Discovery routing switching_chapter1_part1

Networking in the
Enterprise

Introducing Routing and Switching in the Enterprise –
Chapter 1

ITE I Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1

 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

ITE 1 Chapter 6 © 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


Describe an Enterprise Network
- Supporting the business enterprise

 A large business environment
 Provides mission-critical
with many users and
services and applications
locations.
 Requires centralized control:
 Example environment:
NOC
–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


 Various types of network traffic:
–Data files
–Email
–IP telephony
–Video applications

 99.999% uptime
 High-end equipment



 Network infrastructure  Key factors in network
–Reliability design
–Redundant power supplies –optimizing bandwidth
–Failover utilization
–ensuring security
–network performance.
 Proper network design
–to prevent any single point
of failure.


Describing the enterprise network
- Traffic Flow In The Enterprise
 Hierarchical design
 Access, Distribution, Core layers



 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.


- 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.


- Intranets and Extranets

 Enterprise networks contain both LAN and WAN
technologies
–Email
–Web
–FTP
–Telnet/SSH
–Discussion forums


- Intranets and Extranets
Intranet Extranet
 Provide access to local and  Privileged access for business
remote employees partners
 Private network  Private network
 Controlled by firewalls  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.


Summary
 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.



 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?


Discovery routing switching_chapter1_part1

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