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Cisco 400-007 Exam Syllabus Topics:

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

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Cisco Certified Design Expert (CCDE) Written Exam Sample Questions (Q126-Q131):

NEW QUESTION # 126
Company XYZ is in the process of identifying which transport mechanism(s) to use as their WAN technology. Their main two requirements are:
* A technology that could offer DPI, SLA, secure tunnels, privacy, QoS, scalability, reliability, and ease of management.
* A technology that is cost-effective.
Which WAN technology(ies) should be included in the design of company XYZ?

A. Internet should be the preferred option because it is cost-effective and supports BFD, IP SLA, and IPsec for secure transport over the public Internet.
B. Software-defined WAN should be the preferred choice because it complements both technologies, covers all the required features, and it is the most cost-effective solution.
C. Both technologies should be used. Each should be used to back up the other one; where the primary links are MPLS, the Internet should be used as a backup link with IPsec (and vice versa).
D. MPLS meets all these requirements and it is more reliable than using the Internet. It is widely used with defined best practices and an industry standard.

Answer: B

Explanation:
* SD-WAN integrates multiple underlay transport options (Internet, MPLS, LTE) while delivering advanced features like DPI (Deep Packet Inspection), SLA monitoring, QoS, encryption, scalability, and centralized management.
* It provides policy-based path selection, cost optimization, and rapid deployment.
* SD-WAN is widely regarded as a modern WAN design solution fully aligned with CCDE v3.1 design principles for cost-effective and flexible WAN architectures.
Why other options are incorrect:
* B: Internet alone cannot deliver consistent SLA or QoS guarantees.
* C: Hybrid MPLS + Internet may work but is more complex and costly; SD-WAN natively supports such hybrid models.
* D: MPLS offers SLAs but lacks flexibility, DPI, and cost-effectiveness compared to SD-WAN.
-

NEW QUESTION # 127
Sometimes SDN leverages various overlay networking technologies to create layer(s) of network abstraction.
What describes an overlay network?

A. It encapsulates packets at source and destination, which incurs additional overhead
B. It transmits packets that traverse over network devices like switches and routers
C. It is responsible for the delivery of packets; NAT- or VRF-based segregation is required
D. Packet delivery and reliability occurs at Layer 3 and Layer 4

Answer: A

Explanation:
B (Encapsulation at source and destination):Overlay networks encapsulate payloads inside another protocol (e.
g. VXLAN, GRE, MPLS), adding headers that enable separation from the underlay network while introducing minor overhead due to encapsulation.
Other options explained:
A: Describes underlay behavior.
C: Overlay encapsulation occurs independently of L3/L4 reliability.
D: NAT or VRF are isolation mechanisms but not how overlays function.

NEW QUESTION # 128
Drag and Drop Question
Drag and drop the multicast protocols from the left onto the current design situation on the right.

Answer:

Explanation:

NEW QUESTION # 129
Refer to the exhibit. The network 10.10.0.0/16 has been redistributed to OSPF processes and the best path to the destination from R1 has been chosen as R1-R2-R3. A failure occurred on the link between R2 and R3, and the path was changed to R1-R4-R5-R3 What happens when the link between R2 and R3 is restored?

A. The path R1-R4-R5-R3 continues to be the best path because the metric is better.
B. The path reverts to R1-R2-R3 because this was the previous best path.
C. The path reverts back to R1-R2-R3 because the route type is E1.
D. The path R1-R4-R5-R3 continues to be the best path because OSPF does not compare the metrics between two domains.

Answer: B

NEW QUESTION # 130
Refer to the exhibit.

An engineer is designing the network for a multihomed customer running in AS 111 does not have any other Ass connected to it. Which technology is more comprehensive to use in the design to make sure that the AS is not being used as a transit AS?

A. Include a prefix list to only receive routes from neighboring ASs.
B. Configure the AS-set attribute to allow only routes from AS 111 to be propagated to the neighbor ASs.
C. include an AS path access list to send routes to the neighboring ASs that only have AS 111 in the AS path field.
D. Use the local preference attribute to configure your AS as a non-transit'' AS.

Answer: C

NEW QUESTION # 131
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