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Unformatted text preview: P to request web page from x.com’s website server.
7. x.com’s website server sends web page to browser.
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recursive and non-recursive lookups
› recursive: server fully answers query
› non-recursive: sends back name of next server
› query returns name of server, so need to resolve that
› what if server is in domain being queried?
› glue record: provides IP address is this case
about 40 record types
› A: most common; returns IP for domain name
› CNAME: alias to another domain name
9 things to know about
› name server holds records it heard about from others
› no explicit invalidation; records expire
› so causes delay when name changes
› 80 replicas of root name server (2008)
› decentralized since 1999 › registrar causes delay too where can I learn more?
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This document was uploaded on 03/18/2014 for the course EECS 6.170 at MIT.
- Spring '13