CompTIA Network+

Answer: D - A DNS TTL value of 36000 means 10 hours, hence the user’s request would need to reach xyz. com’s name server for DNS resolution by 9:00 p.m.

Key Takeaway: TTL is an acronym for Time to Live and refers to the capability of the DNS servers to cache DNS records. It represents the amount of time that a DNS record for a certain host remains in the cache memory of a DNS server after the latter has located the host's matching IP address. By specifying TTL settings for a particular domain's DNS records, webmasters define the frequency of website content updates. The longer the TTL value is, the faster the domain resolution time period will be. The TTL value can be set from one second to approximately 68 years. If you need to make changes to your DNS records, you will have to decrease the TTL value entry to several minutes to avoid any outdated data on your website.