1z0-100 무료 덤프문제 온라인 액세스

Examine the commands and output related to the use of the cron facility:

Which three statements are true concerning the use of the crontab utility? (Choose three.)

• A.The root user may not create the oracle user's crontab using crontab -u oracle -e
• B.The root user may not modify the oracle user's crontab using crontab -u oracle -e
• C.The oracle user may not delete the root user's crontab using crontab -u root -r
• D.The oracle user may list the root user's crontab using cat /var/spoo1/cron/root
• E.The oracle user may list the root user's crontab using crontab -u root -1
• F.The oracle user may not modify the root user's crontab using crontab -u root -e

Which two statements are true concerning OpenSSH configuration files? (Choose two.)

• A.If user harhest has an ssh configuration file called /home/harhest/.ssh/config, then this overrides the
  /etc/ssh/ssh_config file for OpenSSH sessions used by harhest
• B.The /etc/ssh/ssh_config file is the global configuration file for the sshd server daemon
• C.An ssh client uses either id_dsa.pub or id_rsa.pub to authenticate itself without a password, to an ssh server, which checks them into the target users' authorized_keys file
• D.Copying the /harhest/.ssh/known_hosts file from user harhest on hosta to the /jopam/.ssh/known_hosts file for user jopam on hostb, permits harhest to use OpenSSH commands to access the jopam account without supplying a password

Which three statements are correct about NFSV4?

• A.It uses a single port (2049) for all client/server communications.
• B.It relies on the LOCKD and RPC.STATD daemons to perform file locking.
• C.RPC.IDMAPD is used to map a UID to its username and a GID to its group name and vice versa.
• D.The UID and GID for a particular user must be the same on both client and server to avoid file ownership problems.
• E.It has support for filesystem quotas.

Which three statements correctly describes the purpose of and administration of kernel boot parameters in Oracle Linux?

• A.Additional kernel boot parameters may be specified in an administrator-specified parameter file that is read by grub stage.
• B.Kernel boot parameters used to boot the running system may be examined after boot by Viewing
  /boot/grub/grub/conf.
• C.Kernel boot parameters used to boot the running system may be examined after boot by viewing
  /proc/cmdline.
• D.Kernel boot parameters may be specified in /boot/grub/grub/conf.
• E.Additional kernel boot parameters may be specified from the grub command line.
• F.Additional kernel boot parameters may be specified in an administrator-specified parameters that is read by GRUB stage1_5.

A web server on HOST01 is listening on port 80.
Examine the IPTABLES rule shown:
[root@host01 ~] # iptables -L INPUT
Chain INPUT (policy ACCEPT)
targetportoptsourcedestination
ACCEPTtcp- - anywhereanywheretcp dpt:http
Another rule is then added:
[root@host01 ~] # iptables -A INPUT -P tcp - - dport 80 -j REJECT
What is the effect of this command on subsequent attempts to access the web server on HOST01 using port
80?

• A.New connection attempts succeed until a reload of the firewall rules.
• B.New connection attempts are refused and the client informed of the refusal.
• C.New connection attempts always succeed.
• D.New connection attempts timeout.