Recursive name servers: Servers that perform full DNS resolution requests
Reverse lookup zone files: They let DNS resolvers ask for an IP, and get the FQDN associated with it returned
Reverse proxy: A service that might appear to be a single server to external clients, but actually represents many servers living behind it
Round robin: It is a concept that involves iterating over a list of items one by one in an orderly fashion
SRV record: A service record used to define the location of various specific services
Start of authority: A declaration of the zone and the name of the name server that is authoritative for it
Top Level Domain (TLD): The top level of the DNS or the last part of a domain name. For example, the “com” in www.weather.com
Time-To-Live field (TTL): An 8-bit field that indicates how many router hops a datagram can traverse before it's thrown away
Two-factor authentication:A technique where more than just a username and password are required to authenticate. Usually, a short-lived numerical token is generated by the user through a specialized piece of hardware or software
TXT record: It stands for text and was originally intended to be used only for associating some descriptive text with a domain name for human consumption
Types of DNS servers: There are five primary types of DNS servers; caching name servers, recursive name servers, root name servers, TLD name servers, and authoritative name servers
Virtual Private Network (VPN):A technology that allows for the extension of a private or local network, to a host that might not work on that same local network
Zone Files: Simple configuration files that declare all resource records for a particular zone
Terms and their definitions from previous modules
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ACK flag: One of the TCP control flags. ACK is short for acknowledge. A value of one in this field means that the acknowledgment number field should be examined
