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© 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 1
Chapter 1:
Exploring the Network
Introduction to Networks
Presentation_ID 2© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Chapter 1: Objectives
After completing this chapter, students will be able to:
 Explain how multiple networks are used in everyday life.
 Explain the topologies and devices used in a small- to medium-
sized business network.
 Explain the basic characteristics of a network that supports
communication in a small- to medium-sized business.
 Explain trends in networking that will affect the use of networks in
small to medium-sized businesses.
Presentation_ID 3© 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
© 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 4
1.1 Globally Connected
Presentation_ID 5© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Networking Today
Networks in Our Past and Daily Lives
Presentation_ID 6© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Networking Today
The Global Community
Presentation_ID 7© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Interconnecting Our Lives
Networking Impacts in Our Daily Lives
 Networks support the way we learn.
 Networks support the way we communicate.
 Networks support the way we work.
 Networks support the way we play.
Presentation_ID 8© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Providing Resources in a Network
Networks of Many Sizes
Presentation_ID 9© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Providing Resources in a Network
Clients and Servers
Presentation_ID 10© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Providing Resources in a Network
Peer-to-Peer
© 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 11
1.2 LANs, WANs, and the Internet
Presentation_ID 12© 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
Presentation_ID 13© 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 smart phones, tablets, PDAs, and
wireless debit / credit card readers and barcode scanners)
Presentation_ID 14© 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)
Presentation_ID 15© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Components of a Network
Network Media
Presentation_ID 16© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Components of a Network
Network Representations
Presentation_ID 17© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Components of a Network
Topology Diagrams
Presentation_ID 18© 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)
Presentation_ID 19© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
LANs and WANs
Local Area Networks (LAN)
Presentation_ID 20© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
LANs and WANs
Wide Area Networks (WAN)
Presentation_ID 21© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
LANs, WANs, and the Internet
The Internet
Presentation_ID 22© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
LANs, WANs, and the Internet
Intranet and Extranet
Presentation_ID 23© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Connecting to the Internet
Connecting Remote Users to the Internet
Presentation_ID 24© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Connecting to the Internet
Connecting Businesses to the Internet
© 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 25
1.3 The Network as a Platform
Presentation_ID 26© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Converged Networks
The Converging Network
Presentation_ID 27© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Converged Networks
Planning for the Future
Presentation_ID 28© 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
Presentation_ID 29© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reliable Network
Fault Tolerance in Circuit Switched Network
Presentation_ID 30© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reliable Network
Packet-Switched Networks
Presentation_ID 31© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reliable Network
Scalable Networks
Presentation_ID 32© 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.
Presentation_ID 33© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reliable Network
Providing Network Security
© 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 34
1.4 The Changing Network Environment
Presentation_ID 35© 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
Presentation_ID 36© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network Trends
Bring Your Own Device (BYOD)
The concept of any device, to any content, in anyway is a major global
trend that requires significant changes to the way devices are used.
This trend is known as Bring Your Own Device (BYOD).
Presentation_ID 37© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network Trends
Online Collaboration
Presentation_ID 38© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network Trends
Video Communication
Presentation_ID 39© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network Trends
Cloud Computing
Cloud computing offers the following potential benefits:
 Organizational flexibility
 Agility and rapid deployment
 Reduced cost of infrastructure
 Refocus of IT resources
 Creation of new business
models
Presentation_ID 40© 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
Presentation_ID 41© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Networking Technologies for the Home
Technology Trends in the Home
Presentation_ID 42© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Networking Technologies for the Home
Powerline Networking
Presentation_ID 43© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Networking Technologies for the Home
Wireless Broadband
Presentation_ID 44© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Future of Networking
Network Security
Presentation_ID 45© 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 (DoS) attacks
 Data interception and theft
 Identity theft
Presentation_ID 46© 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)
Presentation_ID 47© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network Architectures
Cisco Network Architectures
Presentation_ID 48© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network Architectures
Cisco Certified Network Associate (CCNA)
Presentation_ID 49© 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.
 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 devices, and network media.
Presentation_ID 50© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Exploring the Networking
Summary (cont.)
In this chapter, you learned:
 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.
 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.
