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Code d'Examen: 1z0-485
Nom d'Examen: Oracle (Exadata Database Machine Models X3-2 and X3-8 Implementation Essentials)
Questions et réponses: 71 Q&As

Code d'Examen: 1z0-062
Nom d'Examen: Oracle (Oracle Database 12c: Installation and Administration)
Questions et réponses: 166 Q&As

Code d'Examen: 1z1-485
Nom d'Examen: Oracle (Exadata Database Machine Models X3-2 and X3-8 Implementation Essentials)
Questions et réponses: 71 Q&As

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NO.1 Which two statements are true about the logical storage structure of an Oracle database?
A. An extent contains data blocks that are always physically contiguous on disk.
B. An extent can span multiple segments,
C. Each data block always corresponds to one operating system block.
D. It is possible to have tablespaces of different block sizes.
E. A data block is the smallest unit of I/O in data files.
Answer: B,D

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Reference: http://docs.oracle.com/cd/E11882_01 /server.112 /e40540/logical.htm#CNCPT250

NO.2 Which three statements are true about a job chain?
A. It can contain a nested chain of jobs.
B. It can be used to implement dependency-based scheduling.
C. It cannot invoke the same program or nested chain in multiple steps in the chain.
D. It cannot have more than one dependency.
E. It can be executed using event-based or time-based schedules.
Answer: A,B,E

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Reference:
http://docs.oracle.com/cd/B28359_01 /server.111 /b28310/scheduse009.htm#ADMIN12459
12. Which two tasks can be performed on an external table?
A. partitioning the table
B. creating an invisible index
C. updating the table by using an update statement
D. creating a public synonym
E. creating a view
Answer: C,D

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13. A user establishes a connection to a database instance by using an Oracle Net connection.
You want to ensure the following:
1.The user account must be locked after five unsuccessful login attempts.
2.Data read per session must be limited for the user. 3- The user cannot have more than three
simultaneous sessions.
4. The user must have a maximum of 10 minutes session idle time before being logged off
automatically.
How would you accomplish this?
A. by granting a secure application role to the user
B. by implementing Database Resource Manager
C. by using Oracle Label Security options
D. by assigning a profile to the user
Answer: D

Oracle   certification 1z0-062   1z0-062 examen
14. Which action takes place when a file checkpoint occurs?
A. The checkpoint position is advanced in the checkpoint queue.
B. All buffers for a checkpointed file that were modified before a specific SCN are written to disk by
DBWn and the SCN is stored in the control file.
C. The Database Writer process (DBWn) writes all dirty buffers in the buffer cache to data files.
D. The Log Writer process (LGWR) writes all redo entries in the log buffer to online redo log files.
Answer: C

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15. As a user of the ORCL database, you establish a database link to the remote HQ database
such that all users in the ORCL database may access tables only from the SCOTT schema in the HQ
database. SCOTT's password is TIGER. The service mane "HQ" is used to connect to the remote HQ
database.
Which command would you execute to create the database link?
A. CREATE DATABASE LINK HQ USING 'HQ';
B. CREATE DATABASE LINK HQ CONNECT TO CXJRRENT_USER USING HQ' S
C. CREATE PUBLIC DATABASE LINK HQ CONNECT TO scott IDENTIFIED BY tiger USING 'HQ';
D. CREATE DATABASE LINK HQ CONNECT TO scott IDENTIFIED BY tiger USING 'HQ';
Answer: B

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NO.3 Examine the resources consumed by a database instance whose current Resource Manager
plan is displayed.
SQL> SELECT name, active_sessions, queue_length, Consumed_cpu_time, cpu_waits,
cpu_wait_time FROM v$rsrc_consumer_group;
NAMEACTIVE_SESSIONS QUEUE_LENGTH CONSUMED_CPU_WAITS CPU_WAIT_TIME
OLTP__ORDER__ENTRY1029690 467 6709 OTHES__GROUPS 0 059823664089 60425 SYS_GROUP 1
02420704 914 19540 DS.S_QUERIES4245946603004 55700
Which two statements are true?
A. An attempt to start a new session by a user belonging to DSS_QUERIES fails with an error.
B. An attempt to start a new session by a user belonging to OTHE_GROUPS fails with an error.
C. The CPU_WAIT_TIME column indicates the total time that sessions in the consumer group waited
for the CPU due to resource management.
D. The CPU_WAIT_TIME column indicates the total time that sessions in the consumer group waited
for the CPU due to I/O waits and latch or enqueue contention.
E. A user belonging to the DSS__QUERIES resource consumer group can create a new session but
the session will be queued.
Answer: C,E

