CompTIA SK0-005 Practice Test - Questions Answers, Page 11

The live failover testing method is the most likely one that the server administrator is performing when creating a downtime scenario and taking the necessary steps. A live failover test involves switching from the primary system to the secondary system (or backup site) in a real environment, without any simulation or preparation. A live failover test can evaluate the effectiveness and readiness of the disaster recovery plan, but it also carries a high risk of data loss, corruption, or disruption. Reference: https://www.ibm.com/cloud/learn/disaster-recovery-testing

Reference: https://www.digitalcitizen.life/simple-questions-what-are-disk-quotas-how-set-themwindows/ Disk quotas are a way to limit disk usage on a server by setting a maximum amount of space that each user or group can use. Disk quotas can help manage disk space allocation, prevent disk space exhaustion, and enforce fair usage policies. Disk quotas can be set at the volume level or at the folder level, depending on the file system and operating system used. Reference:

https://docs.microsoft.com/en-us/windows-server/storage/ntfs/ntfs-disk-quotas-overview

The next action that the administrator should take once the rebuild is finished is to swap the drive and initialize the disk. This is to replace the faulty disk that has a solid amber light, which indicates a predictive failure or a SMART error. Initializing the disk will prepare it for use by the RAID controller and add it to the array. The administrator should also monitor the array status and performance after swapping the drive. Reference: https://www.salvagedata.com/how-to-rebuild-a-failed-raid/

The most efficient subnet address for a network that will have no more than 30 available IP addresses is 255.255.255.224. This subnet mask corresponds to a /27 prefix length, which means that 27 bits are used for the network portion and 5 bits are used for the host portion of an IP address. With 5 bits for hosts, there are 2^5 - 2 = 30 possible host addresses per subnet, which meets the requirement. The other options are either too large or too small for the network size. Reference:

https://www.ibm.com/cloud/learn/subnet-mask

The connection type that the server administrator is using to access the server remotely is out-ofband management. Out-of-band management is a method of accessing and controlling a server through a dedicated network interface or port that is separate from the regular data network. Outof- band management allows administrators to perform tasks such as rebooting, configuring, troubleshooting, or updating a server even if the server is offline or unresponsive through the regular network. Out-of-band management can use protocols such as IPMI, iLO, DRAC, or BMC.

Reference: https://www.ibm.com/cloud/learn/out-of-band-management

The best way to limit an attacker from exploiting a zero-day vulnerability that is impacting a service enabled on a server OS is to install the latest patches. Patches are updates that fix bugs, improve security, or add features to software. Installing patches can help prevent attackers from exploiting known vulnerabilities that have been fixed by the software vendor. A zero-day vulnerability is a vulnerability that is unknown to the vendor or the public until it is exploited by an attacker. Therefore, installing patches as soon as they are available can reduce the window of opportunity for attackers to exploit zero-day vulnerabilities. Reference: https://www.ibm.com/cloud/learn/patchmanagement

If the server is not reachable by name but can be accessed by IP address, it means that there is a problem with name resolution. The hosts file and the DNS server are both responsible for mapping hostnames to IP addresses. Therefore, the server administrator should check these two files for any errors or inconsistencies that might prevent the server from being resolved by name. Reference:

https://www.howtogeek.com/662249/how-to-edit-the-hosts-file-on-linux/ https://www.howtogeek.com/164981/how-to-use-nslookup-to-check-domain-name-information-inmicrosoft- windows/

To disable root login over SSH, the server administrator needs to edit the SSH configuration file located at /etc/ssh/sshd_config. This file contains various settings for the SSH daemon that runs on the server and accepts incoming SSH connections. The administrator needs to find the line that says PermitRootLogin and change it to no or comment it out with a # symbol. Then, the administrator needs to restart the SSH service for the changes to take effect. Reference:

https://www.howtogeek.com/828538/how-and-why-to-disable-root-login-over-ssh-on-linux/

The write cache is a feature of some RAID controllers that allows them to temporarily store data in a fast memory buffer before writing it to the disk drives. This improves the performance and efficiency of write operations, especially for random and small writes. However, if the battery on the controller goes bad, the controller may disable the write cache to prevent data loss in case of a power failure. This can degrade the disk drive performance significantly, as every write operation will have to wait for the disk drives to complete. Reference: https://www.dell.com/support/kbdoc/enus/ 000131486/understanding-raid-controller-battery-learn-cycle

https://www.techrepublic.com/article/understanding-raid-controller-write-cache/