Cisco Internetwork Troubleshooting © 2005 Cisco Systems, Inc. All rights reserved. Applying a Layered Model to a Network CIT v5.22-1. - презентация

1 Cisco Internetwork Troubleshooting © 2005 Cisco Systems, Inc. All rights reserved. Applying a Layered Model to a Network CIT v5.22-1

2 © 2005 Cisco Systems, Inc. All rights reserved. CIT v Outline What are the Differences Between the Layered Networking Models? Identifying the Encapsulated Data Flow Process Where Do Network Devices Map in a Logical Model?

3 © 2005 Cisco Systems, Inc. All rights reserved. CIT v Comparing the OSI Model with the TCP/IP Model

4 © 2005 Cisco Systems, Inc. All rights reserved. CIT v Comparing the OSI Model with the TCP/IP Model

5 © 2005 Cisco Systems, Inc. All rights reserved. CIT v Comparing the OSI Model with the TCP/IP Model

6 © 2005 Cisco Systems, Inc. All rights reserved. CIT v Comparing the OSI Model with the TCP/IP Model

7 © 2005 Cisco Systems, Inc. All rights reserved. CIT v The Process of Encapsulated Data Flow on a Simple Connection Sending data from an application in End System A to an application in End System B

8 © 2005 Cisco Systems, Inc. All rights reserved. CIT v The Process of Encapsulated Data Flow on a Simple Connection Sending data from an application in End System A to an application in End System B

9 © 2005 Cisco Systems, Inc. All rights reserved. CIT v The Process of Encapsulated Data Flow on a Simple Connection Sending data from an application in End System A to an application in End System B

10 © 2005 Cisco Systems, Inc. All rights reserved. CIT v The Process of Encapsulated Data Flow on a Simple Connection Sending data from an application in End System A to an application in End System B

11 © 2005 Cisco Systems, Inc. All rights reserved. CIT v The Process of Encapsulated Data Flow on a Simple Connection Sending data from an application in End System A to an application in End System B

12 © 2005 Cisco Systems, Inc. All rights reserved. CIT v PhysicalData LinkNetworkTransportApplication Network Devices Mapped to a Logical Layered Model Firewall X Standard Switch XX Multilayer Switch X X Hub End System XXX Router XXX X X * * *X X XX

13 © 2005 Cisco Systems, Inc. All rights reserved. CIT v Summary The TCP/IP networking model maps closely to the layers of the OSI networking model. The ability to identify the stages of the encapsulated data flow process enhances the ability of a troubleshooter to diagnose problems as data moves between points within an end-to-end network. The ability to identify which logical layers a device uses gives a troubleshooter the ability to minimize the complexity of a problem by dividing the problem into manageable parts.

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