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NO.4 Examine the parameters for your database instance:
NAMETYPE VALUE
undo_management string AUTO undo_retentioninteger 12 00 undo_tablespace string UNDOTBS1
You execute the following command:
SQL> ALTER TABLESPACE undotbs1 RETENTION NOGUARANTEE;
Which statement is true in this scenario?
A. Undo data is written to flashback logs after 1200 seconds.
B. Inactive undo data is retained for 1200 seconds even if subsequent transactions fail due to lack of
space in the undo tablespace.
C. You can perform a Flashback Database operation only within the duration of 1200 seconds.
D. An attempt is made to keep inactive undo for 1200 seconds but transactions may overwrite the
undo before that time has elapsed.
Answer: A

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NO.5 Which two statements correctly describe the relationship between data files and logical
database structures?
A. A segment cannot span data files.
B. A data file can belong to only one tablespace.
C. An extent cannot span data files.
D. The size of an Oracle data block in a data file should be the same as the size of an OS block.
Answer: B,C

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Reference: https://mohibalvi.wordpress.com/tag/alter-tablespace/

NO.6 You plan to create a database by using the Database Configuration Assistant (DBCA), with the
following specifications:
-Applications will connect to the database via a middle tier.
-The number of concurrent user connections will be high.
-The database will have mixed workload, with the execution of complex BI queries scheduled at
night.
Which DBCA option must you choose to create the database?
A. a General Purpose database template with default memory allocation
B. a Data Warehouse database template, with the dedicated server mode option and AMM enabled
C. a General Purpose database template, with the shared server mode option and Automatic
Memory Management (AMM) enabled
D. a default database configuration
Answer: C

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Reference:
http://www.oracledistilled.com/oracle-database/administration/creating-a-databaseusing-database
-configuration-assistant/

NO.7 The ORCL database is configured to support shared server mode. You want to ensure that a
user connecting remotely to the database instance has a one-to-one ratio between client and server
processes.
Which connection method guarantees that this requirement is met?
A. connecting by using an external naming method
B. connecting by using the easy connect method
C. creating a service in the database by using the dbms_service.create_service procedure and using
this service for creating a local naming service"
D. connecting by using the local naming method with the server = dedicated parameter set in the
tnsnames.ora file for the net service
E. connecting by using a directory naming method
Answer: C,E

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NO.8 The hr user receiver, the following error while inserting data into the sales table: ERROR at line
1:
ORA-01653; unable to extend table HR.SALES by 128 in tablespace USERS
On investigation, you find that the users tablespace uses Automnrif Segment Space Management
(ASSM). It is the default tablespace for the HR user with an unlimited quota on it.
Which two methods would you use to resolve this error?
A. Altering the data life associated with the USERS tablespace to ex automatically
B. Adding a data life to the USERS tablespace
C. Changing segment space management for the USERS tablespace to manual
D. Creating a new tablespace with autoextend enabled and changing the default tablespace of the
HR user to the new tablespace
E. Enabling resumable space allocation by setting the RESUMABLE_TIMEOUT parameter to a
nonzero value
Answer: A,D

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Code d'Examen: 1z1-485
Nom d'Examen: Oracle (Exadata Database Machine Models X3-2 and X3-8 Implementation Essentials)
Questions et réponses: 71 Q&As

Code d'Examen: 1z0-485
Nom d'Examen: Oracle (Exadata Database Machine Models X3-2 and X3-8 Implementation Essentials)
Questions et réponses: 71 Q&As

Code d'Examen: 1z0-100
Nom d'Examen: Oracle (Oracle Linux 5 and 6 System Administration)
Questions et réponses: 108 Q&As