Presentation_ID 51© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential

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CCNAv5 - S1: Chapter 1 Exploring The Network

  • 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 Chapter 1: Objectives After completing this chapter, students will be able to:  Explain how multiple networks are used in everyday life.  Explain the topologies and devices used in a small- to medium- sized business network.  Explain the basic characteristics of a network that supports communication in a small- to medium-sized business.  Explain trends in networking that will affect the use of networks in small to medium-sized businesses.
  • 3. Presentation_ID 3© 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
  • 4. © 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 4 1.1 Globally Connected
  • 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 Networking Today The Global Community
  • 7. Presentation_ID 7© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Interconnecting Our Lives Networking Impacts in Our Daily Lives  Networks support the way we learn.  Networks support the way we communicate.  Networks support the way we work.  Networks support the way we play.
  • 8. Presentation_ID 8© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Providing Resources in a Network Networks of Many Sizes
  • 9. Presentation_ID 9© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Providing Resources in a Network Clients and Servers
  • 10. Presentation_ID 10© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Providing Resources in a Network Peer-to-Peer
  • 11. © 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 11 1.2 LANs, WANs, and the Internet
  • 12. Presentation_ID 12© 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
  • 13. Presentation_ID 13© 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 smart phones, tablets, PDAs, and wireless debit / credit card readers and barcode scanners)
  • 14. Presentation_ID 14© 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)
  • 15. Presentation_ID 15© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Components of a Network Network Media
  • 16. Presentation_ID 16© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Components of a Network Network Representations
  • 17. Presentation_ID 17© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Components of a Network Topology Diagrams
  • 18. Presentation_ID 18© 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)
  • 19. Presentation_ID 19© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential LANs and WANs Local Area Networks (LAN)
  • 20. Presentation_ID 20© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential LANs and WANs Wide Area Networks (WAN)
  • 21. Presentation_ID 21© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential LANs, WANs, and the Internet The Internet
  • 22. Presentation_ID 22© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential LANs, WANs, and the Internet Intranet and Extranet
  • 23. Presentation_ID 23© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Connecting to the Internet Connecting Remote Users to the Internet
  • 24. Presentation_ID 24© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Connecting to the Internet Connecting Businesses to the Internet
  • 25. © 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 25 1.3 The Network as a Platform
  • 26. Presentation_ID 26© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Converged Networks The Converging Network
  • 27. Presentation_ID 27© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Converged Networks Planning for the Future
  • 28. Presentation_ID 28© 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
  • 29. Presentation_ID 29© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Reliable Network Fault Tolerance in Circuit Switched Network
  • 30. Presentation_ID 30© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Reliable Network Packet-Switched Networks
  • 31. Presentation_ID 31© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Reliable Network Scalable Networks
  • 32. Presentation_ID 32© 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.
  • 33. Presentation_ID 33© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Reliable Network Providing Network Security
  • 34. © 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 34 1.4 The Changing Network Environment
  • 35. Presentation_ID 35© 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
  • 36. Presentation_ID 36© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Network Trends Bring Your Own Device (BYOD) The concept of any device, to any content, in anyway is a major global trend that requires significant changes to the way devices are used. This trend is known as Bring Your Own Device (BYOD).
  • 37. Presentation_ID 37© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Network Trends Online Collaboration
  • 38. Presentation_ID 38© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Network Trends Video Communication
  • 39. Presentation_ID 39© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Network Trends Cloud Computing Cloud computing offers the following potential benefits:  Organizational flexibility  Agility and rapid deployment  Reduced cost of infrastructure  Refocus of IT resources  Creation of new business models
  • 40. Presentation_ID 40© 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
  • 41. Presentation_ID 41© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Networking Technologies for the Home Technology Trends in the Home
  • 42. Presentation_ID 42© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Networking Technologies for the Home Powerline Networking
  • 43. Presentation_ID 43© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Networking Technologies for the Home Wireless Broadband
  • 44. Presentation_ID 44© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Future of Networking Network Security
  • 45. Presentation_ID 45© 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 (DoS) attacks  Data interception and theft  Identity theft
  • 46. Presentation_ID 46© 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)
  • 47. Presentation_ID 47© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Network Architectures Cisco Network Architectures
  • 48. Presentation_ID 48© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Network Architectures Cisco Certified Network Associate (CCNA)
  • 49. Presentation_ID 49© 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.  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 devices, and network media.
  • 50. Presentation_ID 50© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Exploring the Networking Summary (cont.) In this chapter, you learned:  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.  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.
  • 51. Presentation_ID 51© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential