The server administrator needs to adhere to the Service Level Agreement (SLA) when responding to tickets within a certain amount of time. An SLA is a contract between a service provider and a customer that defines the quality, availability, and responsibilities of the service. An SLA may specify the response time for tickets, as well as other metrics such as uptime, performance, security, and backup frequency.Reference: https://www.
ibm.com/cloud/learn/service-level-agreements

A differential backup is a type of backup that copies all the files that have changed since the last full backup.
A differential backup requires more storage space than an incremental backup, which only copies the files that have changed since the last backup of any type, but it also requires less time to restore in case of data loss. By combining a full, weekly backup with daily differential backups, the administrator can ensure that only two backup sets are needed to restore a full backup as quickly as possible. Verified References: [Incremental vs Differential Backup]

The administrator should use the command chmod 754 /home/Ann to resolve the issue without granting unnecessary permissions. The chmod command is used to change the permissions of files and directories on a Linux server. The permissions are represented by three numbers, each ranging from 0 to 7, that correspond to the read , write (w), and execute (x) permissions for the owner, group, and others respectively. The numbers are calculated by adding up the values of each permission: r = 4, w = 2, x = 1. For example, 7 means rwx (4 +
2 + 1), 6 means rw- (4 + 2), 5 means r-x (4 + 1), etc. In this case, Ann's home directory has the permissions dr-xr-xr-, which means that only the owner (d) can read and execute (x) the directory, and the group and others can only read and execute (x) but not write (w) to it. This prevents Ann from saving files to her home directory. To fix this issue, the administrator should grant write permission to the owner by using chmod 754 /home/Ann, which means that the owner can read , write (w), and execute (x) the directory, the group can read and execute (x) but not write (w) to it, and others can only read but not write (w) or execute (x) it. This way, Ann can save files to her home directory without giving unnecessary permissions to others.
Reference:
https://linuxize.com/post/what-does-chmod-777-mean/

The server administrator should use cable management to prevent network connectivity loss when pulling a server from the rack during maintenance. Cable management is a practice of organizing and securing the cables that connect various devices and components in a system. Cable management can help improve airflow, reduce clutter, prevent tangling, and avoid accidental disconnection or damage of cables. Cable management can be done using various tools and techniques, such as cable ties, cable trays, cable labels, cable organizers, or cable ducts.

A CMOS battery failure can cause the server to lose its BIOS settings, including the date and time, which can affect the server's functionality and connectivity. The servers have NTP (Network Time Protocol) configured to synchronize their clocks with a reliable time source, which can prevent time drift and ensure consistent timestamps. If one server has a wrong date and time, it can cause conflicts and errors with the other servers that have NTP configured.
References:
* CompTIA Server+ Certification Exam Objectives1, page 9
* Signs or symptoms of a CMOS battery failure2
* NTP: Network Time Protocol