Oracle Oracle Certifications 1Z0-105 Questions & Answers

• Question 141:

  You have an unmounted btrfs file system: # btrfs filesystem show Label: ‘Btrfs’ uuid: 7bfe3239-47ee-442b-b9f8-49f88b6b1be4 Total devices 3 FS bytes used 300.51MB devid 2 size 4.88GB used 1.06GB path /dev/sdd devid 1 size 4.88GB used 580.00GB path /dev/sdc devid 3 size 4.88GB used 1.50GB path /dev/sdb You have these mounted devices: # df –h

  

  You have a mount point for the btrfs file system:

  # ls -all /btrfs

  total 0

  drwxr-xr-x. 1 root root 0 Aug 12 10:17 .

  dr-xr-xr-x. 1 root root 276 Aug 12 10:36 ..

  Examine these steps:

  1.

  Manual defragment is not needed. Btrfs will defragment it automatically.

  2.

  btrfs device defragment /dev/sdd

  3.

  btrfs filesystem defragment /btrfs

  4.

  btrfs device delete /dev/sdb /btrfs

  5.

  mount UUID=7bfe3239-47ee-442b-b9f8-49f88b6b1be4 /btrfs

  6.

  btrfs device delete /dev/sdb /dev/sdd

  What is the correct order to delete the /dev/sdb device from the btrfs file system and for defragmenting the reduced file system?

  A. 6, 1

  B. 5, 4, 3

  C. 5, 6, 4, 3

  D. 5, 6, 1

  E. 4, 2

  Correct Answer: B

• Question 142:

  What statement is true about udev?

  A. It uses predefined kernel devices in /dev for all combinations of that may be connected to a system to support dynamic device name assignment.

  B. It dynamically creates kernel devices for only those devices that are connected.

  C. It produces persistent device names for all devices.

  D. Its configuration is based on device properties and attributes maintained in devfs.

  Correct Answer: B

  Reference: http://www.linuxfromscratch.org/lfs/view/development/chapter07/udev.html

• Question 143:

  Which statement is true about the net_cls cgroup subsystem?

  A. It controls the throughput limits for network packets.

  B. It dynamically sets the priority of network traffic per network interface.

  C. It enforces a limit on the number of opened sockets.

  D. It tags network packets with an identifier.

  Correct Answer: D

  Reference: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/ Resource_Management_Guide/

• Question 144:

  You want to create a new LUN, LUN ID =1, on a new target, target ID = 2. Inspect the current state of targets and LUNs in the output from tgt-admin –s. The output is filtered to show only target and LUN associations. [root@EDFAR9P0 init.d]# tgt-admin –s | egrep –i ‘target|lun’ Target 1: iqn.2013-03.com.example.mypc:1 LUN information: LUN: 0 LUN: 1 LUN: 2 LUN: 3

  You want to add a new LUN to a new target by using the /iSCSIsharedDisk/physDisk4.img disk image file.

  Which two options would you use to do this?

  A. tgt-setup-lun –t 2 tgt-setup-lun –d /iSCSIsharedDisk/physDisk4.img –t 2

  B. tgt-setup-lun –d /iSCSIsharedDisk/physDisk4.img –n 2

  C. tgt-admin --op new \ --mode target \ --tid 2\ --targetname iqn.2013-03.com.example.mypc:2 tgt-admin --op new \

  D. --mode logicalunit \ --tid 2 \ --lun 1 \ --backing-store /iSCSIsharedDisk/physDisk4.img

  E. tgtadm -- op new \ --mode target \ --tid 2\ --targetname iqn.2013-03.com.example.mypc:2 \ --lun 1 \ --backing-store /iSCSIsharedDisk/physDisk4.img

  F. tgt-admin –d /iSCSIsharedDisk/physDisk4.img –n 2

  Correct Answer: AE

• Question 145:

  Consider a cgroup configuration in the /etc/cgconfig.conf file:

  mount {

  cpuset = /cgroup/A;

  cpu = /cgroup/A;

  cpuacct = /cgroup/cpuacct;

  }

  group A1 {

  perm {

  admin {

  uid = root;

  gid = wheel;

  }

  task {

  uid = root;

  gid = users;

  }

  }

  cpuset {

  cpuset.mems="0";

  cpuset.cpus="0";

  }

  cpu {

  cpu.shares="5";

  }

  }

  group A2 {

  perm {

  admin {

  uid = root;

  admin {

  uid = root

  gid = root;

  }

  task {

  uid = root;

  gid = users;

  }

  }

  cpuset {

  cpuset.mems="0";

  cpuset.cpus="1";

  }

  cpu {

  cpu.shares="5";

  }

  }

  Which two statements are true?

