lec-10 - What's next. Domain Name System (DNS) 26 Aug 2008...

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26 Aug 2008  BITS C481 (Computer Networks) 1 What’s next… Domain Name System (DNS)
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26 Aug 2008  BITS C481 (Computer Networks) 2 DNS: Domain Name System People: many identifiers: SSN, name, passport # Internet hosts, routers: IP address (32 bit) - used for addressing datagrams “name”, e.g., www.yahoo.com - used by humans Q: Map between IP addresses and name? Domain Name System: Distributed database implemented in hierarchy of many name servers Application-layer protocol allows hosts to query the distributed database.
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26 Aug 2008  BITS C481 (Computer Networks) 3 DNS  DNS services Hostname to IP address translation Host aliasing Canonical and alias names Mail server aliasing Load distribution Replicated Web servers: set of IP addresses for one canonical name Why not centralize DNS? Single point of failure Traffic volume Distant centralized database Maintenance
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26 Aug 2008  BITS C481 (Computer Networks) 4 Root DNS Servers com DNS servers org DNS servers edu DNS servers poly.edu DNS servers umass.edu DNS servers yahoo.com DNS servers amazon.com DNS servers pbs.org DNS servers Distributed, Hierarchical Database Client wants IP for www.amazon.com; 1 st approx: Client queries a root server to find com DNS server Client queries com DNS server to get amazon.com DNS server Client queries amazon.com DNS server to get IP address for www.amazon.com
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This note was uploaded on 07/20/2009 for the course INFORMATIO BITS C481 taught by Professor Prof.virendrasinghshekhawat during the Fall '08 term at Birla Institute of Technology & Science, Pilani - Hyderabad.

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lec-10 - What's next. Domain Name System (DNS) 26 Aug 2008...

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