Oracle Oracle Certifications 1Z0-821 Questions & Answers

• Question 21:

  View the exhibit.

  

  The configuration information in the exhibit is displayed on your system immediately after installing the OS.

  Choose the option that describes the selection made during the Installation of the OS to obtain this configuration.

  A. The automatic network configuration option was chosen during the installation of the OS.

  B. The manual network configuration option was chosen during the installation of the OS.

  C. The network was not configured during the installation of the OS.

  D. The DHCP network configuration option was chosen during the Installation of the OS.

  Correct Answer: A

  There are two ways to configure the network configuration: automatic or manual. In the exhibit we see that DHCP has been used used. This indicates an automatic network configuration.

• Question 22:

  After installing the OS, the following network configuration information is displayed from the system:

  

  Which option describes the state of this server?

  A. The automatic network configuration option was chosen during the installation of the OS.

  B. The manual network configuration option was chosen during the installation of the OS.

  C. The network was not configured during the installation of the OS.

  D. The network interface is configured with a static IP address.

  Correct Answer: C

  Only the loopback addresses are configured. No IP address is configured.

• Question 23:

  You are asked to troubleshoot networking issues on an unfamiliar system. Select the correct command to display what network devices are installed.

  A. ifconfig -a

  B. dladm show-dev

  C. dladm show-phys

  D. dladm show-ether

  E. netadm show-dev

  F. netadm show-ether

  Correct Answer: C

• Question 24:

  Your server has a ZFS storage pool that is configured as follows:

  

  The following partition scheme is used for every disk drive in pool1:

  

  Which two are true regarding the ZFS storage pool?

  A. The data on c3t3d0 is duplicated on c3t4do.

  B. The data is striped across disks c3t3d0 and c3t4do and mirrored across vdevs mirror-0 and mirror-1.

  C. The storage pool is 146 GB total size (rounded to the nearest GB).

  D. The storage pool is 584 G8 total size (rounded to the nearest GB).

  E. The storage pool is 292 GB total size (rounded to the nearest GB).

  Correct Answer: AE

• Question 25:

  You have set up the task.max-lwps resource control on your Solaris 11 system.

  Which option describes how to configure the system so that syslogd notifies you when the resources control threshold value for the task.max-lwps resource has been exceeded?

  A. Use the rctladm command to enable the global action on the task.max-lwpa resource control.

  B. Modify the /etc/syslog.conf file to activate system logging of all violations of task.max- lwps and then refresh then svc: /system/system-log:default service.

  C. Activate system logging of all violations of task.max-lwpp in the /etc/rctldm.conf file and then execute the rctladm-u command.

  D. Use the prct1 command to set the logging of all resource control violations at the time the task.maxlwps resource control is being setup.

  E. Use the setrct1 command to set the logging of all resource control violations for the task.max-lwps resource control.

  Correct Answer: A

  rctladm - display and/or modify global state of system resource controls

  The following command activates system logging of all violations of task.max-lwps.

  # rctladm -e syslog task.max-lwps #

• Question 26:

  The /etc/hosts file can be best described as______.

  A. a local database of host names for rlogin, rsh, and rep

  B. the configuration file for the host name of the system

  C. a local database of information for the uname command

  D. the configuration file for the Domain Name Service (DNS)

  E. a local database of host names and their associated IP addresses

  Correct Answer: E

  As your machine gets started, it will need to know the mapping of some hostnames to IP addresses before DNS can be referenced. This mapping is kept in the /etc/hosts file. In the absence of a name server, any network program on your system consults this file to determine the IP address that corresponds to a host name.

• Question 27:

  User jack logs in to host solaris and then attempts to log in to host oracle using ssh. He receives the following error message:

  The authenticity of host oracle (192.168.1.22) can't be established. RSA key fingerprint is 3B:23:a5:6d:ad:a5:76:83:9c:c3:c4:55:a5:18:98:a6

  Are you sure you want to continue connecting (yes/no)?

  Which two are true?

  A. The public host key supplied by solaria is not known to the host oracle.

  B. The error would not occur if the RSA key fingerprint shown in the error message was added to the /etc/ ssh/known_hosts file on solaris.

