Post on 30-Jul-2015
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE I Chapter 6 1
Introducing Routing and Switching in the Enterprise – Chapter 1
Networking in the Enterprise
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 2
Describing the enterprise network–Supporting the business enterprise
–Traffic Flow In The Enterprise
–Enterprise LANs and WAN
–Intranets and Extranets
Identifying Enterprise Application–Traffic Flow Patterns
–Applications and Traffics on the Enterprise Network
–Network Traffic Prioritization
Supporting Network Worker–Teleworking
–Virtual Private Network
Summary
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 3
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 4
Describe an Enterprise Network - Supporting the business enterprise
A large business environment with many users and locations.
Example environment:–Manufacturers
–Large retail stores
–Restaurant and service franchises
–Utilities and government agencies
–Hospitals
–School systems
Provides mission-critical services and applications
Requires centralized control: NOC
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Supported by an enterprise network
–Support for critical applications
–Support for converged network traffic
–Need for centralized control
–Support for diverse business requirements
Describe an Enterprise Network - Supporting the business enterprise
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 6
Various types of network traffic:–Data files
–IP telephony
–Video applications
99.999% uptime
High-end equipment
Describe an Enterprise Network - Supporting the business enterprise
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Network infrastructure–Reliability
–Redundant power supplies
–Failover
Proper network design–to prevent any single point of failure.
Key factors in network design
–optimizing bandwidth utilization
–ensuring security
–network performance.
Describe an Enterprise Network - Supporting the business enterprise
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 8
Hierarchical design
Access, Distribution, Core layers
Describing the enterprise network- Traffic Flow In The Enterprise
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 9
Describing the enterprise network- Traffic Flow In The Enterprise
Access layer - connectivity for the users. –Provides a connection point for end-user devices to the network
–Allows multiple hosts to connect to other hosts through a network device such as a switch
–Exists on the same logical network
–Forwards traffic to other hosts on the same logical network
–Passes traffic to the Distribution Layer for delivery if the message is destined for a host on another network
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 10
Distribution layer - to forward traffic from one local network to another.
–Provides a connection point for separate local networks–Controls the flow of information between local networks–Ensures that traffic between hosts on the same local network stays local–Passes on traffic that is destined for other networks–Filters incoming and outgoing traffic for security and traffic management purposes–Contains more powerful switches and routers than the Access Layer–Passes data to the Core Layer for delivery to a remote network if the local network is not directly connected
Describing the enterprise network- Traffic Flow In The Enterprise
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 11
Core layer - represents a high-speed backbone layer between dispersed end networks.
–Provides a high-speed backbone layer with redundant (backup) connections
–Transports large amounts of data between multiple end networks
–Includes very powerful, high-speed switches and routers
Describing the enterprise network- Traffic Flow In The Enterprise
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 12
The Cisco Enterprise Architectures divides the network into functional components:
–Enterprise Campus: Consists of the campus infrastructure with server farms and network management
–Enterprise Edge: Consists of the Internet, VPN, and
WAN modules connecting the
enterprise with the service provider's
network
–Service Provider Edge: –Provides Internet, Public Switched
–Telephone Network (PSTN),
–and WAN services
Describing the enterprise network- Traffic Flow In The Enterprise
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Enterprise Composite Network Model (ECNM) - edge device.
–Intrusion detection systems (IDS)
–intrusion prevention systems (IPS)
A failure domain is the area of a network impacted when a key device or service experiences problems.
Describing the enterprise network- Traffic Flow In The Enterprise
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 14
Describing the enterprise network- Enterprise LANs and WAN
Enterprise networks contain both LAN and WAN:–LANs are private and under the control of a single person or organization.
–WANs can be privately owned or purchase from ISP
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 15
Describing the enterprise network- Enterprise LANs and WAN
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 16
Describing the enterprise network- Enterprise LANs and WAN
Features of a LAN:
The organization has the responsibility of installing and managing the infrastructure.
Ethernet is the most common technology used.
The focus of the network is in the Access and Distribution Layers.
The LAN connects users, provides support for localized applications and server farms.
Connected devices are usually in the same local area, such as a building or a campus.
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 17
Describing the enterprise network- Enterprise LANs and WAN
Features of a WAN: Connected sites are usually geographically dispersed. Connectivity to the WAN requires a device such as a modem or
CSU/DSU to put the data in a form acceptable to the network of the service provider.
Services are provided by an ISP. WAN services include T1/T3, E1/E3, DSL, Cable, Frame Relay, and ATM.
The ISP has the responsibility of installing and managing the infrastructure.
The edge devices modify the Ethernet encapsulation to a serial WAN encapsulation.
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 18
Describing the enterprise network- Intranets and Extranets
Enterprise networks contain both LAN and WAN technologies
–Web
–FTP
–Telnet/SSH
–Discussion forums
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 19
Describing the enterprise network- Intranets and ExtranetsIntranet
Provide access to local and remote employees
Private network
Controlled by firewalls
Extranet
Privileged access for business partners
Private network
Controlled access
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 20
Summary
A large business environment with many users and locations or many systems is referred to as an enterprise.
The enterprise network supports mission critical applications, network traffic, centralized control and diverse business needs.
The enterprise network: Provides 99.999% uptime. Uses both LAN and WAN components. Utilizes many different types of technology. Makes use of services of ISPs Carries many types of traffic including voice, video and data.
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 21
Enterprise Campus: Consists of the campus infrastructure with server farms and network management.
Enterprise Edge: Consists of the internet, VPN and WAN modules connecting the enterprise with the server provider’s network.
Server Provider Edge: Provides Internet, Public Switched Telephoned Network (PSTN) and WAN services.
Failure Domain: describe the devices impacted on a portion of a network when a key device or service experiences problems.
An intranet is a private network that utilizes TCP/IP and other services to provide private services for company employees.
If vendor and customers, and other outside individuals access the intranet, it is known as an extranet.
Summary
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 22
Businesses rely on their network infrastructure to provide mission critical services. Explain what this means.
How to prevent any single point of failure in an enterprise network?
Why would an enterprise network use the Core Layer services offered by an ISP?
What three things can be found at the enterprise edge?
What is the area of a network impacted when a key device or service experiences problems?
What are three methods used by businesses to allow customers into their network?
Describe an Enterprise Network