August 2003
Intermediate to advanced
320 pages
10h 14m
English
Content preview from Practical TCP/IP and Ethernet Networking for Industry
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148 Practical TCP/IP and Ethernet Networking
• RCODE, the last field in the first long-word is used for response codes with
the following meanings:
• 0 = No error
• 1 = Format error
• 2 = Server error
• 3 = Name error
• 4 = Not used
• 5 = Refused
• Four COUNT fields indicate the length of the fields to follow:
• QDCOUNT gives the number of question entries
• ANCOUNT gives the number of resource records in the answer
section
• NSCOUNT refers to the number of name server resource records in
the Authority section
• ARCOUNT refers to the number of resource records in the additional
records section
• Question section
Contains queries in the format shown below. A query consists of a query
domain name field containing ...