Computer Networks - lecture2Application Layer and DNS

Computer networks lecture2application layer and dns

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Unformatted text preview: Domain Name System (DNS) DNS Server Service Overview of Domain Name System What Is a Domain Namespace? Standards for DNS Naming Overview of Domain Name System Domain Name System (DNS) is a hierarchical, distributed database that contains mappings of DNS domain names to various types of data, such as IP addresses DNS is the foundation of the Internet naming scheme and the foundation of an organization’s naming scheme DNS supports accessing resources by using alphanumeric names InterNIC is responsible for delegating administrative responsibility for portions of the domain namespace and for registering domain names DNS was designed to solve issues that arose when there was an increase in the: Number of hosts on the Internet Traffic generated by the update process Size of the Hosts file What Is a Domain Namespace? Root Domain Top-Level Domain net org Company1 Second-Level Domain Subdomains com west FQDN: server1.sales.south.company1.com south sales east Host: server1 Standards for DNS Naming The following characters are valid for DNS names: A-Z a-z 0-9 Hyphen (-) The underscore (_) is a reserved character What Are the Components of a DNS Solution? Resource Record R...
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This note was uploaded on 10/15/2011 for the course COMPUTER E EC-321 taught by Professor Liaqatali during the Spring '11 term at College of E&ME, NUST.

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