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NEW QUESTION # 73
Which of the following cryptographic functions ensures a hard drive is encrypted when not in use?
Answer: D
Explanation:
LUKS (Linux Unified Key Setup) provides full-disk encryption, ensuring that the data on a hard drive is protected and unreadable when the system is powered off or the drive is not in use.
NEW QUESTION # 74
A Linux administrator observes low network throughput. The administrator gathers the following output:
$ ip link show eth0
eth0: < BROADCAST,MULTICAST,UP,RUNNING > mtu 9000 ...
$ ping -s 1472 -M do 192.168.10.2
PING 192.168.10.2(192.168.10.2) 1472(1500) bytes of data.
From 10.10.9.72 icmp_seq=1 frag needed and DF set
Which of the following is the cause of the low network throughput?
Answer: D
Explanation:
Network throughput issues are often caused by Maximum Transmission Unit (MTU) mismatches. MTU defines the largest packet size (in bytes) that can be sent over a network interface. According to CompTIA Linux+ V8 networking objectives, a standard Ethernet MTU is 1500 bytes. Larger values, such as 9000, are known as " Jumbo Frames " and must be supported by every device in the network path (switches, routers, and the destination host).
In this scenario, the output of ip link show eth0 reveals that the local interface is configured for an MTU of
9000. However, when the administrator runs a ping test with a payload of 1472 bytes (which, with headers, equals a 1500-byte packet) and the " Don ' t Fragment " (-M do) flag, the system returns an error: " frag needed and DF set " .
This error message indicates that a device somewhere in the network path has a smaller MTU (likely the standard 1500) and cannot handle the 9000-byte packets the server wants to send. Since the " Don ' t Fragment " bit is set, the device cannot break the packet down and instead drops it. This results in packet loss, retransmissions, and significantly lower throughput as the protocol tries to adapt.
Options A, B, and C are not supported by the provided evidence. A duplex mismatch (Option C) would typically show collisions or CRC errors in ifconfig or ip -s link. Driver or hardware issues would manifest as interface flaps or total connectivity loss. The explicit " frag needed " message is a definitive indicator of an MTU mismatch.
The resolution would be to either ensure Jumbo Frames are enabled throughout the network or lower the local MTU to 1500.
NEW QUESTION # 75
A Linux administrator needs to securely erase the contents of a hard disk. Which of the following commands is the best for this task?
Answer: C
Explanation:
Secure data destruction is an important security requirement addressed in Linux+ V8 objectives. When data must be permanently erased, standard file deletion commands are insufficient because they do not overwrite the data on disk.
The shred command is specifically designed to securely erase files or block devices by overwriting them multiple times with random data. Using sudo shred /dev/sda1 overwrites the entire partition, making data recovery extremely difficult or impossible. This aligns directly with Linux+ V8 best practices for secure data sanitization.
The other options are incorrect. rm -rf removes directory entries but does not overwrite disk data. parted rm deletes partition entries but leaves the underlying data intact. dd if=/dev/null writes zero bytes and does not overwrite existing data blocks.
Linux+ V8 documentation identifies shred as the most appropriate tool for secure erasure when compliance or confidentiality is required. Therefore, the correct answer is B.
NEW QUESTION # 76
A user reports Issues v/hen trying to connect to one ot the Linux servers. The server administrator reviews the following outputs:
Output 1:
Kernel panic not syncing: Fatal Machine check
Fid: 0, comm; swapper Tainted: G M ------------------ 4.18.0-553.8.1.cl8_10.x86_64 #1 Call Trace:
< #mc > [rrrrrrrrs:4er..i4i] ? panic+ox7n/oxi43
[] ? mcc_panic+0x21f/0x240
[] ? do_machine_check+0xal8/0xae0
[] ? intel idie+0xbi/0xi70
[] ? machino_check+0xlc/0x30
[] ? intel_idle+0xbl/0xl70
[] ? hrtimer 8tart+0xlB/0x20
[] ? cpuidle_idle_cail+0xa7/0xl40
I| ? cpu_idle+0xbfc/0xll0
[] ? Start_secondary+0x202/0x245
Output 2:
[325926.243631] mce: [Error] : CPU 22: Machine Check Exception: 7 Bank 0: bd80000000000134
1325926.247004| nice: (Error): Machine check events logged
[325991.358038] race: [Error] : KIP 10: < ffffffff83584719* (copy user enhanced fast strir.q+0x9/0x20)
[325991.358038] mce: [Error] : tsc 31ea89256a735 ADDR 3cdl889000 MISC 8c
[325991.350033] mce: [Error] : PROCESSOR 0:50657 TIME 15945B1695 SOCKET 0 APTC 16 microcode rrrrtrrr
[325991.358038] mce: [Error] : Run the above through ' rr.ccloq -ascii*
[325991.358038] mce: [Error] : Machine check: Action required: unknown MCACOD
[325991.3511038] Kernel panic not syncing: Fatal machine check
Which of the following statements describes the cause and resolution for this issue?
Answer: D
Explanation:
The correct answer is B because the log output is centered around a Machine Check Exception (MCE) and a kernel panic caused by a fatal machine check, which strongly indicates a hardware-level fault rather than a normal software or user-space problem. In Linux troubleshooting, messages such as "Kernel panic not syncing: Fatal Machine check" and "mce: [Error]: Machine Check Exception" are key indicators that the CPU or another hardware component has detected a serious condition that the operating system cannot safely recover from.
The stack trace references low-level CPU and kernel routines such as do_machine_check, machine_check, and intel_idle, which supports the conclusion that the processor is reporting a hardware exception. The repeated mce messages, CPU bank references, and the instruction to decode machine-check data are all consistent with diagnosing failures related to the processor, motherboard, cache, memory subsystem, or other platform hardware. This is not typical evidence of a corrupted kernel image.
Option A is incorrect because a corrupted kernel usually produces boot failures, module issues, missing files, or invalid execution states, not hardware-generated machine check exceptions. Option C is incomplete and therefore incorrect as the best answer, because while rebooting may restore temporary access, it does not resolve the underlying fault that triggered the panic. Option D is incorrect because CPU exhaustion would present as performance degradation, high load, or scheduling contention, not a machine-check panic.
The proper resolution is to escalate to the server or hardware support team for physical diagnostics. Likely follow-up actions include checking system health logs, firmware and microcode levels, ECC memory events, CPU status, motherboard diagnostics, and vendor hardware tools. The issue should be treated as a hardware reliability problem, not simply an operating system crash.
NEW QUESTION # 77
Which of the following Ansible components contains a list of hosts and host groups?
Answer: C
Explanation:
In Ansible, the inventory defines the list of managed nodes (hosts) and groups of hosts. It is the source from which Ansible knows what systems to configure or manage.
NEW QUESTION # 78
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