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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.

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

1.1 Globally Connected

Networking Today
Networks in Our Past and Daily Lives

Networking Today
The Global Community

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.

Providing Resources in a Network
Networks of Many Sizes

Clients and Servers

Peer-to-Peer

1.2 LANs, WANs, and the Internet

LANs, WANs, and Internets
Components of a Network
There are three categories of network components:
 Devices
 Media
 Services

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)

Network Infrastructure Devices
Examples of intermediary network devices are:
 Network Access Devices (switches, and wireless access points)
 Internetworking Devices (routers)
 Security Devices (firewalls)

Network Media

Network Representations

Topology Diagrams

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)

LANs and WANs
Local Area Networks (LAN)

LANs and WANs
Wide Area Networks (WAN)

LANs, WANs, and the Internet
The Internet

LANs, WANs, and the Internet
Intranet and Extranet

Connecting to the Internet
Connecting Remote Users to the Internet

Connecting to the Internet
Connecting Businesses to the Internet

1.3 The Network as a Platform

Converged Networks
The Converging Network

Converged Networks
Planning for the Future

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

Reliable Network
Fault Tolerance in Circuit Switched Network

Reliable Network
Packet-Switched Networks

Reliable Network
Scalable Networks

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.

Reliable Network
Providing Network Security

1.4 The Changing Network Environment

Network Trends
New trends
Some of the top trends include:
 Bring Your Own Device (BYOD)
 Online collaboration
 Video
 Cloud computing

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).

Network Trends
Online Collaboration

Network Trends
Video Communication

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

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

Networking Technologies for the Home
Technology Trends in the Home

Powerline Networking

Wireless Broadband

Future of Networking
Network Security

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

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)

Network Architectures
Cisco Network Architectures

Network Architectures
Cisco Certified Network Associate (CCNA)

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.

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.

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