1 / 11

DNS

DNS. Conceptos Básicos. DNS – Conceptos Básicos. Structure of Computer Names. mordred.cs.purdue.edu www.buknell.edu. To obtain a domain, an organization must register with the Internetn autority. A unique domain suffix is assigned to each organization. DNS – Conceptos Básicos.

josef
Télécharger la présentation

DNS

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 Conceptos Básicos

  2. DNS – Conceptos Básicos • Structure of Computer Names mordred.cs.purdue.edu www.buknell.edu To obtain a domain, an organization must register with the Internetn autority. A unique domain suffix is assigned to each organization.

  3. DNS – Conceptos Básicos • Geographic Structure Corporation For National Research Initiatives: cnri.reston.va.us Banco Nacional de Costa Rica: www.bncr.fi.cr

  4. DNS – Conceptos Básicos • Domain Names within Organization walnut.candy.foobar.com The number of segments in a domain corresponds to the naming hierarchy. There is no universal standard because each organization can choose how to structure names in its hierarchy. Futhermore, names within an organization do not need to follow a uniform pattern because individual groups within the organization can chosee a hierarchical structure that is appropriate for the group computer.foobar.com computer.location.foobar.com computer.division.location.foobar.com

  5. DNS – Conceptos Básicos • The DNS Client –Server Model Distribute Database • The DNS Server Hierarchy Authority, Hierarchy • Server Architectures Single Server, Update, Multiple Servers

  6. DNS – Conceptos Básicos • Locality Of Reference and Multiple Server The locality of reference principle: computer communication follows two distinct patters. Fist, a computer is more likely to communicate with computers that are physically nearly than with computers that are far away. Second, a computer is more likely to commmunicate with the same set of computers repeatedly. Pag 103, Cap 8, Comer

  7. DNS – Conceptos Básicos • Links Among Servers All domain name servers are linked together to form a unified system. Each server knows how to reach a root server and how to reach servers that are authorities for names further down the hierarchy

  8. DNS – Conceptos Básicos • Resolving a Name The translation of domain name into an equivalent IP address is called named resolution The resolver software in a host always request recursive resolution in which a name is resolved to an equivalent address. When it becomes a client of another server, a server can request iterative resolution to step trough yhe server hierarchy one level at a time

  9. DNS – Conceptos Básicos • Optimization of DNS Performance Replication: NS2.A NS1.A 1.A 2.A 3.A 1.A 2.A 3.A

  10. RED ? DNS – Conceptos Básicos • Optimization of DNS Performance DNS Caching is more important than replication because caching affects most of the system. Z B 1.C 1.Z Client C A 1.C 2.C

  11. DNS – Conceptos Básicos • Types of DNS Entries The domain name system stores a type with each entry. When resolver looks up name, the resolver must specify the type that is desired; a DNS server retuns only entries that match the specified

More Related