example.com,www 203.0.13.15,2001:db8::15
• C.2003.0.113.15,2001:db8::15 www.example.com www
• D.203.0.113.15 www.example.com www
• E.www.example.com www 203.0.13.15

How can the existing environment variable FOOBAR be suppressed for the execution of the script./myscript only?

• A.unset -v FOOBAR;./myscript
• B.env -i FOOBAR./myscript
• C.env -u FOOBAR./myscript
• D.set -a FOOBAR="";./myscript

Which of the following commands puts the output of the command date into the shell variable mydate?

• A.mydate="$((date))"
• B.mydate="$(date)"
• C.mydate="exec date"
• D.mydate="${date}"
• E.mydate="date"

Which of the following commands connects to the remote host example.com which has OpenSSH listening on TCP port 2222? (Choose TWO correct answers.)

• A.ssh --port 2222 example.com
• B.ssh -p 2222 example.com
• C.ssh example.com:2222
• D.ssh -o Port=2222 example.com
• E.ssh -o GatewayPort=2222 example.com