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Cisco 400-007 Exam Syllabus Topics:

Section	Objectives
Topic 1: Infrastructure Design (Layer 2 / Layer 3)	- Layer 3 design 1. IGP selection and design 2. IP addressing and summarization - Layer 2 technologies 1. Ethernet scaling and segmentation 2. Spanning Tree design considerations
Topic 2: MPLS and VPN Architectures	- MPLS fundamentals 1. MPLS scalability design 2. Label switching architecture - VPN design 1. L3VPN and L2VPN design models 2. Multi-site connectivity strategies
Topic 3: Network Design Methodology and Principles	- Design lifecycle and methodology 1. Trade-off analysis techniques 2. Design phases and validation approaches - Requirements gathering and analysis 1. Stakeholder requirements mapping 2. Business and technical constraints
Topic 4: Routing and Path Control	- Traffic engineering 1. Policy-based routing considerations 2. Path optimization techniques - Routing protocol design 1. BGP policy and scalability 2. OSPF / IS-IS architecture
Topic 5: End-to-End Enterprise Architecture Scenarios	- Large-scale enterprise design 1. High availability and redundancy 2. Scalability and resiliency trade-offs - Service integration 1. Hybrid connectivity design 2. Migration and transformation strategies
Topic 6: Multicast and Advanced Services	- Multicast design 1. PIM architecture and scaling 2. Multicast distribution models - Network services 1. QoS design principles 2. Security integration in design

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Cisco Certified Design Expert (CCDE) Written Exam Sample Questions (Q361-Q366):

NEW QUESTION # 361
Virtualization pose a special challenges for NAC because virtual servers can move around a data center, and the VLAN can change as the servers move. What is an option that can be used to improve security in this condition?

A. application-based security
B. role-based control
C. in-band traffic control
D. application-based security

Answer: B

NEW QUESTION # 362
Organic growth or decline comes from a company's normal business activities, rather than through acquisitions or divestment. Changes in usage patterns can also cause organic change in network requirements Which tool is useful when designing and operationalizing a network that is in the process of change?

A. mobility
B. monitoring
C. modularity
D. change management

Answer: D

NEW QUESTION # 363
You want to add 900 VLANs to an existing 90 in a data center. What are two spanning tree concerns to consider?

A. The PVST+ increases CPU utilization
B. The diameter of the STP topology is increased
C. STP is increased by a factor of 10 convergence time
D. BPDU does not support 990 VLANs
E. To add 990 VLANs to the switching hardware, reserved VLANs require using extended VLAN

Answer: A,E

Explanation:
# Explanation:
B: Cisco switches reserve certain VLAN IDs. VLANs beyond 1005 are considered extended VLANs and may require special configuration (e.g., VTP transparent mode).
D: Each VLAN with PVST+ has its own instance of STP. Adding 900 more VLANs significantly increases the STP processing overhead on the switch's control plane and CPU.
Other options:
A: STP convergence time is more dependent on topology than VLAN count.
C: STP diameter is unrelated to the number of VLANs-it ' s a function of hops in the topology.
E: BPDU handling is VLAN-aware under PVST+; there's no direct per-BPDU VLAN limitation.
#

NEW QUESTION # 364
VPLS is implemented in a Layer 2 network with 2000 VLANs. What is the primary concern to ensure successful deployment of VPLS?

A. VLAN scalability
B. PE scalability
C. The underlying transport mechanism
D. Flooding is necessary to propagate MAC address reachability information

Answer: B

Explanation:
Virtual Private LAN Service (VPLS) provides Layer 2 VPN connectivity over MPLS. Each Provider Edge (PE) device must learn and maintain MAC addresses per virtual instance.
* PE Scalability is the primary concern: With 2000 VLANs, each PE participating in those instances must maintain a large forwarding table and handle associated control-plane activity.
* MAC learning and aging, along with full-mesh label-switched paths (LSPs), place a heavy burden on CPU and memory.
* Flooding (A) is expected but not the primary concern; it's a symptom of scale.
* The underlying transport (C) and VLAN ID limits (D) are important but not as critical in the context of PE resource scalability.

NEW QUESTION # 365
Which methodology is the leading lifecycle approach to network design and implementation?

A. Spiral model
B. Waterfall model
C. PPDIOO
D. V model

Answer: C

NEW QUESTION # 366
......

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