7 Application Layer.pptx

8/13/2019 7 Application Layer.pptx

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Application Layer

Computer Networks

Tutun JuhanaTelecommunication EngineeringSchool of Electrical Engineering & Informatics

Institut Teknologi Bandung

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HOST CONFIGURATION: DHCP

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DHCP Operation

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DOMAIN NAME SYSTEM (DNS)

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Name Space

Flat Name Space In a flat name space, a name is assigned to an

address

A name in this space is a sequence of characters

without structure. The main disadvantage : it cannot be used in a large

system because it must be centrally controlled to

avoid ambiguity and duplication

Hierarchical Name Space Each name is made of several parts

A central authority can assign the part of the name

that defines the nature of the organization and the

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Domain Name Space

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Domain

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Distribution of Name Space

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DNS in the Internet

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Resolver

DNS is designed as a client-server application A host that needs to map an address to a name or a

name to an address calls a DNS client called a resolver

The resolver accesses the closest DNS server with a

mapping request If the server has the information, it satisfies the resolver;

otherwise, it either refers the resolver to other servers or

asks other servers to provide the information

After the resolver receives the mapping, it interprets theresponse to see if it is a real resolution or an error, and

finally delivers the result to the process that requested it

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Caching

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TELNET AND SSH

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Telnet

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SSH

Secure Shell

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FTP

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W b S


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Web Server

Uniform Resource Locator (URL)

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W b D t


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Web Document

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HTTP


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HTTP

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Cookies


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Cookies

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The World Wide Web was originallydesigned as a stateless entity


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ELECTRONIC MAIL:SMTP, POP, IMAP, AND MIME

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Architecture


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Architecture

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User Agent (UA)


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User Agent (UA)

It provides service to the user to make theprocess of sending and receiving a

message easier.

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Mail Transfer Phases


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Mail Transfer Phases

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Message Access Agent: POP AND IMAP


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Message Access Agent: POP AND IMAP

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POP3Post Office Protocol version 3


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Post Office Protocol, version 3

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IMAP4Internet Mail Access Protocol version 4


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Internet Mail Access Protocol, version 4

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MIME


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MIME

Multipurpose Internet Mail Extensions(MIME) is a supplementary protocol that

allows non-ASCII data to be sent through

e-mail

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Web-based mail


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Web based mail

Date post:	04-Jun-2018
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7 Application Layer.pptx

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