Lecture13 - COP 4600 Operating Systems Fall 2010 Click to...

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Click to edit Master subtitle style 8/1/11 Lecture 13 COP 4600 Operating Systems Fall 2010 Dan C. Marinescu Office: HEC 439 B Office hours: Tu-Th 3:30-4:30 PM
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Lecture 13 8/1/11 n Last time: ¨ Heterogeneity; little-endian and big-endian representation ¨ Timing, response time. ¨ Trusted intermediaries ¨ Case study the X11 system. n Peer-to-peer systems n Remote Procedure Calls n Today: n Presentation of the RPC paper by Birell. n Domain Name Service (DNS) n NFS (Network File System) n Virtualization: Threads, Virtual memory, Bounded buffers.Virtual Links ¨ Next time ¨ Thread coordination with a bounded buffer ¨ Race conditions Lecture 13 – Tuesday October 5, 2010 22
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Lecture 13 8/1/11 33 DNS Dictionary n Domain name & an identification label that defines a realm of administrative autonomy, authority, or control in the Internet, based on the Domain Name System. The top-level domains (TLDs) are the highest level of domain names of the Internet; they form the DNS root zone. There are 20 generic top-level domains and 248 country code top-level domains n Authoritative name server gives original, first-hand , definitive answers; holds either the name record or a referral record for the name n Authoritative record n Naming authority y an Internet administrative authority allowed to add authoritative records to a name server n Referral record k binds a hierarchical region of the DNS name space to another server that could help resolve the name n Recursive name service x a DNS server takes upon itself to resolve a name rather than provide a referral record. n Idempotent action & action that can be interrupted and restarted from the beginning any number of times and still produce the same result as if the action had run to completion without interruption
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Lecture 13 8/1/11 44 How DNS works n A client sends a request to resolve a name to a Domain Name server n The server examines the collection of the domains it is responsible for
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Lecture13 - COP 4600 Operating Systems Fall 2010 Click to...

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