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DNS DNS : Domain Name System Name & Addres Name Character string for human use e.g. www.naver.com Mnemonic Address : Where you are IP address (32 bit string) : used by a machine www.naver.com → 32-bit string으로 변환 How to map between IP addresses and name? Mapping a name to an address or an address to a name is called name-address resolution. DNS Name resolution Solution 1 : Static Mapping Hostnam..

Electronic Mail (SMTP, POP3, IMAP) Electronic Mail Three major components: user agents mail servers simple mail transfer protocol : SMTP User Agent "mail reader" - 메일을 보내고 읽을 때 사용된다. composing, editing, reading mail messages e.g., Outlook, elm, Netscape Messenger outgoing, incoming messages stored on server Electronic Mail : mail servers Mail servers mailbox contains incoming messages for user (..

Application layer ; Web and HTTP Web and HTTP web page consists of objects object can be HTML file, JPEG image, Java applet, audio file... web page consists of base HTML-file which includes several referenced objects Hypertext/hypermedia file which information is organized as a set of documents (objects) ; object들을 포함한 document Each object is addressed by a uniform resource locator (URL) HyperTe..

Application Layer : Principles of network applications Creating a network app Write programs that run on different end systems communication over a network e.g., Web : 웹 서버 소프트웨어와 브라우저 소프트웨어 사이의 소통 No software written for devices in network core Network core devices do not function at app layer, but instead function at the network layer and below This design allows for rapid app development Appl..