DNS Records and Messages
DNS Records and Messages

The DNS servers that collectively implement the DNS distributed database store resource records (RRs), including RRs that provide hostname-to-IP address mappings. Each DNS reply message carries one or more resource records. In this and the following subsection, we

Tags resource records, dns servers, hostname, dns messages, mail server, nslookup program
Socket Programming with UDP
Socket Programming with UDP

We studied in the previous section that when two processes communicate over TCP, it is as if there were a pipe between the two processes. This pipe remains in place until one of the two processes closes it. When one of the processes wants to send some bytes to the other process,

Tags processes, hostname, tuple
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