A redundant power supply is a type of power supply that consists of two or more independent units that can provide power to the same device or system. A redundant power supply can increase the reliability and availability of the device or system, because if one unit fails, the other unit can take over and continue to provide power without interruption. A redundant power supply is often used in servers that require continuous availability, such as web servers, database servers, or file servers.

The CMOS (complementary metal-oxide-semiconductor) is a small chip on the motherboard that stores the BIOS settings, including the date and time. The CMOS battery is a coin cell battery that provides power to the CMOS chip when the computer is turned off, so that the BIOS settings are not lost. If the CMOS battery is discharged, the CMOS chip will lose its data, and the date and time will be reset to the default values. This will cause a message to display indicating that the date and time are incorrect when the computer is turned on.
The other computers on the network do not display this message because they have functional CMOS batteries. The most likely cause of this issue is the CMOS battery is discharged, and it needs to be replaced with a new one12.

The technician failed to properly diagnose the issue by not establishing a theory of probable cause. Instead of investigating why the network drives were accessible wirelessly but not when docked, the technician assumed a faulty network card and ordered a new laptop. Proper troubleshooting involves developing a theory of what might be causing the problem, based on the symptoms and available information, and then testing that theory.
In this case, the issue could have been related to docking station settings, network configurations, or hardware issues specific to the docking connection.
References: This answer is grounded in standard troubleshooting methodologies, which emphasize the importance of logically deducing the most likely cause of a problem before proceeding with more drastic measures such as replacing hardware.

DNS stands for Domain Name System, and it is a network service that translates human-readable names (such as www.google.com) into numerical IP addresses (such as 172.217.14.206) that identify the location of the web servers on the internet. DNS also allows reverse lookup, which means finding the domain name associated with a given IP address. DNS servers are responsible for maintaining a database of domain names and their corresponding IP addresses, and responding to queries from clients who want to resolve a name to an address or vice versa12.
DHCP stands for Dynamic Host Configuration Protocol, and it is a network service that automatically assigns IP addresses and other network configuration parameters (such as subnet mask, default gateway, DNS server, etc.) to devices that join a network. DHCP servers are responsible for managing a pool of IP addresses and leasing them to clients for a specified duration. DHCP servers also renew or release the IP addresses when the lease expires or the client disconnects from the network34.
The difference between DNS and DHCP is that DNS is used for address translation, which means converting domain names to IP addresses and vice versa, while DHCP is used for IP address assignment, which means providing IP addresses and other network settings to devices that need to communicate on a network.
References:
* DNS Configuration - CompTIA A+ 220-1101 - 2.6
* DHCP Configuration - CompTIA A+ 220-1101 - 2.6 - Professor Messer IT Certification Training Courses
* CompTIA A+ 220-1101 - 2.6 - Professor Messer IT Certification ...
* Courses for CompTIA A+: 220-1101: CompTIA A+ (Core 1) - Skillsoft