D
- datagram
- According to the IETF RFC 1594, a datagram is "a self-contained, independent entity of data carrying sufficient information to be routed from the source to the destination computer without reliance on earlier exchanges between this source and destination computer and the transporting network." That definition is applicable to the data transported by UDP and not TCP.
- decimal mask
- A decimal mask is used to hide a raw 32-bit binary IP address behind something a bit more user-friendly. That mask takes the form of a dotted decimal number with four parts. For example, 10.1.2.128 is a decimal mask for 00001010.00000001.00000010.10000000.
- destination machine
- The networked device that receives a communications session.
- Domain Name System
- A Domain Name System, or DNS, is a database that tracks and correlates the user-friendly domain and host names used in the Internet with IP addresses. This mechanism allows you to initiate a communications session using a user-friendly name, even though an IP network uses only IP addresses.
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