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DNS, Web, TCP Sequence Numbers

DNS, Web, TCP Sequence Numbers. EE122 Discussion 10/19/2011. DNS. Mapping between names (e.g., www.cnn.com) and addresses (e.g., 157.166.255.18) Hierarchy of DNS servers Root servers Top-level domain (TLD) servers Authoritative DNS servers Default Name Server. HTTP.

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DNS, Web, TCP Sequence Numbers

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  1. DNS, Web, TCP Sequence Numbers EE122 Discussion 10/19/2011

  2. DNS • Mapping between names (e.g., www.cnn.com) and addresses (e.g., 157.166.255.18) • Hierarchy of DNS servers • Root servers • Top-level domain (TLD) servers • Authoritative DNS servers • Default Name Server

  3. HTTP • Request-response protocol • Based on a global naming system • …which uses the DNS for resolution • HTTP runs on top of TCP

  4. TCP Sequence Numbers • Initial sequence number for the connection is not zero • Sequence number refers to the first byte in the TCP packet payload

  5. Example (from class) • Packet arrives: • Seq: 2323 • Ack: 4001 • W=3000 • [no payload] • Appropriate response? Seq: 4001, payload: 4001-8000 Seq: 2001, payload: 2001-5000 Seq: 4001, payload: 4001-5000 Seq: 5001, payload: 5001-6001 Seq: 8001, payload: 8001-9000

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