Oracle 1Z0-821 Braindumps 2021

NEW QUESTION 1
User1 is attempting to assist user2 with terminating user2's process 1234. User1 entered the following: kill -9 1234
Why does the process continue to run?

• A. You can kill a process only if you are root.
• B. You can kill only a process that you own.
• C. You can kill the process only with the pkill command.
• D. You need to kill the process with a stronger kill signal.

Answer: B

Explanation: Kill -9
Kill (terminates without cleanup)
Only works if issued by process owner or super user (root) The program cannot respond to this signal; it must terminate
Note: Unix provides security mechanisms to prevent unauthorized users from killing other processes. Essentially, for a process to send a signal to another, the owner of the signaling process must be the same as the owner of the receiving process or be the superuser.

NEW QUESTION 2
zone1 is a non-global zone that has been configured and installed.
zone1 was taken down for maintenance, and the following command was run: zoneadm -z zone1 mark incomplete
The following information is displayed when listing the zones on your system:

Which task needs to be performed before you can boot zone1?

• A. The zone needs to be installed.
• B. The zone needs to be brought to the ready state.
• C. The zone needs to be uninstalled and reinstalled.
• D. The zone needs to be brought to the complete state.

Answer: C

Explanation: If administrative changes on the system have rendered a zone unusable or inconsistent, it is possible to change the state of an installed zone to incomplete.
Marking a zone incomplete is irreversible. The only action that can be taken on a zone marked incomplete is to uninstall the zone and return it to the configured state.

NEW QUESTION 3
Select the five tasks that need to be performed on the Automated Installer (AI) install server before setting up the client.

• A. Create a local IPS repository on the AI Install server and start the repository server service, the publisher origin to the repository file.
• B. Set up a IP address on the AI install server.
• C. The DHCP server must be enabled on the install server and must provide the DHCP service for the clients.
• D. DHCP must be available on the network for the Install server and the clients, but the install server does not need to be the DHCP server.
• E. Download the AI boot imag
• F. The image must be the same version as the Oracle Solaris OS that you plan to install on the client.
• G. Download the text install image into the IPS repository.
• H. Install the AI installation tools.
• I. Create the AI install servic
• J. Specify the path to the AI network boot image ISO file and the path where the AI net image ISO file should be unpacked.
• K. Create the AI install servic
• L. Specify the path to the AI network boot image ISO file and the path to the IPS repository.

Answer: BDFGI

Explanation: B: Configure the AI install server to use a static IP address and default route.
D: The create-service command can set up DHCP on the AI install server. If you want to set up a separate DHCP server or configure an existing DHCP server for use with AI. The DHCP server must be able to provide DNS information to the systems to be installed.
E: An automated installation of a client over the network consists of the following high-level steps:
1. The client system boots over the network and gets its network configuration and the location of the install server from the DHCP server.
2. The install server provides a boot image to the client.
3. Characteristics of the client determine which installation instructions and which system configuration instructions are used to install the client.
4. The Oracle Solaris 11 OS is installed on the client, pulling packages from the package repository specified by the installation instructions in the AI install service.
G: Install the AI tool set.
Use the installadm create-service command to create an AI install service. Give the service a meaningful name, and specify the path where you want the service created. Specify the source of the network boot image (net image) package or ISO file.
installadm create-service [-n svcname] [-s FMRI_or_ISO] [-d imagepath]
-d imagepath
The imagepath is the location of the new install service. The install-image/solaris-auto- install package is installed to this location, or the specified ISO file is expanded at this location.

NEW QUESTION 4
Your mentor suggests using the dladm rename-link command to rename the network datalinks.
What are the two advantages of following this advice?

• A. It can clarify which network interface has what purpose.
• B. It can simplify specifying the network interface with the dladm modify-aggr command.
• C. It can simplify specifying the network interface with the dladm modify-bridge command.
• D. It can simplify IP filter rule changes if the network interface is replaced with a different type.
• E. It can prevent accidental deletion of the network interface with the dladm delete-phys command.
• F. It can prevent accidental deletion of the network interface configuration with the ipadm delete-addr command.

Answer: AD

Explanation: Note: dladm rename-link [-R root-dir] link new-link
Rename link to new-link. This is used to give a link a meaningful name, or to associate existing link configuration such as link properties of a removed device with a new device.

NEW QUESTION 5
Examine this command and its output:
$ zfs list -r -t all tank
Name USED AVAIL REFER MOUNTPOINT
tank 3.00G 1.84G 32K /tank
tank/database 3.00G 1.84G 2.00G /tank/database tank/[email protected] 1.00G - 2.00G –
Which two conclusions can be drawn based on this output?

• A. The tank dataset consumes 3 GB of storage.
• B. The tank/[email protected] dataset consumes 1 GB of storage that is shared with its parent.
• C. The tank/[email protected] dataset consumes 1 GB of storage that is not shared with its parent.
• D. The tank/[email protected] dataset consumes 2 GB of storage that is shared with its child.
• E. The tank/[email protected] dataset consumes 2 GB of storage that is not shared with its child.

