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  1. Home
  2. Oracle Certification
  3. 1Z0-821 Exam
  4. Oracle.1Z0-821.v2024-03-21.q239 Dumps
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Question 56

Which two are implemented using the Internet Control Message Protocol (ICMP)?

Correct Answer: A,F
The Internet Control Message Protocol (ICMP) is one of the core protocols of the Internet Protocol Suite. ICMP differs from transport protocols such as TCP and UDP in that it is not typically used to exchange data between systems, nor is it regularly employed by end-user network applications (with the exception of some diagnostic tools like ping and traceroute).
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Question 57

Your SPARC server will not boot into multi user-server milestones and you need to troubleshoot to out why. You need to start the server with minimal services running so that you can go through each milestone manually to troubleshoot the issue.
Select the option that boots the server with the fewest services running.

Correct Answer: D
Explanation/Reference:
Explanation:
The command boot -m milestone=none is useful in repairing a system that have problems booting early.
Boot Troubleshooting:
To step through the SMF portion of the boot process, start with:
boot -m milestone=none
Then step through the milestones for the different boot levels:
svcadm milestone svc:/milestone/single-user:default
svcadm milestone svc:/milestone/multi-user:default
svcadm milestone svc:/milestone/multi-user-server:default
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Question 58

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

The server has two spate 140-GB disk drives: c3t5d0 c3t6d0
Which command would add redundancy to the pool1 storage pool?

Correct Answer: A
Explanation/Reference:
Explanation:
You can convert a non-redundant storage pool into a redundant storage pool by using the zpool attach command.
Note: zpool attach [-f] pool device new_device
Attaches new_device to an existing zpool device. The existing device cannot be part of a raidz configuration. If device is not currently part of a mirrored configuration, device automatically transforms into a two-way mirror of device and new_device. If device is part of a two-way mirror, attaching new_device creates a three-way mirror, and so on. In either case, new_device begins to resilver immediately.
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Question 59

Which three of the components could be used in a ZFS storage pool, but are not recommended configurations?

Correct Answer: A,B,E
A: ZFS also allows you to use UFS files as virtual devices in your storage pool. This feature is aimed primarily at testing and enabling simple experimentation, not for production use.
The reason is that any use of files relies on the underlying file system for consistency. If you create a ZFS pool backed by files on a UFS file system, then you are implicitly relying on UFS to guarantee correctness and synchronous semantics.
However, files can be quite useful when you are first trying out ZFS or experimenting with more complicated layouts when not enough physical devices are present. All files must be specified as complete paths and must be at least 64 Mbytes in size.
B, E: You can construct logical devices for ZFS using volumes presented by software- based volume managers, such as Solaris Volume Manager (SVM) or Veritas Volume Manager (VxVM). However, these configurations are not recommended. While ZFS functions properly on such devices, less-than-optimal performance might be the result.
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Question 60

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?

Correct Answer: E
Explanation/Reference:
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
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