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NO.1 Examine this output:
# df -t nfs
FilesystemSizeUsedAvailUse%Mounted on
o16:export30G21G7.6G74%/mnt
# 1s -1 /mnt/nfs.sh
-rwxr-mr-x. 1 root root 22 May 8 16:37 /mnt/nfs.sh
# file /mnt/nfs.sh
/mnt/nfs.sh: Bourne-Again shell script text executables
# /mnt/nfs.sh
bash: /mnt/nfs.sh: Permission denied What is the reason for the error?
A. The file system was exported on host o16 using the ROOT_SQUASH option.
B. The /export filesystem was mounted with the NOEXEC option on host o16.
C. The filesystem mounted on /mnt was mounted with the NOEXEC option.
D. The filesystem was exported on host o16 by using the NO_ROOT_SQUASH option.
Answer: A

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NO.2 You want to display the value of a shell variable called service after assigning a value as
shown:
SERVICE =ACCT S
Which two settings will display the name of the variable and its value?
A. set | grep service
B. echo $SERVICE
C. env | grep SERVICE
D. env $SERVICE
E. set $SERVICE
Answer: B,C

Oracle examen   certification 1z0-100   1z0-100
Explanation:
C: env - set the environment for command invocation
If no utility operand is specified, the resulting environment shall be written to the standard output,
with one name= value pair per line.

NO.3 This MDADM output:
Which two aspects can be determined from this output?
A. A device failed and has been removed from this RAID set.
B. It is no longer possible to write to this RAID set.
C. Read and write performance is no longer optimal on this RAID set.
D. This RAID set was built without a spare device.
E. Only Write performance is no longer optimal on this RAID set.
Answer: A,D

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NO.4 Which statements is true concerning Oracle Linux configuration files for users and groups?
A. The /etc/passwd file contains hashed passwords for each user.
B. The /etc/shadow file contains hashed passwords for each user.
C. The GECOS field in /etc/passwd file may be empty.
D. The /etc/group file contains the group name and the hashed group password.
Answer: B

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Explanation:
/etc/shadow file stores actual password in encrypted (one-way hashed) format for user's account
with additional properties related to user password i.e. it stores secure user account information

NO.5 Which two software packages are prerequisites for enabling the configuration and use of a
Network information Service (Nis) client?
A. nis-tools
B. slapi-nis
C. ypbind
D. nisserv
E. nisbind
F. yp-tools
Answer: C,E

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Explanation:
C: ypbind finds the server for NIS domains and maintains the NIS binding information. The client
(normaly the NIS routines in the standard C library) could get the information over RPC from ypbind
or read the binding files.
E: Setting up a NIS master server:
Required packages: yp-tools ypbind ypserv portmap

NO.6 Examine the command on its output:
[root@FAROUT ~] # modprobe -v nfs
Insmod /lib/modules/ 2.6.39-100.0.12.e16uek.x86_64 /kernel/fs/nfs_common/nfs_acl.ko insmod
/lob/modules/ 2.6.39
100.0.12.e16uek.x86_64 /kernel/net/sunrpc/auth_gss/auth_rpcgss.ko
Insmod /lib/modules/ 2.6.39-100.0.12.e16uek.x86_64 /kernel/fs/fscache/fscache/ko
Insmod /lib/modules/ 2.6.39-100.0.12.e16uek.x86_64 /kernel/fs/locked.ko
Insmod /lib/modules/ 2.6.39-100.0.12.e16uek.x86_64 /kernel/fs/nfs/nfs.ko
Which two statements are true about the modprobe command?
A. It will load the nfs module if all the modules upon which it depends have been loaded.
B. It displays the dependency resolution for the nfs module and loads all the modules upon which
nfs depends before loading the nfs module.
C. It verifies that the nfs module and all other modules that depend on the nfs module are installed.
D. It displays the dependency resolution that would occur if the nfs module were to be loaded using
modprobe nfs.
E. It only loads the nfs module if all the modules upon which it depends have not been loaded yet.
Answer: A

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Reference: http://redhat.activeventure.com/ 8 /customizationguide/ch-kernel-modules.html (kernel
module utilities)

NO.7 What is the main advantage of the Oracle Unbreakable Enterprise Kernel compared with the
Red Hat compatible kernel?
A. It is more secure and, therefore, more difficult to hack.
B. It has a lower Mean Time Between Failures.
C. It provides higher availability for applications by reducing Mean Time to Recovery.
D. It scales better for more CPUS, memory, and Infiniband network connections.
Answer: D

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Explanation:
The Unbreakable Enterprise Kernel, for those who want to leverage the latest
features from
mainline Linux and boost performance and scalability.
The Red Hat Compatible Kernel, for those who prefer strict Red Hat kernel ABI (kABI)
compatibility.

