Enterprise networks support large businesses and organizations through providing critical applications and services. They require high-availability networks with redundant hardware and 99.999% uptime. Enterprise networks include both local area networks and wide area networks, using a hierarchical design of access, distribution, and core layers. They integrate remote workers through virtual private networks that create encrypted tunnels for teleworking and allow access to applications from outside the main network.

1. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
Introducing Routing and Switching in the Enterprise –
Chapter 1
Networking in the
Enterprise

2. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
Objectives
 Describe the logical architecture and components of
an enterprise network
 Explain the types of applications and traffic flows
present on an enterprise network
 Examine how enterprises integrate remote workers
into their networks
– Define the role and importance of a telecommuter
– Describe the function and importance of VPNs

3. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
Enterprise Network
 A large business environment with many users and locations
• Manufacturers
• Large retail stores
• Restaurant and service franchises
• Utilities and government agencies
• Hospitals
• School systems
 Supported by an enterprise network
Support for critical applications
Support for converged network traffic
Need for centralized control
Support for diverse business requirements
 Provides mission-critical services and applications
 Requires centralized control: NOC

4. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4

5. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
Enterprise Network
 Network infrastructure
 99.999% uptime
 High-end equipment
 Fail-over capabilities
 Redundancy

6. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
 Hierarchical design
 Access, Distribution, Core layers
 Enterprise networks contain both LAN and WAN
technologies
Describe an Enterprise Network

7. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
Describe an Enterprise Network
Intranet
 Provide access to local and
remote employees
 Private network
 Controlled by firewalls
Extranet
 Privileged access for business
partners
 Private network
 Controlled access

8. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
Explain Types of Applications and Traffic
Flows within an Enterprise Network
 Local
 WAN
 External
 Optimized bandwidth
 Security

9. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
Explain Types of Applications and Traffic
Flows within an Enterprise Network
 Characteristics of different types of network traffic
 Network traffic prioritization
Classification
Pre-queuing
Queuing and scheduling
Post-queuing

10. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
 Factors affecting enterprise traffic
 Latency
 Jitter
 Quality of Service (QoS)
Explain Types of Applications and Traffic
Flows within an Enterprise Network

11. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
Examine How Enterprises Integrate Remote
Workers into their Networks
 Teleworking
 Telecommuting
 Teleconferencing

12. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
Examine How Enterprises Integrate Remote
Workers into their Networks
 Describe remote worker applications
 VoIP
 Sharing applications
 FTP and Telnet

13. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
Examine How Enterprises Integrate Remote
Workers into their Networks
 Function and importance of VPNs
 Encryption of traffic
 Tunnels
 Client/server application

14. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
Summary
 Enterprise networks support mission critical services
and traffic
 Enterprise design includes a campus, enterprise edge,
and service provider edge
 Intranets and extranets are private networks designed
for specific access privileges
 VPNs create encrypted tunnels for use by teleworkers

15. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15