Free Oracle 1Z0-820 Exam Practice Questions & Explanations

Last updated on: Oct 11, 2026
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Question 1

You run the command dlstat show-link -r.

Select the two correct statements regarding the information displayed in the INTRS column.

Answer Options
Correct Answer: C, E
Explanation

In this output, the statistics for interrupt (INTRS) are significant. Low interrupt numbers indicate greater efficiency in performance. If the interrupt numbers are high, then you might need to add more resources to the specific link.

Example:

# dlstat -r -i 1

LINK IPKTS RBYTES INTRS POLLS CH<10 CH10-50 CH>50

e1000g0 101.91K 32.86M 87.56K 14.35K 3.70K 205 5

nxge1 9.61M 14.47G 5.79M 3.82M 379.98K 85.66K 1.64K

vnic1 8 336 0 0 0 0 0

e1000g0 0 0 0 0 0 0 0

nxge1 82.13K 123.69M 50.00K 32.13K 3.17K 724 24

vnic1 0 0 0 0 0 0 0

...

Note: dlstat show-link [-r [-F] | -t] [-i interval] [-a] [-p] [ -o field[,...]] [-u R|K|M|G|T|P] [link]

Display statistics for a link.

-r

Display receive-side statistics only. Includes bytes and packets received, hardware and software drops, and so forth.

List of supported RX fields:

link

iusedby

ibytes

ipkts

intrs

polls

hdrops: hardware drops

sdrops: software drops (owing to bandwidth enforcement)

ch<10: number of packet chains of length < 10

ch10-50: number of packet chains of length between 10 and 50

ch>50: number of packet chains of length > 50

Incorrect answers:

Not A, not B: Example:

Display rx side statistics

# dlstat -r

LINK IPKTS IBYTES INTRS POLLS HDRPS SDRPS CH<10 CH10-50 CH>50 UTIL

e1000g0 21.2K 2.1M 22.3K 78.0 0.0 0.0 57.0 0.0 0.0 0.0%

nxge0 24.5M 13.6G 0.8K 10.7M 0.0 0.0 0.3M 2.96M 32.5K 0.0%

vnic1 24.5M 13.6G 0.8K 10.7M 0.0 0.0 0.3M 2.96M 32.5K 0.0%

Question 2

Which three installation options allow for a "hands-free" and "unattended" installation of the Oracle Solaris 11 environment?

(Choose three.)

Answer Options
Correct Answer: D, E, F
Question 3

You have already generated a 256-bit AES raw key and named the keystore file /mykey. You need to use the key to create an encrypted file system.

Which command should you use to create a ZFS encrypted file system named pool1/encrypt using the /mykey keystore?

Answer Options
Correct Answer: B
Explanation

Example: Encrypting a ZFS File System by Using a Raw Key

In the following example, an aes-256-ccm encryption key is generated by using the pktool command and is written to a file, /cindykey.file.

# pktool genkey keystore=file outkey=/cindykey.file keytype=aes keylen=256

Then, the /cindykey.file is specified when the tank/home/cindy file system is created.

# zfs create -o encryption=aes-256-ccm -o keysource=raw,file:///cindykey.file tank/home/cindys

Question 4

You upgraded your server to Oracle bolans 11 and you imported a zpool(pooll) that was created in bolaris 10. You need to create an encrypted ZFS file system in pooll, but first you need to make sure that your server supports ZFS encryption.

Which four statements are true for support of ZFS encryption?

Answer Options
Correct Answer: A, B, C, F
Question 5

Which four statements describe the function of the svc://system/install/server;default service? (Choose four.)

Answer Options
Correct Answer: E, F, G, H