1Z0-106 sample questions

Question 1

An administrator deploys a custom web service that is configured to listen on TCP port 8080. The service fails to start, and the `journalctl` logs show a "Permission denied" error when trying to bind to the port. The system is running in SELinux enforcing mode. The administrator confirms that `firewalld` is not blocking the port. What is the correct, persistent method to allow the web service to bind to port 8080?
```mermaid
flowchart TD
Start([Start]) --> CheckService{Service fails to start}
CheckService --> CheckLogs{journalctl}
CheckLogs --> |'Permission Denied'| IsSELinux{SELinux Enforcing?}
IsSELinux --> |Yes| IsFirewall{Firewall Blocking?}
IsFirewall --> |No| SELinuxPortContext{Check SELinux Port Context}
SELinuxPortContext --> Solution[Apply Correct Port Context]
Solution --> Restart[Restart Service]
Restart --> Success([Success])
```

Accepted Answer

Run `semanage port -a -t http_port_t -p tcp 8080`.

Answer

Run `setenforce 0` to temporarily disable SELinux.

Answer

Use `audit2allow` to create a custom policy module to allow the access.

Answer

Run `setsebool -P httpd_can_network_connect 1`.

Question 2

You are configuring a new Oracle Linux 8 server that will serve as a high-performance database node. The network team has provisioned a specific static IP address, gateway, and DNS servers. You need to configure the 'eno1' interface using `nmcli` in a single command line to minimize downtime. Which command successfully creates and activates this connection with the specified parameters?

Accepted Answer

nmcli con add type ethernet con-name db_net ifname eno1 ipv4.method manual ipv4.addresses 192.168.10.50/24 ipv4.gateway 192.168.10.1 ipv4.dns "10.10.10.1 10.10.10.2" && nmcli con up db_net

Answer

nmcli dev config eno1 ip4 192.168.10.50/24 gw4 192.168.10.1 dns 10.10.10.1,10.10.10.2 --activate

Answer

nmcli connection modify eno1 ipv4.addresses 192.168.10.50/24 ipv4.gateway 192.168.10.1 ipv4.dns 10.10.10.1 ipv4.method manual +up

Answer

ip addr add 192.168.10.50/24 dev eno1 && ip route add default via 192.168.10.1 && echo "nameserver 10.10.10.1" > /etc/resolv.conf

Question 3

A system administrator needs to configure a Virtual Data Optimizer (VDO) volume on an Oracle Linux 8 server to save space for a backup repository. The physical device is `/dev/sdb`. Which sequence of commands correctly creates a VDO volume named `vdo_backup` with a logical size of 50TB on this 10TB physical disk?

Accepted Answer

dnf install vdo kmod-kvdo; vdo create --name=vdo_backup --device=/dev/sdb --vdoLogicalSize=50T

Answer

pvcreate --vdo /dev/sdb; vgcreate vdo_vg /dev/sdb; lvcreate --type vdo --name vdo_backup --size 50T vdo_vg

Answer

mkfs.xfs -o dedupe=true,compress=lz4 /dev/sdb; xfs_growfs -d 50T /dev/sdb

Answer

vdo create --name=vdo_backup --device=/dev/sdb --deduplication=enabled --compression=enabled; lvextend -L 50T /dev/mapper/vdo_backup

Question 4

You are troubleshooting a performance issue on an Oracle Linux 8 web server. You suspect that the system is paging heavily to swap, causing latency. Which specific `sar` command and column would best confirm that pages are being actively swapped in and out of disk, rather than just normal memory allocation activity?

Accepted Answer

Command: `sar -W`; Columns: `pswpin/s` and `pswpout/s`

Answer

Command: `sar -r`; Columns: `kbSwpFree` and `kbSwpUsed`

Answer

Command: `sar -B`; Columns: `pgpgin/s` and `pgpgout/s`

Answer

Command: `sar -S`; Columns: `swp_used` and `swp_free`

Question 5

An administrator needs to analyze the boot time of an Oracle Linux 8 server to identify which services are slowing down the startup process. Which command provides a hierarchical view of the critical chain of units, highlighting the time each unit took to initialize and which units delayed the boot?

Accepted Answer

systemd-analyze critical-chain

Answer

systemd-analyze blame

Answer

journalctl -b --list-boots

Answer

systemctl list-dependencies --reverse

Question 6

You are managing an Oracle Linux 8 system and need to persistently modify a kernel parameter related to network performance. You want to ensure this setting survives reboots and takes precedence over default system settings. Which is the recommended location to create a new configuration file for this parameter?

Accepted Answer

/etc/sysctl.d/99-custom.conf

Answer

/usr/lib/sysctl.d/01-custom.conf

Answer

/etc/sysconfig/kernel

Answer

/proc/sys/net/ipv4/conf.d/custom

Question 7

A critical application requires the `xfs` filesystem on `/dev/mapper/data_vg-app_lv` to be expanded while mounted and online. The underlying logical volume has already been extended. Which command must be run to resize the filesystem to occupy the newly available space?

Accepted Answer

xfs_growfs /mnt/app_data

Answer

resize2fs /dev/mapper/data_vg-app_lv

Answer

xfs_admin --resize /dev/mapper/data_vg-app_lv

Answer

lvextend --resizefs /dev/mapper/data_vg-app_lv

Question 8

You have configured a custom service listening on TCP port 9090. SELinux is in Enforcing mode, and the service fails to bind to the port. You have identified that the port type `http_port_t` is appropriate for this service. Which command persistently adds port 9090 to the `http_port_t` SELinux policy?

Accepted Answer

semanage port -a -t http_port_t -p tcp 9090

Answer

chcon -t http_port_t --port 9090

Answer

firewall-cmd --add-port=9090/tcp --zone=public --permanent

Answer

setsebool -P httpd_use_custom_port 1

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Free 1Z0-106 sample questions

An administrator needs to analyze the boot time of an Oracle Linux 8 server to identify which services are slowing down the startup process. Which command provides a hierarchical view of the critical chain of units, highlighting the time each unit took to initialize and which units delayed the boot?

A critical application requires the `xfs` filesystem on `/dev/mapper/data_vg-app_lv` to be expanded while mounted and online. The underlying logical volume has already been extended. Which command must be run to resize the filesystem to occupy the newly available space?

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