1 / 5

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.

jerrod
Télécharger la présentation

DNS, Web, TCP Sequence Numbers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related