MMT1-Lec10 - Computer Networks 1 (Mng My Tnh 1) Lectured...

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1 Computer Networks 1 (Mạng Máy Tính 1) Lectured by: Nguyễn Đức Thái
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2 Lecture 10: Application Layer
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3 Application Layer Where our applications are running Using services provided by layers below We will look at: Domain Name System Email File Transfer Protocol World Wide Web
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4 Domain Name System - DNS IP addresses can be used to identify a host machine on the Internet As people moves around, the addresses need to be changed accordingly as well ASCII names have been invented to decouple host names and their IPs to provide more flexibility The DNS was invented to manage and resolve host names into IP addresses
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5 The DNS Name Space A portion of the Internet domain name space.
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6 Resource Records Every domain has a set of records associated with The principal DNS resource records types.
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7 Resource Records (2) A portion of a possible DNS database for cs.vu.nl.
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8 Resource Records (3) hcmut.edu.vn. IN SOA hcmut-server.hcmut.edu.vn. webmaster.hcmut.edu.vn. ( 2004110800; serial 7200; refresh 3600; retry 604800; expire 86400 ); minimum hcmut.edu.vn. 86400 IN NS vnuserv.vnuhcm.edu.vn. hcmut.edu.vn. 86400 IN NS server.vnuhcm.edu.vn. hcmut.edu.vn. 86400 IN MX 0 webmailserv.hcmut.edu.vn. hcmut.edu.vn. 86400 IN MX 5 vnuserv.vnuhcm.edu.vn. hcmut-server.hcmut.edu.vn. 86400 IN A 172.28.2.2 stu-mailserv.hcmut.edu.vn. 86400 IN A 172.28.2.3 webmailserv.hcmut.edu.vn. 86400 IN A 172.28.2.4 pop3.student.hcmut.edu.vn. 86400 IN CNAME stu-mailserv.hcmut.edu.vn. www.student.hcmut.edu.vn 86400 IN CNAME stu-mailserv.hcmut.edu.vn .
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9 Name Servers DNS Name Space is organised into nop-overlapping zones Each zone has Name Servers holding information about it
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10 DNS - Query recursive query puts burden of name resolution on contacted name server. heavy load ? iterated query contacted server replies with name of server to contact. “I don’t know this name, but ask this server” requesting host surf.eurecom.fr gaia.cs.umass.edu root name server local name server dns.eurecom.fr 1 2 3 4 5 6 authoritative name server dns.cs.umass.edu intermediate name server dns.umass.edu 7 8 iterated query
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11 Electronic Mail – Email (or E-mail) Has been around since the early days of Internet Is widely used today Informal form of communication Simple and easy to use
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12 Electronic Mail (2) Some smileys :-).
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This note was uploaded on 11/25/2010 for the course INFORMATIO 506002 taught by Professor Nguyenducthai during the Winter '10 term at RMIT Vietnam.

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MMT1-Lec10 - Computer Networks 1 (Mng My Tnh 1) Lectured...

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