Oracle Oracle Certifications 1Z0-820 Questions & Answers

• Question 41:

  The core dump configuration in your non global zone is

  

  A user is running a process in a non-global zone (testzone) and the process crashes. The process information is:

  user126632618017:46:42pts/20:00/usr/bin/bash

  When the user's process crashes in testzone, a non-global zone, where will the core dump be saved?

  A. The file will be stored in the non-global zone's directory: /var/core/pprocess/core.hash.2663.

  B. The file will be saved in the global zone's directory: /var/core/core.bash.2663.

  C. A core file cannot be generated in a non-global zone because it shares the kernel with the global zone.

  D. The file will be stored in the global zone's directory: /var/core/pprocess/core.bash.2663.

  E. The file will be saved in non-global zone's directory: /var/core/core.bash.2663

  Correct Answer: E

  Explanation: The line init core file pattern: /var/core/core.%f.%p will be used for the non-global process to determine the destination of the dump file.

  Note: When a process is dumping core, up to three core files can be produced: one in the per-process location, one in the system-wide global location, and, if the process was running in a local (non-global) zone, one in the global location for the zone in which that process was running.

  Reference: man coreadm

• Question 42:

  you are 10 create a l\-z> me system witn ine roiiowing specmcaiions: Izjb compression enabled cannot consume more than 2 GB from the storage pool redundant data at the block level eliminated mounted as /data Which command creates the desired file system?

  A. zfs create -o mountpoint=/data,compression=on,algorithm=lzjb,deduplication=on,quota=2g/pool1/data

  B. zfs create -o mountpomt=/data compression=on algonthm=lzjb deduphcation=on quota=2g pool!/data

  C. zfs create -o mountpoint=/data -o compression=on -o dedup=on -o quota=2g pooll/data

  D. zfs create -o mountpomt=/data -o compression=on -o algorithm=lzjb -o deduplication=on -o quota=2g pool 1/data

  E. zfs create pool 1 /data zfs set mountpoint=/data,quota=2g.dedup=on,compression=on /pooM/data

  Correct Answer: C

• Question 43:

  View the exhibit to inspect the file system configuration on your server.

  

  You department's backup policy is to perform a full backup to a remote system disk on Saturday.

  On each weekday, you are to perform an incremental backup to the same remote system disk.

  Each incremental backup will contain only data that has been modified since the previous Saturday backup.

  The server file systems must remain available at all times and can never be taken offline.

  The backup must not only provide for the recovery of the most recent version of a file, but must also allow recovery of previous versions of a file.

  Following your company policy, which two describe the correct procedure to be performed on each weekday for backing up the /data file system to a remote disk named /remote/backup?

  A. Remove the previous daily snapshot. zfs snapshot pool1.data@daily zfs send - i pool1/data@sat pool1/data@daily > /remote/backup/full

  B. Remove the previous daily snapshot. zfs snapshot pool1.data@daily zfs send - i pool1/data#sat pool1/data@daily | zfs recv remote /backup/ `date `+%m%d%'

  C. Remove the previous daily snapshot. zfs snapshot pool1.data@daily zfs send - i pool1/data@sat pool1/data@daily > /remote/backup/daily

  D. Remove the previous daily snapshot. zfs create - i pool1/data@sat pool1/data@daily zfs send pool1/data@daily | zfs remote/backup

  Correct Answer: BC

  Explanation: You can use the zfs send command to send a copy of a snapshot stream and receive the snapshot stream in another pool on the same system or in another pool on a different system that is used to store backup data.

  You can send incremental data by using the zfs send -i option.

  For example:

  host1# zfs send -i tank/dana@snap1 tank/dana@snap2 | zfs recv newtank/dana Note that the first argument (snap1) is the earlier snapshot and the second argument (snap2) is the later snapshot. In this case, the newtank/dana file system must already exist for the incremental receive to be successful. The incremental snap1 source can be specified as the last component of the snapshot name. This shortcut means you only have to specify the name after the @ sign for snap1, which is assumed to be from the same file system as snap2. For example:

  host1# zfs send -i snap1 tank/dana@snap2 > zfs recv newtank/dana This shortcut syntax is equivalent to the incremental syntax in the preceding example.

