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Cisco 400-007 Exam Syllabus Topics:

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

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Cisco Certified Design Expert (CCDE) Written Exam Sample Questions (Q328-Q333):

NEW QUESTION # 328
Refer to the exhibit. Two data center sites, X and Y, are connected with a direct backdoor link under these conditions:
- Site-specific firewalls are deployed behind the Internet edge routers R1 and R2.
- Both sites are advertising the address pool 100.75.10.0/23 toward the Internet.
Site-X finds that Internet traffic returning from user PCs comes back on the Site-Y link. Which design resolves the issue?

A. Add a static route toward the Internet on Site-X.
Change the DNS policy on Site-Y to block traffic.
B. Use BGP MED to influence Site-X return traffic.
Change the IP address scheme of both sites.
C. Change the Site-Y firewall configuration to replicate the Site-X configuration.
Advertise the low MED attribute on Site-X to the Internet.
D. Establish control plane peering between edge routers.
Have Site-X advertise an IP pool with a longer prefix.

Answer: D

NEW QUESTION # 329
Drag and drop the multicast protocols from the left onto the current design situation on the right.

Answer:

Explanation:

NEW QUESTION # 330
Which undesired effect of increasing the jitter compensation buffer is true?

A. The overall transport jitter decreases and quality improves.
B. The overall transport jitter increases and quality issues can occur.
C. The overall transport delay decreases and quality improves.
D. The overall transport delay increases and quality issues can occur.

Answer: D

Explanation:
* Increasing jitter buffer size smoothens jitter but at the cost of introducing additional delay.
* Excessive jitter buffering can lead to perceptible audio or video lag, impacting user experience.
* C: Therefore, the undesired effect is increased transport delay, potentially leading to quality issues if the buffer size is too large.
Why other options are incorrect:
* A & D: Jitter buffering does not improve jitter itself; it masks it at the expense of delay.
* B: Jitter compensation doesn't increase jitter, but delay.
-

NEW QUESTION # 331
Which two statements describe the usage of the IS-IS overload bit technique? (Choose two)

A. It can be used to automatically synchronize the link-state database between Level 1 intermediate systems
B. It can be set in intermediate systems (IS-IS routers) to avoid traffic black holes until routing protocols are fully converged after a reload operation.
C. It can be set in intermediate systems (IS-IS routers) to prioritize control plane CSNP packets.
D. lf overload-bit is set on a Level 2 intermediate system, the other Level 2 intermediate systems in the topology will stop using the overloaded IS to forward Level 2 traffic However, the intermediate system can still forward Level 1 traffic
E. It can be set in intermediate systems (IS-IS routers) to attract transit traffic from other intermediate systems

Answer: B,E

NEW QUESTION # 332
A BGP route reflector in the network is taking longer than expected to coverage during large network changes.
Troubleshooting shows that the router cannot handle all the TCP acknowledgements during route updates.
Which action can be performed to tune the device performance?

A. Decrease the size of the small buffers.
B. Increase the size of the large buffers.
C. Increase the size of the hold queue.
D. Increase the keepalive timers for each BGP neighbor.

Answer: C

NEW QUESTION # 333
......

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