ccna v5-s1-chapter 1
TRANSCRIPT
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© 2008 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 1
Chapter 1:Exploring the Network
Introduction to Networks
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Presentation_ID 2© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Chapter 1: Objectives
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.
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Presentation_ID 3© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Chapter 1
1.1 Globally Connected1.2 LANs, WANs, and the Internet 1.3 The Network as a Platform1.4 The Changing Network Environment1.5 Summary
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Presentation_ID 4© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Networking TodayNetworks in Our Past and Daily Lives
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Presentation_ID 5© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Networking TodayThe Global Community
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Presentation_ID 6© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Interconnecting our LivesNetworking 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
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Presentation_ID 7© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Providing Resources in a NetworkNetworks of Many Sizes
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Presentation_ID 8© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Providing Resources in a NetworkClients and Servers
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Presentation_ID 9© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Providing Resources in a NetworkPeer-to-Peer
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Presentation_ID 10© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
LANs, WANs, and InternetsComponents of a Network
There are three categories of network components: Devices Media Services
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Presentation_ID 11© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Components of a NetworkEnd 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)
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Presentation_ID 12© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Components of a NetworkNetwork Infrastructure Devices
Examples of intermediary network devices are: Network Access Devices (switches, and wireless access
points) Internetworking Devices (routers) Security Devices (firewalls)
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Presentation_ID 13© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Components of a NetworkNetwork Media
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Presentation_ID 14© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Components of a NetworkNetwork Representations
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Presentation_ID 15© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Components of a NetworkTopology Diagrams
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Presentation_ID 16© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
LANs and WANsTypes 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)
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Presentation_ID 17© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
LANs and WANsLocal Area Networks (LAN)
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Presentation_ID 18© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
LANs and WANsWide Area Networks (WAN)
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Presentation_ID 19© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
LANs, WANs, and InternetsThe Internet
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Presentation_ID 20© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The InternetIntranet and Extranet
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Presentation_ID 21© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
LANs, WANs, and InternetsInternet Access Technologies
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Presentation_ID 22© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Connecting to the InternetConnecting Remote Users to the Internet
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Presentation_ID 23© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Connecting to the InternetConnecting Businesses to the Internet
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Presentation_ID 24© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Converged NetworksThe Converging Network
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Presentation_ID 25© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Converged NetworksPlanning for the Future
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Presentation_ID 26© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reliable NetworkSupporting 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
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Presentation_ID 27© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reliable NetworkFault Tolerance in Circuit Switched Network
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Presentation_ID 28© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reliable NetworkPacket-Switched Networks
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Presentation_ID 29© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reliable NetworkScalable Networks
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Presentation_ID 30© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reliable NetworkProviding (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
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Presentation_ID 31© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reliable NetworkProviding Network Security
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Presentation_ID 32© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network TrendsNew trends
Some of the top trends include: Bring Your Own Device (BYOD) Online collaboration Video Cloud computing
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Presentation_ID 33© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network TrendsBring Your Own Device (BYOD)
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Presentation_ID 34© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network TrendsOnline Collaboration
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Presentation_ID 35© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network TrendsVideo Communication
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Presentation_ID 36© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network TrendsCloud Computing
There are four primary types of clouds: Public clouds Private clouds Custom clouds Hybrid clouds
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Presentation_ID 37© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network TrendsData 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
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Presentation_ID 38© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Networking Technologies for the HomeTechnology Trends in the Home
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Presentation_ID 39© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Networking Technologies for the HomePowerline Networking
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Presentation_ID 40© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Networking Technologies for the HomeWireless Broadband
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Presentation_ID 41© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Future of NetworkingNetwork Security
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Presentation_ID 42© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network SecuritySecurity 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
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Presentation_ID 43© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network SecuritySecurity 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)
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Presentation_ID 44© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network ArchitecturesCisco Network Architectures
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Presentation_ID 45© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network ArchitecturesCisco Certified Network Associate (CCNA)
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Presentation_ID 46© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Exploring the NetworkingSummary
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.
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Presentation_ID 47© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Exploring the NetworkingSummary
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.
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Presentation_ID 48© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Exploring the NetworkingSummary
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.
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Presentation_ID 49© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential