1. © 2008 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 1 Chapter 1: Exploring the Network Introduction to Networks

2. Presentation_ID 2 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential CISCO CCNA 200-120  CCNA I-Introductiong to Networking  CCNA II-Routing and Switching Essentials  CCNA III-Scaling Networks  CCNA IV-Connecting Networks

3. Presentation_ID 3 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential CCNA I Chapters  Exploring the Network  Configuring a Network Operating System  Network Protocols and Communication  Network Access  Ethernet  Network Layer  Transport Layer  IP Addressing  Subnetting IP Networks  Application Layer  It’s a Network

4. Presentation_ID 4 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Chapter 1 1.1 Globally Connected 1.2 LANs, WANs, and the Internet 1.3 The Network as a Platform 1.4 The Changing Network Environment 1.5 Summary

5. Presentation_ID 5 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Networking Today Networks in Our Past and Daily Lives

6. Presentation_ID 6 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Providing Resources in a Network Networks of Many Sizes

7. Presentation_ID 7 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Providing Resources in a Network Clients and Servers

8. Presentation_ID 8 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Providing Resources in a Network Peer-to-Peer

9. Presentation_ID 9 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential LANs, WANs, and Internets Components of a Network There are three categories of network components:  Devices  Media  Services

10. Presentation_ID 10 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Components of a Network End Devices Some examples of end devices are:  Computers (work stations, laptops, file servers, web servers)  Network printers  VoIP phones  TelePresence endpoint  Security cameras  Mobile handheld devices (such as smartphones, tablets, PDAs, and wireless debit / credit card readers and barcode scanners)

11. Presentation_ID 11 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Components of a Network Network Infrastructure Devices Examples of intermediary network devices are:  Network Access Devices (switches, and wireless access points)  Internetworking Devices (routers)  Security Devices (firewalls)

12. Presentation_ID 12 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Components of a Network Network Media

13. Presentation_ID 13 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Components of a Network Network Representations

14. Presentation_ID 14 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Components of a Network Topology Diagrams

15. Presentation_ID 15 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential LANs and WANs Types of Networks The two most common types of network infrastructures are:  Local Area Network (LAN)  Wide Area Network (WAN). Other types of networks include:  Metropolitan Area Network (MAN)  Wireless LAN (WLAN)  Storage Area Network (SAN)

16. Presentation_ID 16 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential LANs and WANs Local Area Networks (LAN)

17. Presentation_ID 17 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential LANs and WANs Wide Area Networks (WAN)

18. Presentation_ID 18 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential LANs, WANs, and Internets The Internet

19. Presentation_ID 19 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential The Internet Intranet and Extranet

20. Presentation_ID 20 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential LANs, WANs, and Internets Internet Access Technologies

21. Presentation_ID 21 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Connecting to the Internet Connecting Remote Users to the Internet

22. Presentation_ID 22 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Connecting to the Internet Connecting Businesses to the Internet

23. Presentation_ID 23 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Converged Networks The Converging Network

24. Presentation_ID 24 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Converged Networks Planning for the Future

25. Presentation_ID 25 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Reliable Network Supporting Network Architecture As networks evolve, we are discovering that there are four basic characteristics that the underlying architectures need to address in order to meet user expectations:  Fault Tolerance  Scalability  Quality of Service (QoS)  Security

26. Presentation_ID 26 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Reliable Network Fault Tolerance in Circuit Switched Network

27. Presentation_ID 27 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Reliable Network Packet-Switched Networks

28. Presentation_ID 28 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Reliable Network Scalable Networks

29. Presentation_ID 29 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Reliable Network Providing (QoS) Examples of priority decisions for an organization might include:  Time-sensitive communication - increase priority for services like telephony or video distribution.  Non time-sensitive communication - decrease priority for web page retrieval or email.  High importance to organization - increase priority for production control or business transaction data.  Undesirable communication - decrease priority or block unwanted activity, like peer-to-peer file sharing or live entertainment

30. Presentation_ID 30 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Reliable Network Providing Network Security

31. Presentation_ID 31 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Network Trends New trends Some of the top trends include:  Bring Your Own Device (BYOD)  Online collaboration  Video  Cloud computing

32. Presentation_ID 32 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Network Trends Bring Your Own Device (BYOD)

33. Presentation_ID 33 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Network Trends Online Collaboration

34. Presentation_ID 34 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Network Trends Video Communication

35. Presentation_ID 35 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Network Trends Cloud Computing There are four primary types of clouds:  Public clouds  Private clouds  Custom clouds  Hybrid clouds

36. Presentation_ID 36 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Network Trends Data Centers A data center is a facility used to house computer systems and associated components including:  Redundant data communications connections  High-speed virtual servers (sometimes referred to as server farms or server clusters)  Redundant storage systems (typically uses SAN technology)  Redundant or backup power supplies  Environmental controls (e.g., air conditioning, fire suppression)  Security devices

37. Presentation_ID 37 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Networking Technologies for the Home Technology Trends in the Home

38. Presentation_ID 38 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Networking Technologies for the Home Powerline Networking

39. Presentation_ID 39 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Networking Technologies for the Home Wireless Broadband

40. Presentation_ID 40 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Future of Networking Network Security

41. Presentation_ID 41 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Network Security Security Threats The most common external threats to networks include:  Viruses, worms, and Trojan horses  Spyware and adware  Zero-day attacks, also called zero-hour attacks  Hacker attacks  Denial of service attacks  Data interception and theft  Identity theft

42. Presentation_ID 42 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Network Security Security Solutions Network security components often include:  Antivirus and antispyware  Firewall filtering  Dedicated firewall systems  Access control lists (ACL)  Intrusion prevention systems (IPS)  Virtual Private Networks (VPNs)

43. Presentation_ID 43 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Network Architectures Cisco Network Architectures

44. Presentation_ID 44 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Network Architectures Cisco Certified Network Associate (CCNA)

45. Presentation_ID 45 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Exploring the Networking Summary In this chapter, you learned:  Networks and the Internet have changed the way we communicate, learn, work, and even play.  Networks come in all sizes. They can range from simple networks consisting of two computers, to networks connecting millions of devices.  The Internet is the largest network in existence. In fact, the term Internet means a ‘network of networks. The Internet provides the services that enable us to connect and communicate with our families, friends, work, and interests.

46. Presentation_ID 46 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Exploring the Networking Summary In this chapter, you learned:  The network infrastructure is the platform that supports the network. It provides the stable and reliable channel over which communication can occur. It is made up of network components including end devices, intermediate device, and network media.  Networks must be reliable.  Network security is an integral part of computer networking, regardless of whether the network is limited to a home environment with a single connection to the Internet, or as large as a corporation with thousands of users.

47. Presentation_ID 47 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential Exploring the Networking Summary In this chapter, you learned:  The network infrastructure can vary greatly in terms of size, number of users, and number and types of services that are supported on it. The network infrastructure must grow and adjust to support the way the network is used. The routing and switching platform is the foundation of any network infrastructure.

48. Presentation_ID 48 © 2008 Cisco Systems, Inc. All rights reserved.Cisco Confidential