Study Guide Cisco Certified Design Expert (CCDE 400-007) Exam (eBook)

Anand Vemula (Autor)

eBook Download: EPUB

2025 | 1. Auflage
75 Seiten
Publishdrive (Verlag)
9780000972538 (ISBN)

Infos

The Cisco Certified Design Expert (CCDE 400-007) Exam Study Guide is a comprehensive resource tailored for network architects and senior engineers preparing for Cisco's expert-level design certification. The guide systematically explores the conceptual, technical, and strategic dimensions of network design, aligning with the CCDE blueprint to ensure relevance and depth.

The book begins with foundational network design principles, covering methodologies like TOGAF and PBA, and progresses through business requirement gathering, high availability, and abstraction techniques. It provides deep dives into transport technologies across Layers 1-3, including MPLS, DWDM, and SD-WAN, and outlines optical and WAN design strategies.

Infrastructure services are thoroughly explained, featuring address planning, advanced routing protocols like BGP and OSPF, multicast strategies, QoS design, and services such as NTP, DHCP, and DNS. It addresses network virtualization using technologies like VRF, VXLAN, and LISP.

Security design is a core focus, with chapters on threat modeling, segmentation, Zero Trust, IAM integration, and perimeter defense. The guide also covers automation and assurance, delving into model-driven architectures, telemetry, APIs, and intent-based networking.

Operational topics include management architectures like FCAPS, telemetry tools, fault handling, and capacity planning. Domain-specific designs-campus, data center, cloud, and service provider-are thoroughly explored. Emerging technologies like SDN, NFV, 5G, AI/ML, and green networking round out the content.

Finally, real-world case studies and scenario-based exercises cultivate the analytical and documentation skills needed to pass the exam and succeed in practical roles. This study guide is both a technical manual and strategic roadmap for mastering expert-level network design.

Textauszug

1. Network Design Fundamentals

1.1 Introduction to Network Design Principles

Network design principles form the foundation of building scalable, efficient, and manageable networks. The design must balance technical requirements with business goals, ensuring the network can deliver services reliably and securely.

The core principles include:

• Scalability: The design must accommodate future growth in terms of users, devices, traffic volume, and services without major redesigns. It involves planning address schemes, capacity, and hierarchical topology.
• Resiliency and High Availability: Networks must be able to withstand failures without service disruption. This includes redundant paths, failover mechanisms, and fast convergence of routing protocols.
• Performance and Optimization: The design should ensure low latency, minimal packet loss, and adequate bandwidth. Performance depends on topology, QoS mechanisms, and traffic engineering.
• Security: Security should be integrated from the start, including segmentation, access controls, and threat mitigation techniques.
• Manageability and Operational Simplicity: Designs must be straightforward to operate and maintain. This includes consistent configuration standards, clear documentation, and automation readiness.
• Flexibility and Adaptability: The network should adapt to evolving technologies, changing business requirements, and new applications.
• Cost-effectiveness: Design choices should balance functionality and cost, both in initial CAPEX and ongoing OPEX.

Other principles include:

• Modularity: Breaking down the network into functional building blocks or modules simplifies design, troubleshooting, and scaling.
• Hierarchy: Using layered models (core, distribution, access) to separate concerns and simplify routing.
• Standardization: Using open standards and protocols to ensure interoperability and vendor neutrality.
• Documentation: Thorough documentation ensures repeatability and knowledge transfer.

The application of these principles depends on the network type (enterprise, data center, service provider), organizational priorities, and technology choices.

1.2 Design Lifecycle and Methodologies (PBA, TOGAF, etc.)

Network design is not a one-time activity but a continuous lifecycle encompassing assessment, design, implementation, validation, and ongoing optimization. Several methodologies help structure this lifecycle.

1.2.1 The Design Lifecycle

The typical lifecycle phases include:

• Assessment and Discovery: Collect detailed information on current infrastructure, business goals, traffic patterns, and constraints. Understand the environment and existing pain points.
• Requirements Analysis: Document business, technical, security, and operational requirements. Prioritize these requirements and resolve conflicts.
• Design and Architecture: Develop high-level and detailed designs. This includes topology diagrams, addressing plans, routing strategies, security policies, and management approach.
• Validation and Testing: Simulate, prototype, or lab test the design to verify functionality, scalability, and performance.
• Implementation Planning: Create detailed deployment plans including cutover, fallback, resource allocation, and timelines.
• Deployment and Migration: Execute the implementation with minimal disruption.
• Operations and Maintenance: Monitor, manage, and optimize the network continuously.
• Review and Iteration: Conduct post-implementation reviews and update the design as business or technical needs change.

1.2.2 Design Methodologies

• PBA (Protocol-Based Architecture): Focuses on designing around the protocols best suited for the application and environment. It emphasizes understanding the protocol behaviors and interactions, ensuring design decisions are protocol-aware.
• TOGAF (The Open Group Architecture Framework): A comprehensive enterprise architecture methodology that includes a detailed Architecture Development Method (ADM). It helps align IT design with business goals, covering phases like architecture vision, business architecture, information systems architecture, and technology architecture.

TOGAF emphasizes stakeholder involvement, requirements management, and governance — critical for large-scale network designs.

• Cisco Lifecycle Services Approach: Cisco promotes a lifecycle methodology including Plan, Design, Implement, Operate, and Optimize phases. It integrates Cisco best practices and tools like Cisco Validated Designs (CVDs).
• Design Thinking and Agile Design: Modern networks increasingly adopt iterative and incremental approaches. Feedback loops and rapid prototyping help tailor design to evolving needs.
• Model-Based Design: Using abstraction layers and models (logical, physical, conceptual) to visualize and analyze the design before deployment.

1.2.3 Design Documentation and Governance

Governance ensures design consistency, adherence to standards, and quality control. Documentation includes architecture blueprints, configuration standards, and design decisions rationale.

1.3 Business and Technical Requirements Gathering

Requirements gathering is the critical step bridging business needs and technical design. Inadequate or incorrect requirements lead to costly redesigns.

1.3.1 Types of Requirements

• Business Requirements: Define what the organization needs to achieve. Examples:

• Support for new applications or services (e.g., video conferencing).
• Compliance with regulations.
• Support for mergers, acquisitions, or new geographic locations.
• Cost targets and ROI expectations.
• User experience requirements like availability and latency.

• Technical Requirements: Define how the network must perform and behave, including:

• Bandwidth and throughput needs.
• Latency and jitter tolerances.
• Security policies.
• Availability and redundancy targets.
• Integration with existing infrastructure.
• Manageability and monitoring.

• Operational Requirements: Define how the network will be operated, including:

• Staffing and skills.
• Tools and automation.
• Maintenance windows.
• Change management procedures.

• Compliance and Regulatory Requirements: Legal and policy-driven constraints, such as data sovereignty, auditability, and security standards.

1.3.2 Gathering Techniques

• Stakeholder Interviews: Engage business leaders, application owners, network operations, and security teams to capture diverse perspectives.
• Workshops and Focus Groups: Facilitated sessions to discuss needs and conflicts.
• Surveys and Questionnaires: Structured data collection from end-users and technical staff.
• Document Analysis: Review existing policies, SLAs, past incident reports, and previous designs.
• Traffic and Network Analysis: Using monitoring tools to analyze current utilization and performance.
• Future Projections: Estimating growth trends, new technologies, and expected changes.

1.3.3 Requirements Prioritization

Business and technical needs often conflict or exceed budget constraints. Prioritization frameworks (e.g., MoSCoW — Must have, Should have, Could have, Won’t have) help focus on critical requirements.

1.3.4 Translating Requirements into Design Criteria

Each requirement maps to design criteria that influence technology selection, topology, capacity planning, and policies. For example, a requirement for 99.999% uptime leads to redundant paths and high availability mechanisms.

1.4 High Availability and Resiliency Concepts

High availability (HA) and resiliency are critical for mission-critical networks. They ensure minimal downtime and service continuity in face of failures.

1.4.1 Definitions

• High Availability: The design goal to minimize downtime to an acceptable level, often expressed as "nines" of availability (e.g., 99.99% uptime).
• Resiliency: The network’s ability to recover from faults or failures gracefully and continue operating.

1.4.2 Types of Failures

Failures can be:

• Hardware: Device or link failures.
• Software: Bugs or crashes.
• Configuration errors.
• External: Power failures, disasters.

1.4.3 Design Techniques for HA and Resiliency

• Redundancy: Multiple components performing the same function.

• Device redundancy: dual routers, switches.
• Link redundancy: multiple physical paths.
• Power redundancy: dual power supplies and UPS.

• Protocol Redundancy and Fast Convergence

• Routing protocols (OSPF, EIGRP, BGP, IS-IS) tuned for fast failover.
• Use of First Hop Redundancy Protocols (HSRP, VRRP, GLBP) at the access layer.
• MPLS Fast Reroute for service provider networks.

• Load Balancing: Distributing traffic across multiple paths to avoid single points of failure.
• Design for Isolation and...

Produkt-Details

• Erscheint lt. Verlag: 11.6.2025
• Sprache: englisch
• Themenwelt: Sozialwissenschaften ► Pädagogik
• ISBN-13: 9780000972538 / 9780000972538