1Z0-821 | What Certified 1Z0-821 braindumps Is?
Q81. - (Topic 2)
You need to migrate a UFS file system named /production_ufs to a ZFS file system named /production_ufs. The /production_ufs file system cannot be taken down or be out of production duringthe migration,and the current /production_ufs file system must remain active until the /ptoduction_zfs file system is copied and ready.
Which method allows you to meet both requirements?
1.
Copy live data from /production_ufs to /production_zfs while /production_ufs is in use.
2.
When the copy is complete,/production_zfs will contain an up-to date copy of /production_ufs
A. Create a snapshot of the UFS file system. Create the new ZFS file system. Use cpio to copy data from the snapshot to the new ZFS file system.
B. Create a new Boot Environment. Create the ZFS file system. Use lucreate -m to copy data from the Current UFS file system to the new ZFS file system.
C. Mirror the existing UFS file system by using SVM.After both submissions are in sync,migrate one of the submissions to a ZFS file System by using Live Upgrade.
D. Create the new ZFS file system by using zfs create import to import data from the existing UFS file system into the new ZFS file system
E. Create the new zfs file system by using the zfs create -o shadow.
Answer: E
Explanation:
Migrating Data With ZFS Shadow Migration ZFS shadow migration is a tool you can use to migrate data from an existing file system to a new file system. A shadow file system is created that pulls data from the original source as necessary.
You can use the shadow migration feature to migrate file systems as follows:
*
A local or remote ZFS file system to a target ZFS file system
*
A local or remote UFS file system to a target ZFS file system
Shadow migration is a process that pulls the data to be migrated:
*
Create an empty ZFS file system.
*
Set the shadow property on an empty ZFS file system,which is the target (or shadow) file
system,to point to the file system to be migrated.
For example:
# zfs create -o shadow=nfs://system/export/home/ufsdata users/home/shadow2
*
Data from file system to be migrated is copied over to the shadow file system.
Q82. - (Topic 1)
You are the administrator for a group of shell script developers. They use vi,and have
asked you to make their scripts automatically executable when they save their files.
How can this be accomplished?
A. Enter set –o vi on the command line,or include it in each user's startup script.
B. Enter umask –s on the command line,or include it in each user's startup script.
C. Enter umask 000 on the command line,or include it in each user's startup script.
D. Enter umask 777 on the command line,or include it in each user's startup script.
E. It is not possible to automatically set the execute bit on with the umask setting,or vi option.
F. Enter umask 766 the command line,or include it in the global startup script for the default shell.
Answer: E
Explanation:
Unlike DOS,which uses the file extension to determine if a file is executable or not,UNIX
relies on file permissions.
The value assigned by umask is subtracted from the default.
User's file creation mask. umask sets an environment variable which automatically sets file
permissions on newly created files. i.e. it will set the shell process's file creation mask to
mode.
umask 000 would grant full permissions.
Note: 777 full permissions
Q83. - (Topic 1)
Which network protocol provides connectionless,packet-oriented communication between applications?
A. TCP
B. UDP
C. IP
D. ICMP
E. NFS
F. IPSec
Answer: B
Explanation:
The User Datagram Protocol (UDP) is one of the core members of the Internet Protocol Suite,the set of network protocols used for the Internet. With UDP,computer applications can send messages,in this case referred to as datagrams,to other hosts on an Internet Protocol (IP) network without requiring prior communications to set up special transmission channels or data paths. Compared to TCP,UDP is a simpler message-based connectionless protocol.
Q84. - (Topic 2)
Select the packet type that identifies members of the group and sends information to all the network interfaces in that group.
A. Unicast
B. Multicast
C. Broadcast
D. Bayesian
E. Quality of Service Priority
Answer: B
Explanation:
IPv6 defines three address types:
unicast
Identifies an interface of an individual node.
multicast
Identifies a group of interfaces,usually on different nodes. Packets that are sent to the
multicast address go to all members of the multicast group.
anycast
Identifies a group of interfaces,usually on different nodes. Packets that are sent to the anycast address go to the anycast group member node that is physically closest to the sender.
Q85. - (Topic 2)
The line
set noexec_user_stack= l
should be added to the /etc/system file to prevent an executable stack while executing user programs. What is the purpose of this?
A. help prevent core dumps on program errors
B. help programs to execute more quickly by keeping to their own memory space
C. log any messages into the stack log
D. help make buffer-overflow attacks more difficult
Answer: D
Explanation:
How to Disable Programs From Using Executable Stacks
Purpose: Prevent executable stack from overflowing.
