Module 1- Scalable Networks pdf

Design the topology and network solutions... Characterizing the Existing Network and Sites Gathering as much information about the network as possible..  Define the scope of a network

BSCI Module 1 Lesson 2 - Scalable Networks

 Cisco PPDIOO

 Describe scalable network design

 Five Characteristics of a Scalable Network

 Making the Network Reliable and Available

 Making the Network Responsive

 Making the Network Efficient

 Making the Network Adaptable

 Making the Network Accessible But Secure

Cisco PPDIOO

Using the Design Methodology under PPDIOO

 Three steps in the design methodology:

1 Identify the customer requirements

2 Characterize the existing network and sites

3 Design the topology and network solutions

Identifying Customer Requirements

Characterizing the Existing Network and Sites

 Gathering as much information about the network as possible.

 Auditing and analyzing the network to add detail.

 Developing a summary report describing the health of the network.

 Use top-down design to for smaller, more manageable steps.

 Define the scope of a network design

 Develop the design by module

 Document the design, including implementation and migration

plans

 Verify the design.

Scalable Network Design

 The ECNM breaks the complex problem of network design into

smaller, more manageable problems Each level, or tier in the hierarchy, addresses a different set of problems This helps the designer optimize network hardware and software to perform specific roles For example, devices at the lowest tier are optimized

to accept traffic into a network and pass that traffic to the higher layers.

Scalable Network Design

 Layered models are useful because they facilitate modularity

Devices at each layer have similar and well-defined functions This allows administrators to easily add, replace, and remove individual pieces of the network

Five Characteristics of a Scalable Network

 Although every large internetwork has unique features,

all scalable networks have essential attributes in common A scalable network has five key

characteristics:

– Reliable and available

– Responsive

– Efficient

– Adaptable

– Accessible but secure

 The Cisco IOS offers a rich set of features that support

network scalability

Making the Network Reliable and Available

EIGRP, ISIS

be redundant EIGRP actually maintains a database of all alternate paths if the primary route is lost

traffic load across multiple links to the same destination

Making the Network Responsive

 Users expect network resources to respond quickly, as

if network applications were running from a local hard drive

 Networks must be configured to meet the needs of all

applications, especially time delay-sensitive

applications, such as voice and video

 Cisco IOS addresses priority and responsiveness

issues through queuing

– FIFO queuing, Priority queuing (PQ), Custom queuing (CQ), Weighted fair queuing (WFQ) and distributed WFQ (DWFQ), Class-based WFQ (CBWFQ) and Distributed CBWFQ

(DCBWFQ), Low Latency Queuing (LLQ)

Making the Network Efficient

 An efficient network should not waste bandwidth , especially over costly

WAN links To be efficient, routers should prevent unnecessary traffic from traversing the WAN and minimize the size and frequency of routing

updates with – Access lists

– Route maps

– Compression over WANs

– Route summarization

– Incremental updates

Making the Network Adaptable

Making the Network Accessible But Secure

Self Check

1 Name 5 characteristics os A Scalable Networks

2 Name 3 characteristics that Available and Reliable

Network Support

3 What is the main technique to meet Network

Responsive?

4 How to make an efficient network?

5 What is Network Adaptable?

 Reliable and available

 Responsive

 Efficient

 Adaptable

 Accessible but secure

Q and A