BSCI Module 1

8/8/2019 BSCI Module 1

1/12

1 2


2/12

The Cisco vision of the future IIN encompasses these features:

Integration of networked resources and information assets that

have been largely unlinked: The modern converged networks withintegrated voice, video, and data require that Information Technology (IT)departments more closely link the IT infrastructure with the network.

Intelligence across multiple products and infrastructure layers: Theintelligence built into each component of the network is extended network-

- - .

Active participation of the network in the delivery of services andapplications: With added intelligence, the IIN makes it possible for thenetwork to actively manage, monitor, and optimize service and applicationdelivery across the entire IT environment.

, ,bandwidth for users, and access to applications. The IIN offers end-to-endfunctionality and centralized, unified control that promotes true businesstransparency and agility.

3

Cisco SONA is an architectural framework that guides the evolution ofenterprise networks to an IIN. The Cisco SONA framework provides

several advantages to enterprises, such as the following:Outlines the path towards the IIN

Illustrates how to build integrated systems across a fully converged IIN

Improves flexibility and increases efficiency, which results in optimizedapplications, processes, and resources.

4


3/12

The Cisco SONA framework shows how integrated systems can both allow a dynamic,ex e arc ec ure, an prov e or opera ona e c ency roug s an ar za on an

virtualization. It brings forth the notion that the network is the common element thatconnects and enables all components of the IT infrastructure. Cisco SONA outlines thesethree layers of the IIN:

Network infrastructure layer: This layer is where all the IT resources areinterconnected across a converged network foundation. The IT resources includeservers, storage, and clients. The network infrastructure layer represents how theseresources exist in different places in the network, including the campus, branch, datacenter, WAN and Metropolitan Area Network (MAN), and teleworker. The objective forcustomers in this layer is to have anywhere and anytime connectivity.

Interactive services layer: This layer enables efficient allocation of resources to

applications and business processes that are delivered through the networkedinfrastructure. This layer comprises these services:

o ce an co a ora on servces

Mobility services

Security and identity services

Storage services

Computer services

Application networking services

5

Network infrastructure virtualization

Services management

Adaptive management services

Application layer: This layer includes business applications and collaborationapplications. The objective for customers in this layer is to meet business requirementsand achieve efficiencies b levera in the interactive services la er.

The Cisco Enterprise Architecture helps companies to protect, optimize,and grow the infrastructure that supports business processes. The

architecture provides integration of the entire networkcampus, datacenter, WAN, branches, and teleworkersoffering staff secure access tothe tools, processes, and services.

6


4/12

The simplest Ethernet network infrastructure is composed of a singlecollision and broadcast domain. This type of network is referred to as a

flat network because any traffic that is transmitted within it is seen by allof the interconnected devices, even if they are not the intendeddestination of the transmission. The benefit of this type of network is that itis very simple to install and configure, so it is a good fit for homenetworking and small offices. The downside of a flat network infrastructureis that it does not scale well as demands on the network increase.

Some of the issues with nonhierarchical networks:

Traffic collisions increase as devices are added, impeding traffic flow onthe network.

Broadcast traffic increases as devices are added to the network, causingoverutilization of network resources.

Problem isolation on a large flat network can be difficult.

7

Layer 2 switches can significantly improve performance in a carrier sensemultiple access collision detect (CSMA/CD) network when used in place of

hubs. This is because each switch port represents a single collisiondomain, and the device connected to that port does not have to competewith other devices to access the media. Ideally, every host on a givennetwork segment is connected to its own switch port, thus eliminating allmedia contention as the switch manages network traffic at Layer 2. Anadditional benefit of Layer 2 switching is that large broadcast domains canbe broken up into smaller segments by assigning switch ports to differentVLAN segments.

For all their benefits, some drawbacks still exist in nonhierarchical

switched networks.If switches are not configured with VLANs, very large broadcast domainsmay be created.

If VLANs are created, traffic cannot move between VLANs using onlyLayer 2 devices.

As the Layer 2 network grows, the potential for bridge loops increases.Therefore, the use of a Spanning Tree Protocol (STP) becomesimperative

8


5/12


6/12


7/12


8/12


9/12

17

1. Network infrastructure layer, Interactive services layer, Applicationlayer.

2. Three phases in building an IIN are: Integrated transport, Integratedservices, Integrated applications.

3. Large collision domain, Large broadcast domain, High latency,Difficult to troubleshoot.

4. Building Access, Building Distribution, and Building Core layers.

5. Enterprise Campus, Enterprise Edge, Service Provider Edge.

18


10/12

19 20


11/12

21 22


12/12

23

Documents

BSCI Module 1