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Cisco Certified Design Expert (CCDE v3.0) Written certification exam is a comprehensive and challenging exam that is designed to validate the skills and knowledge of network design experts. The CCDE certification is recognized as one of the most prestigious certifications in the networking industry, and it is designed for senior-level network architects, engineers, and designers who are responsible for designing, implementing, and managing large-scale networks. If you are looking to advance your career in network design, the CCDE certification is definitely worth considering.

Cisco 400-007 Exam is part of the Cisco Certified Design Expert (CCDE) certification program. It is a written exam that tests candidates' ability to design and develop complex, converged networks. The CCDE certification is aimed at experienced network architects and designers who are responsible for planning, designing, and implementing enterprise networks. Cisco Certified Design Expert (CCDE v3.0) Written Exam certification demonstrates a high level of expertise in network design and architecture, and is recognized as one of the most prestigious certifications in the networking industry.

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Cisco 400-007 exam is a computer-based test that consists of multiple-choice questions and simulations. 400-007 exam is designed to evaluate the candidate's ability to analyze complex network problems and propose effective solutions. 400-007 exam is timed and candidates are given a specific amount of time to complete each section. 400-007 Exam is rigorous and challenging, and candidates are expected to have a high level of knowledge and experience in network design.

Cisco Certified Design Expert (CCDE v3.0) Written Exam Sample Questions (Q164-Q169):

NEW QUESTION # 164
Which two foundational aspects of IoT are still evolving and being worked on by the industry at large?
(Choose two)

A. Standards
B. Low energy Bluetooth sensors
C. Regulatory domains
D. IoT consortia
E. WiFi protocols

Answer: A,D

Explanation:
The IoT ecosystem continues to evolve around industry-wide agreements on protocols, frameworks, security, interoperability, and standards:
* D: Multiple IoT consortia (such as Industrial Internet Consortium, Open Connectivity Foundation, etc.) are still developing open frameworks and interoperability models.
* E: IoT standards for security, data privacy, management, and protocol interoperability are still maturing as the market rapidly evolves.
Why other options are incorrect:
* A: Wi-Fi protocols (such as 802.11ax) are already mature and standardized for IoT.
* B: Regulatory domains (frequency allocations, power levels) are already well-established.
* C: Low-energy Bluetooth sensors are already standardized and widely implemented.
-

NEW QUESTION # 165
You are tasked to design a QoS policy for a service provider so they can include it in the design of their MPLS core network If the design must support an MPLS network with six classes, and CEs will be managed by the service provider, which QoS policy should be recommended?

A. map DSCP bits into the Exp field
B. map flow-label bits into the Exp field
C. map IP CoS bits into the IP Precedence field
D. map IP precedence bits into the DSCP field

Answer: A

NEW QUESTION # 166
An architect receives a functional requirement for a NAC system from a customer security policy stating that if a corporate Wi-Fi device does not meet current AV definitions, then it cannot access the corporate network until the definitions are updated. Which component should be built into the NAC design?

A. quarantine SGTs
B. quarantine VLAN
C. dACLs with SGTs
D. posture assessment with remediation VLAN

Answer: D

NEW QUESTION # 167
Refer to the exhibit.

Refer to the exhibit. Two data center sites (X and Y) connect to the Internet and each other using a backdoor link. Both advertise the same IP prefix (100.75.10.0/23) to the Internet. Firewalls are behind R1 and R2.
Problem: When users attempt to reach 100.75.10.0/23, the return traffic is routed to Site-Y, regardless of where the session originated. This results in asymmetric traffic and potentially broken sessions due to firewall behavior.
Which design resolves the issue?

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

Answer: D

Explanation:
Comprehensive and Detailed Explanation:
* D: The most effective solution is to have Site-X advertise a more specific (longer) prefix (e.g.,
100.75.10.0/24), which allows external BGP routers to prefer Site-X over Site-Y. This ensures traffic destined for Site-X flows directly to it, preserving symmetry. Additionally, control plane coordination between R1 and R2 ensures proper routing consistency and minimizes the risk of loops or misdirection.
Other options:
* A: Using BGP MED works within the same AS; it is often ignored by external ISPs.
* B: Replicating firewall behavior does not address the routing issue.
* C: DNS manipulation is a workaround-not a scalable or robust design solution.
This solution is consistent with BGP best practices and CCDE v3.1 guidance on traffic engineering and policy- based routing.

NEW QUESTION # 168
Refer to the exhibit.

Company XYZ's BGP topology is as shown in the diagram. The interface on the LA router connected toward the 10.1.5.0/24 network is faulty and is going up and down, which affects the entire routing domain. Which routing technique can be used in the routing policy design so that the rest of the network is not affected by the flapping issue?

A. Use route dampening on LA router for the 10.1.5.0/24 network so that it does not get propagated when it flaps up and down
B. Use route filtering on LA router to block the 10.1.5.0/24 network from getting propagated toward Chicago and New York
C. Use route filtering on Chicago router to block the 10.1.5.0/24 network from coming in from the LA router
D. Use route aggregation on LA router to summarize the 10.1.4.0/24, 10.1.5.0/24, 10.1.6.0/24, and 10.1.7.0
/24 networks toward Chicago

Answer: D

Explanation:
The issue described is classic route flapping, where a single unstable prefix (10.1.5.0/24) causes repeated route withdrawals and advertisements, triggering churn in the BGP control plane across the entire network.
This behavior can be mitigated using the following scalable and non-disruptive design approach:
* D. Route Aggregation: Aggregating routes at the edge router (in this case, the LA router) means that multiple more specific prefixes (such as 10.1.4.0/24 through 10.1.7.0/24) are advertised as a single summarized prefix (e.g., 10.1.4.0/22). As a result, the instability of 10.1.5.0/24 will not affect upstream routers (Chicago and New York), as they will only see the aggregated route.
Key benefits aligned with CCDE v3.1 design guidance:
* Isolates flapping to the edge while maintaining reachability
* Reduces control plane churn in BGP
* Preserves scalability and simplifies the routing table in upstream routers Why other options are incorrect:
* A (Route dampening): While effective, route dampening is less favored today due to convergence delay and side effects; it's also a reactive measure versus a design-based solution.
* B and C (Filtering): Filtering the route prevents reachability to that subnet, which violates availability requirements and causes data black-holing.
Thus, aggregation is the most scalable, nondisruptive, and design-aligned choice in this context.

NEW QUESTION # 169
......

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