NO.8 Examine these statements and their output taken right after successful install of Oracle Linux:
[root@FAROUT /] rpm -q firstboot
Firstboot -1.110.10-1.0.2.e16.x86_64
[root @FAROUT /] # chkconfig - - list firstboot
Firstboot 0:off 2:off 3:off 4:off 5:off 6;off
[root@FAROUT /] # /etc/sysconfig/firstboot
RUN_FIRSTBOOT=NO
What is the conclusion?
A. The option to run firstboot was deselected during Oracle Linux installation.
B. The system was installed with desktop graphical packages and rebooted and the firstboot utility
ran successful.
C. Firstboot never ran in any run level because the service is turned off for all run levels.
D. The system was installed without selecting desktop graphical packages, thereby disabling
firstboot from running.
Answer: A

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Explanation:
Firstboot is set to off for all levels.
Example:
The rm command below remove or delate the firstboot file in order to make sure the firstboot
program running when we restart or reboot the Fedora machine.
[root@fedora ~]# rm /etc/sysconfig/firstboot
rm: remove regular file `/etc/sysconfig/firstboot'? y
[root@fedora ~]#
Then check and make sure that firstboot program or firstboot service is run when your Fedora
startup/boot up.
Check firstboot services
[root@fedora ~]# chkconfig --list firstboot
firstboot 0:off 1:off 2:off 3:off 4:off 5:off 6:off
[root@fedora ~]#

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Code d'Examen: 1z0-559
Nom d'Examen: Oracle (Oracle Virtual Desktop Infrastructure 3 Essentials)
Questions et réponses: 77 Q&As

Code d'Examen: 1Z0-060
Nom d'Examen: Oracle (Upgrade to Oracle Database 12c)
Questions et réponses: 150 Q&As

Code d'Examen: 1z1-485
Nom d'Examen: Oracle (Exadata Database Machine Models X3-2 and X3-8 Implementation Essentials)
Questions et réponses: 71 Q&As

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NO.1 Which three statements are true about Oracle Data Pump export and import operations?
A. You can detach from a data pump export job and reattach later.
B. Data pump uses parallel execution server processes to implement parallel import.
C. Data pump import requires the import file to be in a directory owned by the oracle owner.
D. The master table is the last object to be exported by the data pump.
E. You can detach from a data pump import job and reattach later.
Answer: A,B,D

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Explanation:
B: Data Pump can employ multiple worker processes, running in parallel, to increase job
performance.
D: For export jobs, the master table records the location of database objects within a dump file set.
/ Export builds and maintains the master table for the duration of the job. At the end of an export
job, the content of the master table is written to a file in the dump file set.
/ For import jobs, the master table is loaded from the dump file set and is used to control the
sequence of operations for locating objects that need to be imported into the target database.

NO.2 Identify three benefits of Unified Auditing.
A. Decreased use of storage to store audit trail rows in the database.
B. It improves overall auditing performance.
C. It guarantees zero-loss auditing.
D. The audit trail cannot be easily modified because it is read-only.
E. It automatically audits Recovery Manager (RMAN) events.
Answer: A,B,E

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Explanation:
A: Starting with 12c, Oracle has unified all of the auditing types into one single unit called Unified
auditing. You don't have to turn on or off all of the different auidting types individually and as a
matter of fact auditing is enabled by default right out of the box. The AUD$ and FGA$ tables have
been replaced with one single audit trail table. All of the audit data is now stored in Secure Files
table thus improving the overall management aspects of audit data itself.
B: Further the audit data can also be buffered solving most of the common performance related
problems seen on busy environments.
E: Unified Auditing is able to collect audit data for Fine Grained Audit, RMAN, Data Pump, Label
Security, Database Vault and Real Application Security operations.
Note:
* Benefits of the Unified Audit Trail
The benefits of a unified audit trail are many: / (B) Overall auditing performance is greatly improved.
The default mode that unified audit works is Queued Write mode. In this mode, the audit records
are batched in SGA queue and is persisted in a periodic way. Because the audit records are written
to SGA queue, there is a significant performance improvement.
/ The unified auditing functionality is always enabled and does not depend on the initialization
parameters that were used in previous releases
/ (A) The audit records, including records from the SYS audit trail, for all the audited components of
your Oracle Database installation are placed in one location and in one format, rather than your
having to look in different places to find audit trails in varying formats. This consolidated view
enables auditors to co-relate audit information from different components. For example, if an error
occurred during an INSERT statement, standard auditing can indicate the error number and the SQL
that was executed. Oracle Database Vault-specific information can indicate whether this error
happened because of a command rule violation or realm violation. Note that there will be two audit
records with a distinct AUDIT_TYPE. With this unification in place, SYS audit records appear with
AUDIT_TYPE set to Standard Audit.
/ The management and security of the audit trail is also improved by having it in single audit trail.
/ You can create named audit policies that enable you to audit the supported components listed at
the beginning of this section, as well as SYS administrative users. Furthermore, you can build
conditions and exclusions into your policies.
*Oracle Database 12c Unified Auditing enables selective and effective auditing inside the Oracle
database using policies and conditions. The new policy based syntax simplifies management of
auditing within the database and provides the ability to accelerate auditing based on conditions.
*The new architecture unifies the existing audit trails into a single audit trail, enabling simplified
management and increasing the security of audit data generated by the database.