  A. Two cgroup hierarchies and three subsystems are defined; cgroup A1 and A2 are located in the same sgroup hierarchy.

  B. Two cgroup hierarchies and three subsystems are defined; cgroup A1 and A2 are located in different cgroup hierarchiers.

  C. Three cgroup hierarchies and three subsystems are defined; cgroup A1 and A2 are located in the same sgroup hierarchy.

  D. Three cgroup hierarchies and three subsystems are defined; cgroup A1 and A2 are located in different cgroup hierarchiers.

  E. Any user who is a member of the users group is allowed to move his or her own tasks from the root cgroup to cgroup A1 or cgroup A2.

  F. Any user who is a member of the users group is allowed to execute tasks in cgroups A1 and A2 and change the cpu.shares parameter in cgroups A1 and A2.

  Correct Answer: BD

• Question 146:

  Examine the dtrace command.

  dtrace q n syscall:::

  Which two statements are true?

  A. The command produces minimal output, but this includes the CPU on which the probe fires, the probe ID, and the probe name.

  B. The dtrace command matches with all probes in the syscall provider.

  C. The -q option is invalid when not used with an explicit action, as in this case.

  D. The probe name specification is incorrect and does not match with any probes. This produces an "invalid probe specifier syscall:::" error message.

  E. The command produces no output.

  Correct Answer: DE

• Question 147:

  Which statement describes the default network set up by an Oracle template script?

  A. The container is isolated from the network.

  B. A veth device is added to libvirt's virbr0 bridge.

  C. A macvlan device enables DHCP from the host's network.

  D. A private interface is routed to Open vSwitch.

  Correct Answer: B

  By default, the lxc-oracle template script sets up networking by setting up a veth bridge. In this mode, a container obtains its IP address from the dnsmasq server that libvirtd runs on the private virtual bridge network (virbr0) between the container and the host. The host allows a container to connect to the rest of the network by using NAT rules in iptables, but these rules do not allow incoming connections to the container. Both the host and other containers on the veth bridge have network access to the container via the bridge.

• Question 148:

  Which three statements are true about support for the XFS file system in Oracle Linux?

  A. It is a journaling, extend-based file system.

  B. It is not supported for the /boot file system.

  C. It is supported for the root (/) file system.

  D. It supports user and group disk quotas.

  E. It is supported only when created on Logical Volumes.

  F. It has a built-in volume manager.

  Correct Answer: BDF

  Reference: http://docs.oracle.com/cd/E37670_01/E37355/html/ol_about_xfs.html

• Question 149:

  Identify the two commands that can be used to set SELinux file labels back to their default values.

  A. chcon

  B. fixfiles

  C. semanage fcontext

  D. restorecon

  E. matchpathcon

  F. opdate_selinux

  Correct Answer: AD

• Question 150:

  Examine the udevadm command:

  udevadm info --attribute-walk --name =/dev/sdb

  Which two statements are true about this command/

  A. It displays the device tree, and all attributes maintained in devfs for all parent devices in the device tree for the /dev/sdb disk device.

  B. The attributes listed by this command can be used in udev device naming rules.

  C. It displays the device naming rules that were used to name the device as /dev/sdb.

  D. It displays the device tree, and all attributes maintained in sysfs for all parent devices in the device tree for the /dev/sdb disk device.

  E. It displays all attributes maintained in sysfs for the /dev/sdb kernel device, excluding parent devices.

  F. It displays all attributes maintained in devfs for the /dev/sdb kernel device, excluding parent devices.

  Correct Answer: CD