You must be in the root role.
Edit the /etc/system file,and add the following line:
set noexec_user_stack=1
Reboot the system.
# reboot
Q86. - (Topic 1)
Which two options are accurate regarding the non-global zone console?
A. Access the non-global zone console by using the zlogin –c command.
B. Access the non-global zone console by using the zlogin –1 command.
C. Disconnect from the non-global zone console by using the ~. keys.
D. Disconnect from the non-global zone console by using the #. keys.
Answer: A,C
Explanation:
A: How to Log In to the Zone Console Use the zlogin command with the -C option and the name of the zone,for example,my-zone. global# zlogin -C my-zone
C: To disconnect from a non-global zone,use one of the following methods.
*
To exit the zone non-virtual console: zonename# exit
*
To disconnect from a zone virtual console,use the tilde (~) character and a period: zonename# ~.
Q87. - (Topic 1)
_________ serves as the interface between the SMF repository and the user to ensure that a consistent,picture of the repository is presented to the user.
A. repository.db
B. service manifest
C. svc.startd
D. svc.configd
Answer: D
Explanation:
SVC.CONFIGD is the repository daemon responsible for maintaining /etc/svc/repository.db. The repository.db must come clean during this integrity check otherwise it is a "no go" for usual boot sequence to run level 3. The repository may get corrupted due to various hardware issues,software bugs,disk write failures,etc.
Note: When svc.configd(1M),the Solaris Repository Daemon,is started,it does an integrity check of the smf(5) repository,stored in /etc/svc/repository.db. This integrity check can fail due to a disk failure,the database file being corrupted either due to a hardware bug,a software bug,or an accidental overwrite. If the integrity check fails,svc.configd will write a message to the console.
Q88. - (Topic 2)
Which two options are valid methods of installing a solaris10 branded zone on a system running Oracle Solaris 11?
A. Use the V2V process to migrate an existing Solaris 8 or 9 non-global zone from a Solaris 10 system to a solaris10 branded zone.
B. Use the V2V process to migrate an existing Solaris 10 non-global whole root zone from a Solaris 10 system to a solaris10 branded whole root zone.
C. Install a solaris10 branded zone directly from the Oracle Solaris 10 media.
D. Migrate an existing 64-bit Solaris 10 system to a solaris10 branded non-global zone using the P2V process.
E. Use the V2V process to migrate an existing Solaris 10 non-global sparse root zone from a Solaris 10 system to a solaris10 branded sparse root zone.
Answer: B,C
Explanation:
B: How to Migrate an Existing native Non-Global Zone
Use the V2V process to migrate an existing zone on your Solaris 10 system to a solaris10 brand zone on a system running the Oracle Solaris 11 release.
C: How to Install the solaris10 Branded Zone
A configured solaris10 branded zone is installed by using the zoneadm command with the install subcommand.
Q89. - (Topic 2)
You are going to create live zones on you server. Disk space is critical on this server so you need to reduce the amount of disk space required for these zones. Much of the data required for each of these zones is identical,so you want to eliminate the duplicate copies of data and store only data that is unique to each zone.
Which two options provide a solution for eliminating the duplicate copies of data that is common between all of these zones?
A. Create the zones by using sparse root zones.
B. Set the dedup property to on and the dedupratio to at least 1.5 for the zpool.Create a separate ZFS file system for each zone in the zpool.
C. Put all of the zones in the same ZFS file system and set the dedupratio property for the ZFS file system to at least 1.5.
D. Put all of the zones in the same ZFS file system and set the dedup property for the file system to on.
E. Put each zone in a separate ZFS file system within the same zpool. Set the dedup property to on for each ZFS file system.
Answer: D,E
Explanation:
n Oracle Solaris 11,you can use the deduplication (dedup) property to remove redundant data from your ZFS file systems. If a file system has the dedup property enabled,duplicate data blocks are removed synchronously. The result is that only unique data is stored,and common components are shared between files.
Q90. - (Topic 2)
The crash dump notification on your server is:
Documentation states that there should be two core files for each crash dump in the /var/crash directory named vmdump.0
Which command should you choose to display theses two files?
A. savecore -f vmdump.0
B. dumpadm uncompressed
C. gunzip vmdump.0
D. dumpadm -z off
Answer: A
Explanation:
Decompress using savecore -f vmdump.0
savecore - save a crash dump of the operating system
-f dumpfile Attempt to save a crash dump from the speci-fied file instead of from the system's current dump device. This option may be use-ful if the information stored on the dump device has been copied to an on-disk file by means of the dd(1M) command.