NO.3 The trace files may be aggregated by using the trcess utility.

NO.4 What is the result of executing a TRUNCATE TABLE command on a table that has Flashback
Archiving enabled?
A. It fails with the ORA-665610 Invalid DDL statement on history-tracked message
B. The rows in the table are truncated without being archived.
C. The rows in the table are archived, and then truncated.
D. The rows in both the table and the archive are truncated.
Answer: B

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Explanation:
You cannot roll back a TRUNCATE TABLE statement, nor can you use a FLASHBACK TABLE statement
to retrieve the contents of a table that has been truncated.

NO.5 In your database, you want to ensure that idle sessions that are blocking active are
automatically terminated after a specified period of time.
How would you accomplish this?
A. Setting a metric threshold
B. Implementing Database Resource Manager
C. Enabling resumable timeout for user sessions
D. Decreasing the value of the IDLE_TIME resource limit in the default profile
Answer: D

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Explanation:
An Oracle session is sniped when you set the idle_time parameter to disconnect inactive sessions.
(It's only like sniping on ebay in that a time is set for an action to occur.)
Oracle has several ways to disconnect inactive or idle sessions, both from within SQL*Plus via
resources profiles (connect_time, idle_time), and with the SQL*net expire time parameter. Here are
two ways to disconnect an idle session:
Set the idle_time parameter in the user profile Set the sqlnet.ora parameter expire_time

NO.6 You notice a high number of waits for the db file scattered read and db file sequential read
events in the recent Automatic Database Diagnostic Monitor (ADDM) report. After further
investigation, you find that queries are performing too many full table scans and indexes are not
being used even though the filter columns are indexed.
Identify three possible reasons for this.
A. Missing or stale histogram statistics
B. Undersized shared pool
C. High clustering factor for the indexes
D. High value for the DB_FILE_MULTIBLOCK_READ_COUNT parameter
E. Oversized buffer cache
Answer: A,C,D

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Explanation:
D: DB_FILE_MULTIBLOCK_READ_COUNT is one of the parameters you can use to minimize I/O
during table scans. It specifies the maximum number of blocks read in one I/O operation during a
sequential scan. The total number of I/Os needed to perform a full table scan depends on such
factors as the size of the table, the multiblock read count, and whether parallel execution is being
utilized for the operation.

NO.7 Your multitenant container database (CDB) contains a pluggable database, HR_PDB. The
default permanent tablespace in HR_PDB is USERDATA. The container database (CDB) is open and
you connect RMAN.
You want to issue the following RMAN command:
RMAN > BACKUP TABLESPACE hr_pdb:userdata; Which task should you perform before issuing the
command?
A. Place the root container in ARHCHIVELOG mode.
B. Take the user data tablespace offline.
C. Place the root container in the nomount stage.
D. Ensure that HR_PDB is open.
Answer: A

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NO.8 Your database has the SRV1 service configured for an application that runs on middle-tier
application server. The application has multiple modules. You enable tracing at the service level by
executing the following command:
SQL > exec DBMS_MONITOR.SERV_MOD_ACT_TRACE_ENABLE ('SRV1');
The possible outcome and actions to aggregate the trace files are as follows:
1.The command fails because a module name is not specified.
2.A trace file is created for each session that is running the SRV1 service.
3.An aggregated trace file is created for all the sessions that are running the SRV1 service.

