400-007 Exam Dumps - Cisco Certified Design Expert (CCDE v3.1)

A: On most hardware platforms, control plane protection is implemented in hardware to safeguard CPU resources from overload due to excessive control traffic.

E: Control plane policing must be carefully sized to allow sufficient protocol traffic (OSPF, BGP, etc.) during normal and convergence periods to ensure stability.

Why other options are incorrect:

B: Policing should be applied universally, not just on external interfaces.

C: False alarms are operational issues but not design considerations.

D: Control plane policers are applied after forwarding decisions for traffic destined to the router CPU.

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In modern network architectures, particularly those using NFV (Network Function Virtualization),Service Chainingis used to direct traffic through a sequence of virtualized network functions (VNFs)—such as firewalls, load balancers, NAT devices, etc.—based on service requirements.

Service chaining allows:

Dynamic or policy-based redirection of traffic through VNFs

Simplified orchestration of network services

Scalability and flexibility across multi-tenant or virtualized environments

CCDE v3.1 emphasizes service chaining as a key enabler in cloud-native and virtualized architectures, ensuring services are efficiently composed based on application or security needs.

Why other options are incorrect:

A and E (Bridging/Switching): Refer to traditional Layer 2 forwarding and do not provide VNF sequencing logic.

C and D: “Linking” and “Daisy chaining” are not standard or scalable methods in NFV environments.

The hierarchical model provides:

A: Fault isolation by limiting failures to specific layers.

D: Modularity and flexibility, making it easier to implement changes without affecting the entire network.

Why other options are incorrect:

B: Design typically starts at the access layer upwards.

C: Server access is handled at the distribution or access layer, not the core.

E: Security is handled at access/distribution layers, not primarily at core layer.

Ansible is an open-source automation tool that enables configuration management, application deployment, cloud provisioning, and orchestration.

It uses simple YAML-based playbooks and SSH-based connectivity, making it agentless, highly scalable, and easy to integrate with networking environments.

Commonly adopted in network automation, cloud infrastructure provisioning, and service orchestration as part of modern network design practices covered under CCDE v3.1.

Why other options are incorrect:

B (Contrail): Network virtualization platform, not primarily an automation tool.

C (Java): General-purpose programming language, not specifically designed for infrastructure automation.

D (Jinja2): Templating engine, used inside Ansible but not an automation tool by itself.

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Comprehensive and Detailed Explanation:

CAPEX (Capital Expenditures) focuses on up-front hardware investments, like routers, switches, and appliances.

A: Scalability directly impacts CAPEX—network designs that require fewer or more scalable hardware components reduce capital investment costs.

B and D are more influenced by OPEX (operational expenditures).

C (complexity) is a broader design challenge, not directly tied to CAPEX.

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B (Install firewalls):PCI DSS requires network segmentation, filtering, and perimeter defense via firewalls.

C (Use antivirus software):Malware protection and anti-virus software are mandatory on all systems interacting with cardholder data.

Other options explained:

A/D/E: These are general security best practices but not specific mandatory requirements under PCI DSS control objectives.

In addition to business requirements, network architects must also account for non-business constraints such as legal, regulatory, and industry compliance. These may include standards like GDPR, HIPAA, PCI-DSS, or country-specific data sovereignty and retention laws.

Compliance is not typically driven by direct business value but by external mandates that influence how the network must be designed, implemented, and operated. Ignoring compliance requirements can result in significant legal or financial penalties and is therefore a core component of any responsible network design.

Other options such as:

A. Location — may impact design (e.g., latency, availability), but it is often categorized as a technical or logistical consideration.

B. Cost — is a business constraint.

C. Time — is considered a project or delivery constraint, also typically business-driven.