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Oracle Linux 6 Advanced System Administration

Question No: 1

Which two statements are true about the configuration ofkdumpfor capturing a dump image after a kernel crash?

  1. kdumpuseskexecto reboot the failed kernel and then captures a dump image.

  2. Thecrashkernelboot parameter must be added to thekernelline in the/boot/grub.conffile to enablekdump.

  3. The memory used forcrashkernelis always at the same physical address.

  4. kdumprequires no parameters because it is enabled by default.

  5. kdumpuseskexecto boot a second kernel, which then captures a dump image.

Answer: A,B

Question No: 2

Consider the features and capabilities of DTrace in Oracle Linux. Which two statements are true?

  1. DTrace is available on Oracle Linux only on the z86_64 platform.

  2. DTrace is available on all Linux platforms.

  3. The Linux kernel changes required to support DTrace, and the DTrace kernel module, are available under the GNU GPL license.

  4. DTrace package are part of the standard OL distribution, although they are not installed by default.

  5. DTrace package are available by subscription from the Unbreakable Linux Network (ULN).

Answer: A,D

Question No: 3

Examine thedtracecommand: dtrace -n syscall::read:entry Which two statements are true?

  1. This statement fails with a syntax error because no action is defined.

  2. This statement runs successfully with the default action being executed.

  3. The probe name isread.

  4. The probe name isentry.

  5. The probe name is not specified in this command, but it is implied through adjacent colons.

  6. This command runs but produces no output; is no predicate to select when the probe fires.

Answer: B,C

Question No: 4

Which command can be used to display the parameters of a given cgroup in thecpusetsubsystem?

  1. lscgroup | grep group | grep cpuset

  2. cgget -g cpuset cgroup

  3. lssubsys | grep group | grep cpuset

  4. cat /cgroup/cpuset/cgroup/params

Answer: C Explanation:

You can use the lssubsys command (which is included in the libcgroup package) to view the available kernel subsystems:

#lssubsys -am

cpuset cpu cpuacct memory devices freezer net_cls blkio

Question No: 5

For which domain or domains does the default cache-only nameserver have a list of authoritative servers in the/var/named/named.cafile?

  1. the domain to which the cache only nameserver belongs

  2. the root domain

  3. the domains to which the local DHCP servers belong

  4. the domains to which the local DNS servers belong

Answer: B

Question No: 6

Which two statements are true about thecpusetcgroup subsystem?

  1. It assigns individual CPUs and memory nodes for NUMA-enabled architectures to cgroup tasks.

  2. It assigns individual CPUs on a multicore system to cgroup tasks.

  3. It controls CPU scheduling according to relative CPU shares of cgroup tasks.

  4. It reports the total CPU time used by cgroup tasks.

Answer: A,C

Reference:http://www.oracle.com/technetwork/articles/servers-storage-admin/resource- controllers-linux-1506602.html

Question No: 7

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

  1. The container is isolated from the network.

  2. Avethdevice is added to libvirt’svirbr0bridge.

  3. Amacvlandevice enables DHCP from the host’s network.

  4. A private interface is routed to Open vSwitch.

Answer: B Explanation:

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 No: 8

Examine the parameters shown using thesysctlcommand relating to panic situations: [root@WAYOUT etc]# sysctl -a |grep panic |grep -v hung

kernel.panic = 0

kernel.panic_on_oops = 0

kernel.softlockup_panic = 0

kernel.unknown_nmi_panic = 0

kernel.panic_on_unrecovered_nmi = 0

kernel.panic_on_io_nmi = 0

kernel.panic_on_oom = 2

[root@WAYOUT etc]# sysctl -a |grep hung

kernel.hung_task_panic = 0

kernel.hung_task_chek_count – 4194304

kernel.hung_task_timeout_secs = 120

kernel.hung_task_warnings = 10

Which two statements are true about system behavior?

  1. The kernel delays panic for a few seconds if a bug is encountered to allow theklogdkernel logging daemon to log theoopsoutput.

  2. The kernel panics if a kernel thread sleeps in theTASK_UNINTERRUPTABLEstate for more than 120 seconds.

  3. The kernel attempts to continue if a bug is encountered.

  4. The kernel always panics if an out-of-memory condition arises.

  5. The kernel tries to kill some memory-consuming processes to avoid a panic if an out-of- memory condition arises.

  6. The kernel panics if a user thread sleeps in theTASK_UNINTERRUPTABLEstate for more than 120 seconds.

Answer: B,F

Question No: 9

You run thecrashutility on an Oracle Linux system after a kernel panic and use thebt – acommand as shown:

crashgt; bt -a

PID: 286TASK: c0b3a000CPU: 0COMMAND: “in.rlogind”

#0 [c0b3be90] crash_save_current_state at c011aed0

#1 [c0b3bea4] panic at c011367c

#2 [c0b3bee8] tulip_interrupt at c01bc820

#3 [c0b3bf08] handle_IRQ_event at c010a551

#4 [c0b3bf2c] do_8259A_IRQ at c010a319

#5 [c0b3bf3c] do_IRQ at c010a653

#6 [c0b3bfbc] ret_from_intr at c0109634 EAX:

00000000

EBX: c0e68280 ECX: 00000000 EDX: 00000004

EBP:

c0b3bfbc DS: 0018 ESI:

00000004

ES: 0018 EDI:

c0e68284

CS: 0010 EIP: c012f803 ERR:

Ffffff09 EFLAGS: 00000246

#7 [c0b3bfbc] sys_select at c012f803

#8 [c0b3bfc0] system_call at c0109598 EAX:

0000008e EBX: 00000004 ECX:

bfffc9a0 EDX: 00000000

DS: 002b ESI:

bfffc8a0 ES: 002b EDI:

00000000

SS: 002b ESP:

bfffc82c EBR:

bfffd224

CS 0023 EIP:

400d032e ERR: 0000008e

EFLAGS: 00000246

Which two statements are true about the purpose of thebt -acommand?

  1. It shows stack traces of all tasks and threads.

  2. It shows stack traces of the active task on each CPU.

  3. The output of each CPU must be requested separately.

  4. It may help show a relationship between panicking tasks on one CPU and tasks on other CPUs.

Answer: A,B

Question No: 10

Consider a cgroup configuration in the/etc/cgconfig.conffile: 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?

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

  2. Two cgroup hierarchies and threesubsystems are defined; cgroup A1 and A2 are located in different cgroup hierarchiers.

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

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

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

  6. Any user who is a member of theusersgroup is allowed to execute tasks in cgroups A1 and A2 and change thecpu.sharesparameter in cgroups A1 and A2.

Answer: B,D

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