Answer: AB

NEW QUESTION 6
Before booting testzone, a non-global zone, you want to connect to the zone's console so that you can watch the boot process.
Choose the command used xo connect to testzone's console.

• A. zoneadm – C testzone
• B. zoneadm – console testzone
• C. zlogin – z testzone console
• D. zlogin – z testzone – C
• E. zlogin – C testzone
• F. zoneadm – z testzone – C

Answer: E

NEW QUESTION 7
Which two capabilities are provided by the OpenBoot PROM?

• A. a command to safely shut down the system
• B. hardware testing and initialization
• C. booting from a disk or network
• D. starting the GRUB loader

Answer: BC

Explanation: OpenBoot firmware is executed immediately after you turn on your system. The primary tasks of OpenBoot firmware are to:
* Test and initialize the system hardware (B)
* Determine the hardware configuration
*Boot the operating system from either a mass storage device or from a network (C)
*Provide interactive debugging facilities for testing hardware and software

NEW QUESTION 8
You have a ZFS file system named /dbase/oral and you want to guarantee that 10 GB of storage space is available to that dataset for all data, snapshots, and clones.
Which option would you choose?

• A. zfs set refreservation=10g dbase/oral
• B. zfs set quota=10g dbase/oral
• C. zfs set refquota=10g dbase/oral
• D. zfs set reservation=10g dbase/oral

Answer: D

Explanation: A ZFS reservation is an allocation of disk space from the pool that is guaranteed to be available to a dataset. As such, you cannot reserve disk space for a dataset if that space is not currently available in the pool. The total amount of all outstanding, unconsumed reservations cannot exceed the amount of unused disk space in the pool. ZFS reservations can be set and displayed by using the zfs set and zfs get commands. For example:
# zfs set reservation=5G tank/home/bill
# zfs get reservation tank/home/bill NAME PROPERTY VALUE SOURCE
tank/home/bill reservation 5G local

NEW QUESTION 9
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:defaultsetprop config_params/shadow_threads=integer: 16endsvcadm refresh filesystem/shadowd: default
• B. Specify the -b <blocksize> option with the zfs create command and increase the value of<blocksize>
• C. Use the -o -volblocksize=<blocksize>option with the zfs create command and increase the value of the default <blocksize>.
• D. Svccfg -s filesystem/zfs: defaultsetprop config_params/shadow_threads = integer: 16endsvcadm refresh filesystem/zfs:default

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

NEW QUESTION 10
You wish to troubleshoot some issues that you are having on the system. You want to monitor the /var/adm/messages file in real time. Which command would you use to do this?

• A. head
• B. tail
• C. cat
• D. file
• E. test

Answer: B

Explanation: tail is a program on Unix and Unix-like systems used to display the last few lines of a text file or piped data.
By default, tail will print the last 10 lines of its input to the standard output. With command line options the number of lines printed and the printing units (lines, blocks or bytes) may be changed. The following example shows the last 20 lines of filename:
tail -n 20 filename

NEW QUESTION 11
You log in to the system as user1, then switch user to root by using the su - command. After entering the correct password, yon enter the following commands:
whoami;who am i;id
Which option correctly represents the output?

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Answer: B

Explanation: * The whoami utility displays your effective user ID as a name. Here this would be root.
* who am i
The command who shows who is logged on. Here this would be:
user1 console Dec 30 20:20
* The id utility displays the user and group names and numeric IDs, of the calling process, to the standard output. If the real and effective IDs are different, both are displayed, otherwise only the real ID is displayed.
Here this would be: uid=0(root) gid=0(root)
Note:
Each UNIX proces has 3 UIDs associated to it. Superuser privilege is UID=0.
Real UID
--------
This is the UID of the user/process that created THIS process. It can be changed only if the running process has EUID=0.
Effective UID
-------------
This UID is used to evaluate privileges of the process to perform a particular action. EUID can be change either to RUID, or SUID if EUID!=0. If EUID=0, it can be changed to anything.
Saved UID
---------
If the binary image file, that was launched has a Set-UID bit on, SUID will be the UID of the owner of the file. Otherwise, SUID will be the RUID.

NEW QUESTION 12
The following information is displayed for the svc:/network/ssh service:

Which describes the minimum set of commands to be executed to bring the svc:
/network/ssh: default service back online?

• A. Option A
• B. Option B
• C. Option C
• D. Option D
• E. Option E
• F. Option F
• G. Option G

Answer: C

NEW QUESTION 13
Which option would you choose to display the kernel revision level for your operating system?

• A. ca
• B. /etc/release
• C. uname -a
• D. pkg info kernel
• E. banner (issued from the OpenBoot Prom)
• F. cat /etc/motd

Answer: B

NEW QUESTION 14
View the Exhibit to see the information taken from the installation log file.
Based on the information presented in the Exhibit, which two options describe the state of the system when the server is booted for the first time after the installation is complete?

• A. NWAM will be used to configure the network interface.
• B. The network/physical service is offline.
• C. You cannot log in from the console as roo
• D. You must first log in as a user and then su to root account.
• E. The root user can log in from the console login.
• F. You will be prompted to configure the network interface after the initial login.

