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© 2007 Cisco Systems, Inc. All rights reserved. Cisco PublicITE PC v4.0Chapter 1 1
Application Layer Functionality and Protocols
Network Fundamentals – Chapter 3
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ITE PC v4.0Chapter 1 2© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Objectives Define the application layer as the source and
destination of data for communication across networks.
Explain the role of protocols in supporting communication between server and client processes.
Describe the features, operation, and use of well-known TCP/IP application layer services (HTTP, DNS, SMTP).
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ITE PC v4.0Chapter 1 3© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Applications – The Interface Between Human and Data Networks Explain that applications provide the means for generating and
receiving data that can be transported on the network
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ITE PC v4.0Chapter 1 4© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Applications – The Interface Between Human and Data Networks Explain the role of applications, services and protocols in
converting communication to data that can be transferred across the data network
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ITE PC v4.0Chapter 1 5© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Applications – The Interface Between Human and Data Networks Define the separate roles applications, services and protocols play
in transporting data through networks
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ITE PC v4.0Chapter 1 6© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Applications – The Interface Between Human and Data Networks Describe the role protocols play in networking and be able to
identify several message properties that can be defined by a protocol
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ITE PC v4.0Chapter 1 7© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
The Role of Protocols in Supporting Communication Describe the roles of client and server processes in data networks
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ITE PC v4.0Chapter 1 8© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
The Role of Protocols in Supporting Communication List common Application Layers services and protocols
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ITE PC v4.0Chapter 1 9© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
The Role of Protocols in Supporting Communication Compare and contrast client server networking with peer-to-peer
networking and peer-to-peer applications
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ITE PC v4.0Chapter 1 10© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Features, Operation, and Use of TCP/IP Application Layer Services Describe the features of the DNS protocol and how this protocol
supports DNS services
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ITE PC v4.0Chapter 1 11© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Features, Operation, and Use of TCP/IP Application Layer Services Describe the features of the HTTP protocol and how this protocol
supports the delivery of web pages to the client
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ITE PC v4.0Chapter 1 12© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Features, Operation, and Use of TCP/IP Application Layer Services Describe the features of the POP and SMTP protocols, and how
these protocols support e-mail services
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ITE PC v4.0Chapter 1 13© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Features, Operation, and Use of TCP/IP Application Layer Services Describe the features of the Telnet protocol and identify several of
its uses in examining and managing networks
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ITE PC v4.0Chapter 1 14© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Features, Operation, and Use of TCP/IP Application Layer Services Describe the features of the SMB protocol and the role it plays in
supporting file sharing in Microsoft-based networks
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ITE PC v4.0Chapter 1 15© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Features, Operation, and Use of TCP/IP Application Layer Services Describe the features of the Gnutella protocol and the role it plays
in supporting P2P services
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ITE PC v4.0Chapter 1 16© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Summary
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ITE PC v4.0Chapter 1 17© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public