dns.04f.ppt - CISC 856 TCP/IP and Upper Layer Protocols RFC...

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Presented by Neeta Jain CISC 856 TCP/IP and Upper Layer Protocols RFC 1034 & RFC 1035
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2 1. What is the IP address of udel.edu ? Introduction 1. What is the host name of 128.175.13.74 It is 128.175.13.92 It is strauss.udel.edu
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3 Real Life Analogy: Telephone Example Source: Child Newark, DE Destination: Dad Udel-Newark, DE Telephone connection Information Child Needs: Dad’s Phone #
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4 Dials 302-731-1212: (What is University # ?) operator 2 Dials 0: (what is Newark’s area code?) 3 (Newark’s area code is 302) Directory assist 4 5 (University number: 302-831- 4567) University operator 6 Dials 302-831-4567: (what is Dad phone #?) 7 Dad’s phone is 302-831-1949 Calls dad (What is Dad’s Phone#?) 1 Older sister Child Dad’s phone is 302-831-1949 8
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5 DNS Components There are 3 components: Name Space: Specifications for a structured name space and data associated with the names Resolvers: Client programs that extract information from Name Servers. Name Servers: Server programs which hold information about the structure and the names.
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6 Name Space
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7 Resolve rs A Resolver maps a name to an address and vice versa. Query Response Resolver Name Server
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8 iterative response (referral) “I don't know. Try a3.nstld.com.” 2 a3.nstl d.com 3 Iterative Resolution client iterative request “What is the IP address of ; udel server 1 iterative response (referral) “I don't know. Try a.root-servers.net.” 4 a.root server 5 iterative response (referral) “I don't know. Try a.gtld-servers.net.” 6 a.gtld- server 7 iterative response (referral) “I don't know. Try ns1.google.com.” 8 ns1.goo gle.com 9 iterative response “The IP address of is 216.239.37.99.” 10
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9 Recursive Resolution client recursive request “What is the IP address of ; udel serve r 1 edu server 2 root server 3 com server 4 google server 5 recursive response “The IP address of is 216.239.37.99.” 6 10 7 8 9
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10 Master server
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