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Nom d'Examen: Oracle (Enterprise Linux System Administration)
Questions et réponses: 115 Q&As

Code d'Examen: 1z1-485
Nom d'Examen: Oracle (Exadata Database Machine Models X3-2 and X3-8 Implementation Essentials)
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NO.1 Identify two true statements about Virtual Network Computing (VNC). (Choose two.)
A. It is a client/server application.
B. It allows entire desktops to be displayed remotely.
C. It does not provide any protection to remote X connections.
D. It allows applications to be run remotely and displayed only locally.
E. It is used to connect to a remote Linux machine only from a Linux machine.
Answer: AB

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NO.2 You are logged in to server1 and want to allow remote connections to server1 through X Display
Manager Control Protocol (XDMCP). You change the entry "Enable=false" to "Enable=true" in the
"[xdmcp]" section of the gdm.conf configuration file.
To test the XDMCP configuration, you log in to station1 as smith and try to connect to server1 by using the
following command:
[smith@station1]$ X -query server1.example.com :1
What is the result?
A. A connection to the gdm display manager on server1.example.com would be established using direct
XDMCP.
B. A connection to the xdm display manager on server1.example.com would be established using direct
XDMCP.
C. A connection to the gdm display manager on server1.example.com would be established using indirect
XDMCP.
D. A connection to the xdm display manager on server1.example.com would be established using indirect
XDMCP.
Answer: A

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NO.3 You want to configure the display login program to display the face browser of user accounts for
system logon.
Which two display managers support this feature? (Choose two.)
A. gdm
B. kdm
C. twm
D. xdm
Answer: AB

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NO.4 You work for XYZ organization and are setting up a new Linux box. The organization wants the user's
data on the system to be safe even in the event of a crash of the root filesystem.
Which step do you think would help the administrator achieve the organization's objective?
A. Have /opt directory on its own filesystem with the filesystem being ext3.
B. Have /home directory on its own filesystem with the filesystem being ext3.
C. Have /var directory on its own filesystem and all other filesystems under / (root filesystem).
D. Have /usr directory on its own filesystem and all other filesystems under / (root filesystem).
Answer: B

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NO.5 While importing user accounts in bulk along with passwords using the newusers command, you noticed
that user passwords are saved in the /etc/shadow file in the crypt format.
How would you enable the newusers command to use the preferred MD5 format when writing passwords
to the /etc/shadow file?
A. Add the MD5_ENAB=yes line to the /etc/login.defs file.
B. Add the MD5_CRYPT yes line to the /etc/login.defs file.
C. Add the MD5_CRYPT_ENAB yes line to the /etc/login.defs file.
D. Add the MD5_CRYPT_ENAB yes line to the /etc/security/limits.conf file.
Answer: C

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NO.6 You have the default syslogd configuration in your system. You plugged in a USB keydrive into the
system.
Which command would help you to find the bus and the device number of the keydrive?
A. lsusb
B. lsmod
C. insmod
D. cat /proc/self/mounts
Answer: A

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NO.7 You are currently working in runlevel 3. The X server is configured correctly and the default runlevel is
set to 5 in the /etc/inittab file. To find the default desktop you issue the following command:
[root@server1]#cat /etc/sysconfig/desktop
[root@server1]#
You find the file empty. What will be the effect when you try to go to the runlevel 5?
A. The system defaults to kdm and launch KDE.
B. The system defaults to xdm and launch GNOME.
C. The system defaults to gdm and launch GNOME
D. The system will fail to log into the graphical mode.
Answer: C

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NO.8 You want to install the ieee80211 module on your Linux system. While building the module, you receive
the following error:
Make [2]: *** [ieee 80211-1.2.17/ieee80211_module.o] Error 1
Make [1]: *** [_module_/ieee80211-1.2.17] Error 2
Make [1]: Leaving directory '/usr/src/kernels/2.6.9-42.0.0.0.1.EL-i686'
Make: *** [modules] Error 2
What do you infer from this error?
A. The ieee80211 module conflicts with the current kernel version.
B. The dependency modules for ieee80211 are not installed on the system.
C. The ieee80211 module given is not supported by the machine architecture.
D. The kernel source package, which must be installed to compile external device drivers, is not installed
on the system.
Answer: D

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