  Reference: Oracle Solaris ZFS Administration Guide, Sending and Receiving ZFS Data

• Question 44:

  Which command should you choose to display the current parameters for the FSS scheduler?

  A. dispadmin - c FSS

  B. prionctl -c FSS

  C. dispadmin -c FSS -g

  D. priocntl -c FSS -g

  Correct Answer: C

  Explanation: The dispadmin command displays or changes process scheduler parameters while the

  system is running.

  -c class

  Specifies the class whose parameters are to be displayed or changed. Valid class values are: RT for the

  real-time class, TS for the time-sharing class, IA for the inter-active class, FSS for the fair-share class, and

  FX for the fixed-priority class. The time-sharing and inter- active classes share the same scheduler, so

  changes to the scheduling parameters of one will change those of the other.

  -g

  Gets the parameters for the specified class and writes them to the standard output.

  Reference: man dispadmin

• Question 45:

  Which three statements accurately describe the Automated Installation (AI) client?

  A. If the AI client does not match any criteria to use a custom manifest or script, the default manifest is used.

  B. If the AI client does not match any criteria to use a custom manifest or script, the automated installation aborts.

  C. Any manifest or script in a service can be designated to be the default for that service.

  D. Only the default.xml file is used as the default AT client manifest.

  E. If a client system does not use any SC profile, then an interactive tool opens on that client at first boot after that client installation to complete the configuration of that client.

  F. If a client system does not use any SC profile, then the install server will use the default SC profile.

  Correct Answer: ADE

  Explanation: A: Each client uses one and only one AI manifest to complete its installation. The AI manifest is selected for a client according to the following algorithm:

  * If no custom AI manifests are defined for this install service, the default AI manifest is used. The default AI manifest is not associated with any client criteria

  etc.

  D: When you create a new install service,

  install_service_image_path/auto_install/manifest/default.xml is the initial default AI manifest for that install

  service.

  E: Each client can use any number of system configuration profiles. If a client system does not use any

  configuration profile, then an interactive tool opens on that client at first boot after that client installation to

  complete the configuration of that client.

  Reference: Installing Oracle Solaris 11 Systems, Customizing Installations

• Question 46:

  You are troubleshooting the failure of a computer to mount an NFS file system hosted by a server (hostname mars) in the local area network.

  Select the three commands that will enable you to identify the problem.

  A. ping - s mars

  B. cat /etc/vfstab

  C. cat /etc/dfs/dfstab

  D. sharemgr show -v

  E. showmount -e mars

  F. rpcinfo -s mars | egrep `nfs|mountd'

  Correct Answer: AEF

  mount: mount-point /DS9 does not exist.

  To solve the mount point error condition, check that the mount point exists on the client. Check the spelling

  of the mount point on the command line or in the /etc/vfstab file (B) on the client, or comment outthe entry

  and reboot the system.

  Note: The /etc/vfstab file lists all the file systems to be automatically mounted at system boot time, with the

  exception of the /etc/mnttab and /var/run file systems.

  E: showmount This command displays all clients that have remotely mounted file systems that are shared from an NFS server, or only the file systems that are mounted by clients, or the shared file systems with the client access information. The command syntax is:

  showmount [ -ade ] [ hostname ]

  where -a prints a list of all the remote mounts (each entry includes the client name and the directory), -d prints a list of the directories that are remotely mounted by clients, -e prints a list of the files shared (or exported), and hostname selects the NFS server to gather the information from. If hostname is not specified the local host is queried.

  F: * mountd Daemon

  This daemon handles file-system mount requests from remote systems and provides access control. The

  mountd daemon checks /etc/dfs/sharetab to determine which file systems are available for remote

  mounting and which systems are allowed to do the remote mounting.

  * Commands for Troubleshooting NFS Problems

  These commands can be useful when troubleshooting NFS problems.

  rpcinfo Command

  This command generates information about the RPC service that is running on a system.

  Reference: man showmount

• Question 47:

  You created a new zpool. Now you need to migrate the existing ZFS file system from pool1/prod to pool2/ prod.

  You have these requirements:

  1.

  Users must have access to the data during the migration, so you cannot shutdown the file system while the migration takes place.

  2.

  Because you want to copy the data as quickly as possible, you need to increase the server resources devoted to the ZFS migration.

