The correct answers are B. 2.4GHz penetrates solid objects more effectively. 5GHz provides faster data connections and E. 2.4GHz has a higher coverage area. 5GHz has higher bandwidth. The 2.4GHz frequency has a lower data rate compared to 5GHz, but it can penetrate solid objects more effectively and has a higher coverage area. The 5GHz frequency, on the other hand, provides faster data connections and has higher bandwidth, but it has fewer channels and lower transmit power.

CMOS is for date and time and should not stop a host from booting. If working on a host with ECC memory you would test the ram in a different slot or a different Stick all together. If that did not work, I would swap in the other CPU to check if that is the issue. The ECC part isn't important other than thats what I'm used to working on at AWS and that is the only way you would be able to swap the CPUs easily.

Domain Name System (DNS) is an Internet service that translates domain names (e.g., its.umich.edu) into IP addresses. Dynamic Host Configuration Protocol (DHCP) is a protocol for automatically assigning IP addresses and other configurations to devices when they connect to a network.

Web cameras can input to one software at a time. Closing other video software is the first step in troubleshooting the issue as it doesn't require customer or on-site support. After restarting the computer and adjusting the drivers, it would be time to ask the customer to reseat the webcam or replace the device.