1. © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public 1 Version 4.1 The Internet and Its Uses Working at a Small-to-Medium Business or ISP – Chapter 1

2. 2 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Objectives  Describe how the Internet is evolving and the various ways that businesses are using the Internet.  Describe the importance of standards in the continuing growth of the Internet.  Describe the purpose of an ISP and the services that it offers.  Describe the hierarchical structure of the Internet and the purpose of the Point of Presence (POP) and the Internet Exchange Point (IXP).  Identify the types of devices used by the ISP to provide services and describe the importance of scalability in the ISP network.  Describe the various network support teams that work at an ISP and the roles and responsibilities of each one.

3. 3 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public What is the Internet?  A worldwide, publicly accessible network of networks.  Business uses of the Internet: –E-commerce –Communications –Collaboration and training

4. 4 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public What is the Internet?  A standard is a set of rules for how something must be done.  Internet standards are the product of a cycle of discussion, problem solving, and testing.

5. 5 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public What is the Internet?  An ISP is a company or organization through which a subscriber obtains Internet access.

6. 6 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Internet Service Providers  ISPs offer various connection options.

7. 7 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Internet Service Providers  High-bandwidth connection options for businesses: –T1 connections –T3 connections –Metro Ethernet

8. 8 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Internet Service Providers  Hierarchical structure of the Internet.

9. 9 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Internet Service Providers  Use network utilities to map the Internet. –Ping –Traceroute

10. 10 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public ISP Connectivity  Access Devices: DSLAM, CMTS, modems, wireless bridging equipment  Border Gateway Routers  Servers  Power conditioning equipment  High-capacity air conditioning

11. 11 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public ISP Connectivity  Scalability to allow for future growth.  Modular devices with expansion slots.

12. 12 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public ISP Connectivity  Roles and responsibilities within an ISP: –On-site Installation –Customer Service –Planning and Provisioning –NOC –Help Desk

13. 13 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public Summary  Businesses use the Internet for e-commerce, communications, collaboration, and training.  Internetworking standards ensure that all devices connecting to the Internet use the same set of rules.  All Internet connections are made through an Internet Service Provider (ISP).  Multiple ISPs join together at an Internet Exchange Point (IXP) to gain access to each other’s networks.  ISPs must provide a reliable and scalable network.  ISP organizations are composed of many teams offering a range of support services.

14. 14 © 2007 Cisco Systems, Inc. All rights reserved.Cisco Public