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©2014 Amir Jafari – www.amir-Jafari.com
Network Design
Agenda
©2014 Amir Jafari – www.amir-Jafari.com
 Introduction
 Analyze the Customer Requirements
 Characterize the Exist...
Introduction
©2014 Amir Jafari – www.amir-Jafari.com
 Why do we need modern network design?
 Rise of new technologies
 ...
Introduction
©2014 Amir Jafari – www.amir-Jafari.com
 Objective
present a systematic design methodology that meet a custo...
Analyze the Customer
Requirements
©2014 Amir Jafari – www.amir-Jafari.com
Step 1. Identify network applications and servic...
Analyze the Customer
Requirements
©2014 Amir Jafari – www.amir-Jafari.com
Characterize the Existing Network
and Sites
©2014 Amir Jafari – www.amir-Jafari.com
Step 1. Gather existing documentation ...
Design the Network Topology and
Solutions
©2014 Amir Jafari – www.amir-Jafari.com
Top-Down Approach
Design a Network Topology
©2014 Amir Jafari – www.amir-Jafari.com
Modular
Network
Design
Design a Model for Network Layer
Addressing and Naming
©2014 Amir Jafari – www.amir-Jafari.com
 Using a Structured Model ...
Select the Switching and Routing
Protocols
©2014 Amir Jafari – www.amir-Jafari.com
Making Decisions
Select the Switching and Routing
Protocols
©2014 Amir Jafari – www.amir-Jafari.com
 Selecting Switching Protocols
VLANNIG...
Select the Switching and Routing
Protocols
©2014 Amir Jafari – www.amir-Jafari.com
Routing
Protocol
Comparisons
Network Security Design
©2014 Amir Jafari – www.amir-Jafari.com
 Security Strategy
 Identifying Network Assets
 Analyzi...
Network Management Design
©2014 Amir Jafari – www.amir-Jafari.com
 Network Management Functional Areas
 Fault management...
Optimize the Network Design
©2014 Amir Jafari – www.amir-Jafari.com
 Quality Issues in Converged Networks
 Bandwidth cap...
Optimize the Network Design
©2014 Amir Jafari – www.amir-Jafari.com
 QoS Models
 Best effort
 IntServ
 DiffServ
Select Technologies and
Devices
©2014 Amir Jafari – www.amir-Jafari.com
 Cabling Topologies and Types of Cable for Campus...
Select Technologies and
Devices
©2014 Amir Jafari – www.amir-Jafari.com
 Selecting Technologies for Enterprise Networks
...
Test the Network Design
©2014 Amir Jafari – www.amir-Jafari.com
 Pilot and Prototype Tests
 Writing and Implementing a T...
Document the Network Design
©2014 Amir Jafari – www.amir-Jafari.com
 Executive Summary
 Project Goal
 Project Scope
 D...
References
©2014 Amir Jafari – www.amir-Jafari.com
[1] John Tiso,“Designing Cisco Network Service Architectures (ARCH)”,
C...
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Network design

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Analyze the Customer Requirements
Characterize the Existing Network and Sites
Design the Network Topology and Solutions
Design a Network Topology
Design a Model for Network Layer Addressing and Naming
Select the Switching and Routing Protocols
Network Security Design
Network Management Design
Optimize the Network Design
Select Technologies and Devices
Test the Network Design
Document the Network Design

