Benefits of Using Domain Name System (DNS) - PowerPoint PPT Presentation

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Benefits of Using Domain Name System (DNS)

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DNS names are more consistent than IP addresses. ... hyphen (-) Supports Unicode character set. 7. Zones. 8. Name Servers. Store the zone database file ... – PowerPoint PPT presentation

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Title: Benefits of Using Domain Name System (DNS)


1
Benefits of Using Domain Name System (DNS)
  • DNS names are user friendly.
  • DNS names are more consistent than IP addresses.
  • DNS allows the same naming convention as the
    Internet.

2
Domain Name Space
3
Examples of Second-Level Domains
  • Ed.gov
  • Microsoft.com
  • Stanford.edu
  • W3.org

4
Host Names
  • Refer to specific computers on the Internet or an
    intranet
  • The leftmost portion of a fully qualified domain
    name (FQDN), such as Computer1.sales.microsoft.com
  • Does not have to match the computer name

5
Domain Naming Guidelines
  • Limit the number of domain levels.
  • Use unique names.
  • Use simple names.
  • Avoid lengthy domain names.

6
Domain Naming Guidelines (continued)
  • Use standard DNS characters and Unicode
    characters
  • Microsoft Windows 2000 supports AZ, az, 09,
    hyphen (-)
  • Supports Unicode character set

7
Zones
8
Name Servers
  • Store the zone database file
  • Store the database file(s) for one or multiple
    zones
  • Have authority for the domain name space that the
    zone encompasses
  • Are required in every zone

9
Primary Zone Database File
  • A name server in each domain contains the master
    database file.
  • Changes to a zone are performed on it.
  • Multiple name servers act as a backup.

10
Benefits of Multiple Name Servers
  • Provide zone transfers
  • Provide redundancy
  • Improve access speed
  • Reduce the load

11
Name Resolution
  • Resolving names to IP addresses
  • DNS resolves www.microsoft.com to an IP address

12
Forward Lookup Query
13
Name Server Caching
14
Reverse Lookup Query
  • Maps an IP address to a name.
  • Used by troubleshooting tools such as the
    nslookup utility.
  • Some applications implement security based on the
    ability to connect to names.

15
The in-addr.arpa Domain
16
Introduction to DNS Clients
  • DNS is a distributed database used in TCP/IP
    networks.
  • TCP/IP must be installed to use DNS.

17
Internet Protocol (TCP/IP) Properties Dialog Box
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