  C. The private host key supplied by oracle is not known to solaris.

  D. If jack answers yes, the RSA public key for the host oracle will be added to the known_hosts file for the user jack.

  E. The public host key supplied by oracle is not known to the host solaris.

  Correct Answer: BD

  The fingerprints are used to guard against man in the middle attacks. Since ssh logins usually work over the internet (an insecure connection), someone could hijack your connection. When you try to log into yourmachine.com, he could get "in the middle" and return your challenge as if he was yourmachine.com. That way, he could get hold of your login password.

  To make this attack harder, ssh stores the fingerprint of the server's public key on the first connection attempt. You will see a prompt like:

  The authenticity of host 'eisen (137.43.366.64)' can't be established. RSA key fingerprint is cf:55:30:31:7f:f0:c4:a0:9a:02:1d:1c:41:cf:63:cf. Are you sure you want to continue connecting (yes/no)

  When you enter yes, ssh will add the fingerprint to your known_hosts file. you will see Code: Warning: Permanently added 'eisen, 137.43.366.64' (RSA) to the list of known hosts.

  The next time you login, ssh will check whether the host key has changed. A changing host key usually indicates a man in the middle attack, and ssh refuses to connect.

• Question 28:

  Which three statements are true concerning Image Packaging System (IPS) incorporation package?

  A. Installing an incorporation package does not install any other packages.

  B. Every feature or tool has a separate IPS incorporation.

  C. They constrain the versions of packages they incorporate.

  D. They are a content management tool and not a version management tool.

  E. Their dependencies are always of TYPE-REQUIRE.

  F. They are defined by their manifest

  Correct Answer: ACE

• Question 29:

  You have completed configuring a zone named dbzone on your Solaris 11 server. The configuration is as following:

  

  The global zone displays the following network information:

  

  The zone has never been booted. Which three options correctly describe this zone?

  A. It is a sparse root zone.

  B. It is a whole root zone.

  C. It is an immutable zone.

  D. It is a native zone.

  E. The zone shares the network interface with the host.

  F. The zone uses a virtual network interface.

  G. The hostid is the same as the global zone.

  H. The IP address of the zone is 10.0.2.18.

  Correct Answer: CEG

  C: Immutable Zones provide read-only file system profiles for solaris non-global zones.

  Note that ip-type: exclusive:

  Starting with OpenSolaris build 37 and Oracle Solaris 10 8/07, a default zone can be configured as an

  "exclusive-IP zone" which gives it exclusive access to the NIC(s) that the zone has been assigned.

  Applications in such a zone can communicate directly with the NIC(s) available to the zone.

  Note on zones:

  After installing Oracle Solaris on a system, but before creating any zones, all processes run in the global

  zone. After you create a zone, it has processes that are associated with that zone and no other zone. Any

  process created by a process in a non-global zone is also associated with that non-global zone.

  Any zone which is not the global zone is called a non-global zone. Most people call non- global zones

  simply "zones." Some people call them "local zones" but this is discouraged.

  The default native zone file system model on Oracle Solaris 10 is called "sparse-root." This model

  emphasizes efficiency and security at the cost of some configuration flexibility. Sparse-root zones optimize

  physical memory and disk space usage by sharing some directories, like /usr and /lib. Sparse-root zones

  have their own private file areas for directories like /etc and /var. Whole-root zones increase configuration

  flexibility but increase resource usage. They do not use shared file systems for /usr, /lib, and a few others.

  There is no supported way to convert an existing sparse-root zone to a whole-root zone.

  Creating a new zone is required.

• Question 30:

  You are executing this command in the default shell:

  sleep 5000 and

  The system displays a number. This value is______.

  A. the priority of the /usr/bin/sleep process

  B. the process ID of the /usr/bin/sleep process

  C. the process ID of the shell spawned to execute /usr/bin/sleep

  D. the process group ID that includes the /usr/bin/sleep process

  E. the amount of memory allocated to the /usr/bin/sleep process

  F. the current number of instances of the /usr/bin/sleep process

  Correct Answer: C

  If a command is terminated by the control operator `and', the shell executes the command asynchronously in a subshell. This is known as executing the command in the background. The shell does not wait for the command to finish, and the return status is 0 (true).