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Network design

  1. 1. ©2014 Amir Jafari – www.amir-Jafari.com Network Design
  2. 2. Agenda ©2014 Amir Jafari – www.amir-Jafari.com  Introduction  Analyze the Customer Requirements  Characterize the Existing Network and Sites  Design the Network Topology and Solutions  Design a Network Topology  Design a Model for Network Layer Addressing and Naming  Select the Switching and Routing Protocols  Network Security Design  Network Management Design  Optimize the Network Design  Select Technologies and Devices  Test the Network Design  Document the Network Design
  3. 3. Introduction ©2014 Amir Jafari – www.amir-Jafari.com  Why do we need modern network design?  Rise of new technologies  Traditional network boundaries have been removed  Complexities of networks  Reduce the time to develop and market products  What affect Network Design?  Business drivers Return on investment, Regulation, Competitiveness  Technology drivers Removal of borders, Virtualization, Growth of applications
  4. 4. Introduction ©2014 Amir Jafari – www.amir-Jafari.com  Objective present a systematic design methodology that meet a customer’s business and technical goals  Network Design Methodology Step 1. Analyze Customer Requirements Step 2. Characterize the Existing Network and Sites Step 3. Design the Network Topology and Solutions
  5. 5. Analyze the Customer Requirements ©2014 Amir Jafari – www.amir-Jafari.com Step 1. Identify network applications and services. Step 2. Define the organizational goals. Step 3. Define the possible organizational constraints. Step 4. Define the technical goals. Step 5. Define the possible technical constraints.
  6. 6. Analyze the Customer Requirements ©2014 Amir Jafari – www.amir-Jafari.com
  7. 7. Characterize the Existing Network and Sites ©2014 Amir Jafari – www.amir-Jafari.com Step 1. Gather existing documentation and query the organization Step 2. Perform a network audit Step 3. Use traffic analysis  Identifying Major Traffic Sources and Stores  Characterizing Types of Traffic Flow for New Network Applications  Characterizing Traffic Behavior  Characterizing Quality of Service Requirements
  8. 8. Design the Network Topology and Solutions ©2014 Amir Jafari – www.amir-Jafari.com Top-Down Approach
  9. 9. Design a Network Topology ©2014 Amir Jafari – www.amir-Jafari.com Modular Network Design
  10. 10. Design a Model for Network Layer Addressing and Naming ©2014 Amir Jafari – www.amir-Jafari.com  Using a Structured Model for Network Layer Addressing  Using a Hierarchical Model for Assigning Addresses  Administering Addresses by a Central Authority  Using Dynamic Addressing for End Systems  Designing a Model for Naming
  11. 11. Select the Switching and Routing Protocols ©2014 Amir Jafari – www.amir-Jafari.com Making Decisions
  12. 12. Select the Switching and Routing Protocols ©2014 Amir Jafari – www.amir-Jafari.com  Selecting Switching Protocols VLANNIG, VLAN Trunking Protocols (ISL, Dot1q), inter-VLAN Routing, VTP, STP, RSTP, PVST+, CEF  Selecting Routing Protocols  Characterizing Routing Protocols Distance-vector, link-state, or hybrid, Interior or exterior, Classless or classful, Fixed-length or variable-length subnet masks (VLSM), Flat or hierarchical, IPv4 or IPv6  Routing Protocol Metrics and Loop Prevention  Scalability Constraints for Routing Protocols
  13. 13. Select the Switching and Routing Protocols ©2014 Amir Jafari – www.amir-Jafari.com Routing Protocol Comparisons
  14. 14. Network Security Design ©2014 Amir Jafari – www.amir-Jafari.com  Security Strategy  Identifying Network Assets  Analyzing Security Risks  Analyzing Security Requirements  Developing a Security Plan  Developing a Security Policy  Developing Security Procedures  Maintaining Security  Security Mechanisms Physical Security, Authentication, Authorization, Accounting (Auditing), Data Encryption, Packet Filters, Firewalls, Intrusion Detection and Prevention Systems  Monitoring, Analysis, and Correlation
  15. 15. Network Management Design ©2014 Amir Jafari – www.amir-Jafari.com  Network Management Functional Areas  Fault management  Configuration management  Accounting management  Performance management  Security management  Network Management Architectures  A managed device  An agent  A network management system (NMS)  Selecting Network Management Tools and Protocols
  16. 16. Optimize the Network Design ©2014 Amir Jafari – www.amir-Jafari.com  Quality Issues in Converged Networks  Bandwidth capacity  End-to-end delay (both fixed and variable):  Variation of delay (also called jitter)  Packet loss  QoS The main categories of mechanism  Classification and marking  Congestion management  Congestion avoidance  Policing and shaping  Link efficiency
  17. 17. Optimize the Network Design ©2014 Amir Jafari – www.amir-Jafari.com  QoS Models  Best effort  IntServ  DiffServ
  18. 18. Select Technologies and Devices ©2014 Amir Jafari – www.amir-Jafari.com  Cabling Topologies and Types of Cable for Campus Networks  Campus- and building-cabling topologies  Cables between buildings  Location of telecommunications closets  Vertical cabling between floors  Horizontal cabling within floors  Criteria for Selecting Internetworking Devices Number of ports, Processing speed, Amount of memory, Throughput in packets per second, LAN and WAN technologies supported, Media (cabling) supported, Support for redundant power supplies, Support for QoS features,…
  19. 19. Select Technologies and Devices ©2014 Amir Jafari – www.amir-Jafari.com  Selecting Technologies for Enterprise Networks  Remote-access technologies  Point-to-Point Protocol (PPP)  Cable modems  Digital subscriber line (DSL)  WAN technologies  Leased lines  Synchronous Digital Hierarchy (SDH)  Frame Relay
  20. 20. Test the Network Design ©2014 Amir Jafari – www.amir-Jafari.com  Pilot and Prototype Tests  Writing and Implementing a Test Plan for the Network Design  Tools for Testing a Network Design
  21. 21. Document the Network Design ©2014 Amir Jafari – www.amir-Jafari.com  Executive Summary  Project Goal  Project Scope  Design Requirements  Current State of the Network  Logical Design  Network Layer Addressing and Naming  Switching and Routing Protocols  Security Design  Management Design  Quality of service (QOS)  Technologies and Devices
  22. 22. References ©2014 Amir Jafari – www.amir-Jafari.com [1] John Tiso,“Designing Cisco Network Service Architectures (ARCH)”, Cisco Press, USA, 2012 [2] Anthony Bruno,Steve Jordan,“CCDA 640-864 Official Cert Guide”, Cisco Press, USA, 2011 [3] Priscilla Oppenheimer,“Top-Down Network Design”, Cisco Press, USA, 2012 [4] “Cisco SAFE Reference Guide”, Cisco Systems, Inc., USA, 2010

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