One of my assistants tried to remote into a client's machine yesterday use the client's FQDN. He struck out. He then hopped into the DHCP console found her laptop's dynamic IP and used it successfully. When he later checked her A record in DNS, he found it to be incorrect.
He manually changed the A record in DNS and was then able to remote in using her FQDN as well.
1) Is the manual change in DNS dangerous? Isn't DHCP supposed to be doing that?
2) More importantly, the disparity between DHCP and DNS is a concern. Where should I start looking to find the cause for this?