Discovery routing switching_chapter1_part1

© 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


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


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


Supported by an enterprise network

–Support for critical applications

–Support for converged network traffic

–Need for centralized control

–Support for diverse business requirements



Various types of network traffic:–Data files

–Email

–IP telephony

–Video applications

99.999% uptime

High-end equipment



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.



Hierarchical design

Access, Distribution, Core layers

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


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



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



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



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- 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





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.



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.


Describing the enterprise network- Intranets and Extranets

Enterprise networks contain both LAN and WAN technologies

–Email

–Web

–FTP

–Telnet/SSH

–Discussion forums


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


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.


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


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


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