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Cisco Certified Design Associate

Exam: 640-863

Strategic network design

Cisco Service-Oriented Network Architecure (SONA) describes a model for design of networks. Cisco updated their designmodel from Architecture for Voice, Video and Integrated Data(AVVID) to Intelligent Information Network (IIN).

Cisco SONA three layeer design model

There are three faces in the IIN design.

Integrated transport: Voice, Video and Data are joined and transported together.
Integrated services: For exampel Storage (SAN), voice
Integrated Applications:

The Book

CCDA Official Exam Certification Guide

ISBN: 978-1-58720-177-6

Summary

IIN

IIN faser (Intelligent Information Network)
IIN Phase	Description
Integrated Transport	Joining voice, data and video in a transport network
Integrated Service	Ingegrate common services such as storage, virtualization of network systems
Integrated Application	The Network knows the applications, server virtualization

SONA Lag

SONA lag (Service-Oriented Network Architecure)
SONA lag	Description
Network Infrastructure layer	Contains enterprise servers, storage and clients
Interactive Service Layer	Optimizationof communication between applications and services by utilizing intelligent network services such as security, Voice, Virtualization og QoS
Application layer	Business applications (Programs) and collaboration tools (mail, voice ...)

SONA Infrastruktur services

SONA Infrastruktur services (Service-Oriented Network Architecure)
SONA lag	Description
Identity Services	Including AAA, NAC og NBAR
Mobility Services	Access to network services regardless of physical location
Storage Services	Storage of critical data
Compute Services	Enhancing compute resources (Virtualization)
Security Services	Security of all resources
Voice and collaboration Services	Shared services and programs

PPDIOO

PPDIOO Netværk livscyklus faser (Prepare, Plan, Design, Implement, Operate og Optimize)
PPDIOO aktivitet	Description
Prepare	DThe Prepare phase establishes organization and business requirements, develops a network strategy, and proposes a high-level architecture to support the strategy. Technologies that support the architecture are identified. This phase creates a business case to establish a financial justification for a network strategy.
Plan	The Plan phase identifies the network requirements by characterizing and assessing the network, performing a gap analysis against best-practice architectures, and looking at the operational environment. A project plan is developed to manage the tasks, responsible parties, milestones, and resources to do the design and implementation. This project plan is followed during all phases of the cycle.
Design	The network design is developed based on the technical and business requirements obtained from the previous phases. The network design provides high availability, reliability, security, scalability, and performance. The design includes network diagrams and an equipment list. The project plan is updated with more granular information for implementation. After the Design phase is approved, the Implement phase begins.
Implement	New equipment is installed and configured in the Implement phase. New devices replace or augment the existing infrastructure. The project plan is followed during this phase. Planned network changes should be communicated in change control meetings, with necessary approvals to proceed. Each step in the implementation should includes a description, detailed implementation guidelines, estimated time to implement, rollback steps in case of a failure, and any additional reference information. As changes are implemented they are also tested before moving to the Operate phase.
Operate	The Operate phase maintains the network’s day-to-day operational health. Operations include managing and monitoring network components, routing maintenance, managing upgrades, managing performance, and identifying and correcting network faults. This phase is the design’s final test. During operation, network management stations should monitor the network’s general health and generate traps when certain thresholds are reached.
Optimize	The Optimize phase involves proactive network management by identifying and resolving issues before they affect the network. The Optimize phase may create a modified network design if too many network problems arise, to improve performance issues, or to resolve application issues. The requirement for a modified network design leads to the network life cycle beginning.

Top-down eller Bottom-up design

Top-down design

Incorporates the organization’s requirements. Provides the big picture. The design meets current and future requirements.

Disadvantages:
- Time demanding
- Expensive short term.

Bottom-up design

The design is based on previous experience and allows for a quick solution.

Disadvantages:
- May result in inappropriate design.
- Organizational requirements are not included.

Sektioner i et Design dokument

Sektioner i et design dokument - hvad skal med
Sektion	Description
Introduction	describes the project’s purpose and the reasons for the network design.
Design Requirements	lists the organization’s requirements, constraints, and goals.
Existing Network Infrastructure	includes logical (Layer 3) topology diagrams; physical topology diagrams; audit results; routing protocols; a summary of applications; a list of network routers, switches, and other devices; configurations; and a description of issues.
Design	contains the specific design information, such as logical and physical topology, IP addressing, routing protocols, and security configurations.
Proof of Concept	results from live pilot or prototype testing.
Implementation plan	includes the detailed steps for the network staff to implement the new installation and changes.
Appendixes	contains additional information and configurations.

Optimering af kommunikationen mellem applikationer og services ved at anvende intelligente netværks services som for eksempel sikkerhed, virtualisering og QoS

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