  Which method would you use to modify the ZFS shadow migration daemon defaults to increase the concurrency and overall speed of migration?

  A. Svccfg - s filesystem/shadowd:default setprop config_params/shadow_threads=integer: 16 end svcadm refresh filesystem/shadowd: default

  B. Specify the -b option with the zfs create command and increase the value of

  C. Use the -o -volblocksize=option with the zfs create command and increase the value of the default .

  D. Svccfg -s filesystem/zfs: default setprop config_params/shadow_threads = integer: 16 end svcadm refresh filesystem/zfs:default

  Correct Answer: A

  Explanation: shadowd is a daemon that provides background worker threads to migrate data for a shadow migration. A shadow migration gradually moves data from a source file system into a new "shadow" file system. Users can access and change their data within the shadow file system while migration is occurring. The shadowd service is managed by the service management facility, smf(5). Administrative actions on this service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). The service's status can be queried using the svcs(1) command.

  The svccfg(1M) command can be used to manage the following parameter related to shadowd:

  config_params/shadow_threads

  Note: Oracle Solaris 11: In this release, you can migrate data from an old file system to a new file system while simultaneously allowing access and modification of the new file system during the migration process.

  Setting the shadow property on a new ZFS file system triggers the migration of the older data. The shadow property can be set to migrate data from the local system or a remote system with either of the following values:

  file:///path nfs://host:path

  Reference: man shadowd

• Question 48:

  The ZFS configuration on your server is:

  Pool1 6.67G31K/pool

  Pool1/data31K31K/data

  Select the three commands that you would use to 1. Create, 2. List, and 3. Delete a snapshot of the /data file system.

  A. zfs snapshot pool1/data@now

  B. zfs create snapshot pool1/data@now

  C. zfs list -t snapshot

  D. zfs list -t snapshot pool1/data

  E. zfs destroy pool1/data@now

  F. zfs destroy snapshot pool1/data@now

  Correct Answer: ADE

  Explanation: A: Snapshots are created by using the zfs snapshot command, which takes as its only argument the name of the snapshot to create.

  D: You can list snapshots as follows: # zfs list -t snapshot

  E: Snapshots are destroyed by using the zfs destroy command. For example: # zfs destroy tank/home/ahrens@now

• Question 49:

  Select the two correct descriptions of the configuration of a default installation of Oracle Solaris 11. (Choose two.)

  A. The root account no longer exists.

  B. Access to the root account is restricted by RBAC.

  C. The Solaris Management Console GUI (SMC) can be used to assign the root role to a user.

  D. telnet, ftp, and other services are disabled for network access, but root can log in by using SSH.

  E. Any logged in user, who knows the password for the root account, can modify the system configuration.

  F. usermod -R +root alice will allow user alice to assume the role of root to modify the system configuration.

  Correct Answer: BE

• Question 50:

  United States of America export laws include restrictions on cryptography. Identify the two methods with which these restrictions are accommodated in the Oracle Solaris 11 Cryptographic Framework.

  A. Corporations must utilize signed X.509 v3 certificates.

  B. A third-party provider object must be signed with a certificate issued by Oracle.

  C. Loadable kernel software modules must register using the Cryptographic Framework SPI.

  D. Third-party providers must utilize X.509 v3 certificates signed by trusted Root Certification Authorities.

  E. Systems destined for embargoed countries utilize loadable kernel software modules that restrict encryption to 64 bit keys.

  Correct Answer: BC

  B: Binary Signatures for Third-Party Software The elfsign command provides a means to sign providers to be used with the Oracle Solaris Cryptographic Framework. Typically, this command is run by the developer of a provider.

  The elfsign command has subcommands to request a certificate from Sun and to sign binaries. Another subcommand verifies the signature. Unsigned binaries cannot be used by the Oracle Solaris Cryptographic Framework. To sign one or more providers requires the certificate from Sun and the private key that was used to request the certificate.

  C: Export law in the United States requires that the use of open cryptographic interfaces be restricted. The Oracle Solaris Cryptographic Framework satisfies the current law by requiring that kernel cryptographic providers and PKCS #11 cryptographic providers be signed.

  Reference: System Administration Guide: Security Services, Oracle Solaris Cryptographic Framework