Answer: BD

NEW QUESTION 15
Which two options are characteristics of a fast reboot?

• A. A fast reboot bypasses grub.
• B. A fast reboot cannot be used after a system panic on the x86 platform.
• C. A fast reboot can only be executed on the SPARC platform when the config/fastreboot_default property for the svc:/system/boot-config:default service is set to true.
• D. A fast reboot uses an in-kernel boot loader to load the kernel into memory.
• E. A fast reboot is the default on all platforms.

Answer: CD

Explanation: C: To change the default behavior of the Fast Reboot feature on the SPARC platform, so that a fast reboot is automatically performed when the system reboots, see below.
The following example shows how to set the property's value to true on the SPARC platform, so that a fast reboot is initiated by default:
# svccfg -s "system/boot-config:default" setprop config/fastreboot_default=true
# svcadm refresh svc:/system/boot-config:default
D: Fast Reboot implements an in-kernel boot loader that loads the kernel into memory and then switches to that kernel.
The firmware and boot loader processes are bypassed, which enables the system to reboot within seconds.
The Fast Reboot feature is managed by SMF and implemented through a boot configuration service, svc:/system/boot-config. The boot-config service provides a means for setting or changing the default boot configuration parameters. When the config/fastreboot_default property is set to true, the system performs a fast reboot automatically, without the need to use the reboot -f command. This property's value is set to true on the x86 platform. For task-related information, including how to change the default behavior of Fast Reboot on the SPARC platform, see Accelerating the Reboot Process on an x86 Based System.
Note: One new feature, called Fast Reboot, will allow the system to boot up without doing the routine set of hardware checks, a move that can make system boot times up to two- and-a-half times faster, Oracle claimed. This feature can be handy in that an administrator applying a patch or software update across thousands of Solaris deployments can reboot them all the more quickly.

NEW QUESTION 16
Select two correct statements about the authentication services available in Oracle Solaris 11.

• A. Pluggable Authentication Modules (PAM) is used to control the operation of services such console logins and ftp.
• B. The Secure Shell can be configured to allow logins across a network to remote servers without transmitting passwords across the network.
• C. Secure Remote Procedure Calls (Secure RPC) provides a mechanism to encrypt data on any IP Socket connection.
• D. Pluggable Authentication Modules (PAM) is used to implement the Secure Shell in Oracle Solaris 11.
• E. Simple Authentication and Security Layer (SASL) provides a mechanism to authenticate and encrypt access to local file system data.

Answer: AE

Explanation: A: Pluggable Authentication Modules (PAM) are an integral part of the authentication mechanism for the Solaris. PAM provides system administrators with the ability and flexibility to choose any authentication service available on a system to perform end-user authentication.
By using PAM, applications can perform authentication regardless of what authentication method is defined by the system administrator for the given client.
PAM enables system administrators to deploy the appropriate authentication mechanism for each service throughout the network. System administrators can also select one or multiple authentication technologies without modifying applications or utilities. PAM insulates application developers from evolutionary improvements to authentication technologies, while at the same time allowing deployed applications to use those improvements.
PAM employs run-time pluggable modules to provide authentication for system entry services.
E: The Simple Authentication and Security Layer (SASL) is a method for adding authentication support to connection-based protocols.
Simple Authentication and Security Layer (SASL) is a framework for authentication and data security in Internet protocols. It decouples authentication mechanisms from application protocols, in theory allowing any authentication mechanism supported by SASL to be used in any application protocol that uses SASL. Authentication mechanisms can also support proxy authorization, a facility allowing one user to assume the identity of another. They can also provide a data security layer offering data integrity and data confidentiality services. DIGEST-MD5 provides an example of mechanisms which can provide a data-security layer. Application protocols that support SASL typically also support Transport Layer Security (TLS) to complement the services offered by SASL.

NEW QUESTION 17
You are asked to determine user jack’s default login directory. Which command would provide you with useful information?

• A. cat /etc/passwd | grep jack
• B. cat /etc/group | grep jack
• C. cat /etc/shadow | grep jack
• D. cat /etc/default/passwd | grep jack

Answer: A

Explanation: The /etc/passwd contains one entry per line for each user (or user account) of the system. All fields are separated by a colon (:) symbol. Total seven fields as follows.
1. Username: It is used when user logs in. It should be between 1 and 32 characters in length.
2. Password: An x character indicates that encrypted password is stored in /etc/shadow file.
3. User ID (UID): Each user must be assigned a user ID (UID). UID 0 (zero) is reserved for root and UIDs 1-99 are reserved for other predefined accounts. Further UID 100-999 are reserved by system for administrative and system accounts/groups.
4. Group ID (GID): The primary group ID (stored in /etc/group file)
5. User ID Info: The comment field. It allow you to add extra information about the users such as user's full name, phone number etc. This field use by finger command.
6. Home directory: The absolute path to the directory the user will be in when they log in. If this directory does not exists then users directory becomes /
7. Command/shell: The absolute path of a command or shell (/bin/bash). Typically, this is a shell. Please note that it does not have to be a shell.