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Cisco 400-007 Exam Syllabus Topics:

Section	Weight	Objectives
Network Design	30%	- Design resilient and scalable campus architectures 1. High availability techniques and fast convergence mechanisms 2. Layer 2 and Layer 3 boundary definitions - 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
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. 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
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. Enterprise cryptography architectures and VPN frameworks 2. Firewall and Intrusion Prevention System deployment modes
Business Strategy Design	15%	- Evaluate project management methodologies impact 1. Agile framework and iterative lifecycle alignment 2. Waterfall framework implementation constraints - Assess business goals and drivers 1. Analyze company financial metrics and drivers like CAPEX, OPEX, and ROI 2. Determine regulatory and compliance constraints 3. Evaluate risk management and business continuity strategies
Service Design	15%	- Design infrastructure and network virtualization 1. MPLS architecture implementations such as LDP and Segment Routing 2. Cloud integration models including hybrid and multi-cloud environments - Incorporate automation and network programmability 1. Infrastructure as Code tool adoption 2. Data parsing structures using JSON and XML formats

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Cisco Certified Design Expert (CCDE) Written Exam Sample Questions (Q352-Q357):

NEW QUESTION # 352
Company XYZ is redesigning their QoS policy. Some of the applications used by the company are real-time applications. The QoS design must give these applications preference in terms of transmission. Which QoS strategy can be used to fulfill the requirement?

A. first-in first-out
B. weighted random early detection
C. low-latency queuing
D. weighted fair queuing

Answer: C

Explanation:
* Low-Latency Queuing (LLQ) offers strict priority queuing to real-time traffic (voice/video), ensuring minimal delay, jitter, and packet loss.
* This satisfies real-time application requirements which are extremely sensitive to delay variation.
Why other options are incorrect:
* A: WFQ offers fairness but no strict prioritization.
* B: WRED avoids congestion but is not suited for real-time traffic.
* D: FIFO provides no QoS differentiation.
-

NEW QUESTION # 353
Which two features are advantages of SD-WAN compared to MPLS-based connectivity? (Choose two.)

A. Unifies the WAN backbone
B. Manages failures through backup links
C. Uses policy-based forwarding of real-time traffic with less complexity
D. Separates infrastructure and policy
E. Uses FEC constructs for traffic forwarding, thereby improving efficiency

Answer: C,D

Explanation:
* B (Separation of infrastructure and policy):SD-WAN decouples policy control from the underlying transport.
* C (Simpler policy-based forwarding):Centralized controllers dynamically steer traffic according to application policies with less complexity than traditional QoS in MPLS.
Other options explained:
* A: FEC (Forward Error Correction) is typically not used in standard SD-WAN implementations.
* D: SD-WAN does not unify WAN backbones; it abstracts multiple underlays.
* E: Both MPLS and SD-WAN have failure management, but SD-WAN focuses more on dynamic path control than simply backup links.

NEW QUESTION # 354
Refer to the exhibit.

As part of a redesign project, you must predict multicast behavior. What happens to the multicast traffic received on the shared tree (*,G), if it is received on the LHR interface indicated?

A. It is dropped due to an unsuccessful RPF check against the multicast source
B. It is switched due to a successful RPF check against the routing table
C. It is dropped due to an unsuccessful RPF check against the multicast receiver.
D. It is switched given that no RPF check is performed

Answer: B

Explanation:
In PIM Sparse Mode, when the Last-Hop Router (LHR) receives multicast traffic on the shared tree (*,G), it performs an RPF check based on the RP address, not the multicast source address. In the diagram:
* The LHR has IGP cost 10 towards the RP.
* The shared tree (*,G) uses RP as the RPF target.
* Since multicast traffic on (*,G) arrives on the interface toward RP (correct RPF interface), the RPF check succeeds.
Therefore, the multicast traffic is successfully switched toward the receivers.
This behavior is fully aligned with CCDE v3.1 multicast design principles, which emphasize clear understanding of RPF behavior both on shared trees (*,G) and source trees (S,G).
Why other options are incorrect:
* A: The RPF check is not performed against the source in (*,G); it uses RP.
* B: RPF checks are always performed, even on (*,G).
* D: RPF is unrelated to the receiver address.

NEW QUESTION # 355
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 an AS path access list to send routes to the neighboring ASs that only have AS 111 in the AS path field.
B. Include a prefix list to only receive routes from neighboring ASs.
C. Use the local preference attribute to configure your AS as a "non-transit'' AS.
D. Configure the AS-set attribute to allow only routes from AS 111 to be propagated to the neighbor ASs.

Answer: A

Explanation:
Using an AS path access list helps ensure that only routes originating from the customer AS (AS
111) are advertised to another ASs. By filtering routes with an empty AS path field, AS 111 can prevent being used as a transit AS by disallowing routes coming from another ASs. This is a more comprehensive approach compared to other methods in the options provided.

NEW QUESTION # 356
Two routers (R1 and R2) run OSPF and have registered with BFD in asynchronous mode with the echo function enabled. Which two actions occur with the echo function? (Choose two)

A. BFD sessions at either end actively participate in the forwarding of echo packets
B. BFD control packets are sent at a slower pace because the echo function is enabled
C. Only BFD control packets are sent from forwarding engines along the Layer 2 path to perform detection
D. BFD echo packets are sent from forwarding engines along the Layer 2 path to perform detection
E. BFD control packets are sent at a higher pace because the echo function is enabled

Answer: A,D

Explanation:
# Explanation:
* B: BFD echo packets are looped back by the peer and sent through the data plane (forwarding engine) over the actual Layer 2 path. This ensures the link is not only up logically but physically functional.
* E: Both ends of the BFD session (R1 and R2) participate in sending/receiving and forwarding echo packets, validating bidirectional liveliness.
Other options:
* A: Echo packets are independent of control packets. Echo may offload failure detection to data plane but does not reduce control packet frequency.
* C: Control packet rate is not increased by echo function.
* D: Both control and echo packets play roles; it's not "only control packets" or "only echo packets" used in detection.

NEW QUESTION # 357
......

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