QUESTION: 165

In which of the following media rotation schemes are daily, weekly, and monthly backup media utilized in a first-in, first-out method?

Waterfall
Synthetic full
Tower of Hanoi
Grandfather-father-son

Answer(s): D

Explanation:

Grandfather-father-son (GFS) is a common backup rotation scheme that uses daily, weekly, and monthly backup media in a first-in, first-out (FIFO) method. The daily backups are rotated on a 3- months basis using a FIFO system as above. The weekly backups are similarly rotated on a bi-yearly basis, and the monthly backups are rotated on an annual basis. The oldest backup media in each cycle are overwritten by the newest ones. This scheme provides multiple versions of backup data at different intervals, allowing for flexible restoration options. Waterfall is another name for GFS. Synthetic full is a backup method that combines an initial full backup with subsequent incremental backups to create a new full backup without transferring all data again. Tower of Hanoi is another backup rotation scheme that uses an algorithm based on moving disks between three pegs.

Reference:

https://en.wikipedia.org/wiki/Backup_rotation_scheme

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QUESTION: 166

The HIDS logs on a server indicate a significant number of unauthorized access attempts via USB devices at startup.
Which of the following steps should a server administrator take to BEST secure the server without limiting functionality?

Set a BIOS/UEFI password on the server.
Change the boot order on the server and restrict console access.
C Configure the host OS to deny login attempts via US
Disable all the USB ports on the server.

Answer(s): B

Explanation:

Changing the boot order on the server and restricting console access would prevent unauthorized access attempts via USB devices at startup, as the server would not boot from any external media and only authorized users could access the console. Setting a BIOS/UEFI password on the server would also help, but it could be bypassed by resetting the CMOS battery or using a backdoor password. Configuring the host OS to deny login attempts via USB would not prevent booting from a malicious USB device that could compromise the system before the OS loads. Disabling all the USB ports on the server would limit functionality, as some peripherals or devices may need to use them.

Reference:

https://www.pcmag.com/how-to/dont-plug-it-in-how-to-prevent-a-usb-attack https://www.techopedia.com/definition/10362/boot-order https://www.techopedia.com/definition/10361/console-access https://www.techopedia.com/definition/102/bios-password https://www.techopedia.com/definition/10363/cmos-battery

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QUESTION: 167

A server administrator wants to ensure a storage array can survive the failure of two drives without the loss of dat

Which of the following RAID levels should the administrator choose?
0
1
5
6

Answer(s): D

Explanation:

RAID 6 is a level of RAID that can survive the failure of two drives without the loss of data. RAID 6 uses block-level striping with two parity blocks distributed across all member disks. RAID 6 can tolerate two simultaneous drive failures and still provide data access and redundancy. RAID 0 is a level of RAID that uses striping without parity or mirroring, and offers no fault tolerance. RAID 0 cannot survive any drive failure without data loss. RAID 1 is a level of RAID that uses mirroring without parity or striping, and offers fault tolerance by duplicating data on two or more disks. RAID 1 can survive one drive failure without data loss, but not two. RAID 5 is a level of RAID that uses block- level striping with one parity block distributed across all member disks. RAID 5 can tolerate one drive failure without data loss, but not two.

Reference:

https://en.wikipedia.org/wiki/Standard_RAID_levels

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QUESTION: 168

A senior administrator instructs a technician to run the following script on a Linux server:
for i in {1..65536); do echo Si; telnet localhost $i; done The script mostly returns the following message: Connection refused. However, there are several entries in the console display that look like this:
Connected to localhost
Connected to localhost
Which of the following actions should the technician perform NEXT?

Look for an unauthorized HTTP service on this server
Look for a virus infection on this server
Look for an unauthorized Telnet service on this server
Look for an unauthorized port scanning service on this server.

Answer(s): A

Explanation:

The script that the technician is running is trying to connect to every port on the localhost (the same machine) using telnet, a network protocol that allows remote access to a command-line interface. The script mostly fails because most ports are closed or not listening for connections. However, the script succeeds on ports 80 and 443, which are the default ports for HTTP and HTTPS protocols, respectively. These protocols are used for web services and web browsers. Therefore, the technician should look for an unauthorized HTTP service on this server, as it may indicate a security breach or a misconfiguration. Looking for a virus infection on this server is also possible, but not the most likely source of the issue. Looking for an unauthorized Telnet service on this server is not relevant, as the script is using telnet as a client, not a server. Looking for an unauthorized port scanning service on this server is not relevant, as the script is scanning ports on the localhost, not on other machines.

Reference:

https://phoenixnap.com/kb/telnet-windows https://www.techopedia.com/definition/23337/http-port-80 https://www.techopedia.com/definition/23336/https-port-443

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QUESTION: 165

Explanation:

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QUESTION: 166

Explanation:

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QUESTION: 167

Explanation:

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QUESTION: 168

Explanation:

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