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Cisco 400-007 Exam Syllabus Topics:

Section	Weight	Objectives
Network Design	30%	- Design Service Provider and Enterprise WAN architectures 1. Software-Defined WAN design implementations 2. WAN transport technologies including MPLS, Layer 3 VPN, and Metro Ethernet 3. Data center interconnect solutions - Design resilient and scalable campus architectures 1. High availability techniques and fast convergence mechanisms 2. Layer 2 and Layer 3 boundary definitions
Control, Data, Management Plane and Operational Design	25%	- Design data plane transport and management plane strategies 1. Network visibility, telemetry, and logging infrastructures 2. End-to-end Quality of Service policies - Design control plane routing architectures 1. IPv4 and IPv6 dual-stack infrastructure transitions 2. Multicast routing designs and protocol options 3. Unicast routing protocols including OSPF, EIGRP, IS-IS, and BGP
Service Design	15%	- Design infrastructure and network virtualization 1. Cloud integration models including hybrid and multi-cloud environments 2. MPLS architecture implementations such as LDP and Segment Routing - Incorporate automation and network programmability 1. Data parsing structures using JSON and XML formats 2. Infrastructure as Code tool adoption
Security Design	15%	- Design secure perimeter and edge boundaries 1. Enterprise cryptography architectures and VPN frameworks 2. Firewall and Intrusion Prevention System deployment modes - Design secure infrastructure controls 1. Layer 2 and Layer 3 security defense mechanisms 2. Network virtualization security and microsegmentation
Business Strategy Design	15%	- Assess business goals and drivers 1. Evaluate risk management and business continuity strategies 2. Analyze company financial metrics and drivers like CAPEX, OPEX, and ROI 3. Determine regulatory and compliance constraints - Evaluate project management methodologies impact 1. Agile framework and iterative lifecycle alignment 2. Waterfall framework implementation constraints

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Cisco Certified Design Expert (CCDE) Written Exam Sample Questions (Q391-Q396):

NEW QUESTION # 391
A BGP route reflector in the network is taking longer than expected to converge 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. Increase the size of the large buffers.
B. Decrease the size of the small buffers.
C. Increase the size of the hold queue.
D. Increase the keepalive timers for each BGP neighbor.

Answer: C

Explanation:
During massive BGP update events (such as after a topology change), a route reflector may struggle processing both BGP updates and the resulting TCP acknowledgments required for reliable BGP session communication.
Increasing the hold queue size allows the router to buffer more packets waiting for processing (including TCP acknowledgments), helping the router handle bursts of BGP updates without dropping TCP segments or tearing down sessions.
This queue tuning is a well-known scalability optimization in CCDE v3.1 when designing route reflector clusters handling large-scale control plane updates.
Why other options are incorrect:
B and C: Adjusting buffer sizes does not directly address TCP acknowledgment backlog.
D: Keepalive timers control session liveliness, not update processing.
-

NEW QUESTION # 392
Refer to the exhibit.

An engineer is designing the traffic flow for AS 111. Traffic from AS 111 should be preferred via AS 100 for all external routes. A method must be used that only affects AS 111. Which BGP attributes are best suited to control outbound traffic?

A. community
B. local preference
C. As path
D. MED

Answer: B

NEW QUESTION # 393
Which development model is closely associated with traditional project management?

A. static model
B. lifecycle model
C. evolutionary delivery model
D. Agile model

Answer: C

NEW QUESTION # 394
A business customer deploys workloads in the public cloud. Now the customer network faces governance issues with the flow of IT traffic and must ensure the security of data and intellectual property. Which action helps to identify the issue for further resolution?

A. Send IPFIX telemetry data from customer routers to a centralized collector to identify traffic to cloud service providers
B. Build a zone-based firewall policy on Internet edge firewalls that collects statistics on traffic sent to cloud service providers
C. Apply workload policies that dictate the security requirements to the workloads that are placed in the cloud.
D. Set up a secure tunnel from customer routers to ensure that traffic is protected as it travels to the cloud service providers.

Answer: A

NEW QUESTION # 395
Refer to the exhibit.

An engineer has been asked to redesign the traffic flow toward AS 111 coming from AS 500.Traffic destined to AS 111 network 91 7 0.0/16 should come in via AS 100. while traffic destined to all other networks in AS 111 should continue to use the existing path Which BGP attributes are best suited to control this inbound traffic coming from BGP AS 500 Into the 91.7.0.0/16 network?

A. Use local preference on R1 for the networks that AS 500 advertises to AS 111.
B. Use extended community for the 91.7.0.0/16 network, not advertising it to the bi-lateral peer.
C. Set higher MED for neighbor in AS 100 to influence incoming traffic for the 91. 7.0.0/16 network.
D. Prepend AS path for the 91.7.0.0/16 network and set it for neighbor in AS 200.

Answer: D

NEW QUESTION # 396
......

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