Introduction to Networks v5.1

Chapter 1:

Explore the Network

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1.0 Introduction

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

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Upon completion of this section, you should be able to:

• Explain how networks affect the way we interact, learn, work, and play.

• Explain how host devices can be used as clients, servers, or both.

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Networks support the way we:

• Learn

• Communicate

• Work

• Play

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Upon completion of this section, you should be able to:

• Explain the use of network devices.

• Compare the devices and topologies of a LAN to the devices and topologies of a WAN.

• Describe the basic structure of the Internet.

• Explain how LANs and WANs interconnect to the Internet.

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Network Interface Card

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Physical Topology

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Logical Topology

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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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LANs separated by geographic distance are connected by a network known as a WAN.

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LANs use WAN services to interconnect.

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• Internet Service Provider (ISP)

• Broadband cable

• Broadband Digital Subscriber Line (DSL)

• Wireless WANs

• Mobile Services

• Business DSL

• Leased Lines

• Metro Ethernet

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Upon completion of this section, you should be able to:

• Explain the concept of a converged network.

• Describe the four basic requirements of a reliable network.

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Upon completion of this section, you should be able to:

• Explain how trends such as BYOD, online collaboration, video, and cloud computing are changing the way we interact.

• Explain how networking technologies are changing the home environment.

• Identify basic security threats and solutions for both small and large networks.

• Describe the importance of understanding the underlying switching and routing infrastructure of a network.

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Top trends include:

• Bring Your Own Device (BYOD)

• Online collaboration

• Video communications

• Cloud computing

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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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Minimum solutions:

• Antivirus and antispyware

• Firewall filtering

Additional solutions:

• Dedicated firewall systems

• Access control lists (ACL)

• Intrusion prevention systems (IPS)

• Virtual Private Networks (VPNs)

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Chapter Objectives:

• Explain how multiple networks are used in everyday life.

• Describe 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.

Thank you.