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Cisco 400-007 Exam Syllabus Topics:

Section	Weight	Objectives
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. Multicast routing designs and protocol options 2. IPv4 and IPv6 dual-stack infrastructure transitions 3. Unicast routing protocols including OSPF, EIGRP, IS-IS, and BGP
Security Design	15%	- Design secure perimeter and edge boundaries 1. Firewall and Intrusion Prevention System deployment modes 2. Enterprise cryptography architectures and VPN frameworks - Design secure infrastructure controls 1. Layer 2 and Layer 3 security defense mechanisms 2. Network virtualization security and microsegmentation
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
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. Layer 2 and Layer 3 boundary definitions 2. High availability techniques and fast convergence mechanisms
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. Waterfall framework implementation constraints 2. Agile framework and iterative lifecycle alignment

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400-007考古題分享 - 400-007證照考試

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最新的 CCDE v3.0 400-007 免費考試真題 (Q546-Q551):

問題 #546
Refer to the diagram.

Which solution must be used to send traffic from the foreign wireless LAN controller to the anchor wireless LAN controller?

A. Encapsulate packets into an EoIP tunnel and send them to the anchor controller.
B. Send packets from the foreign controller to the anchor controller via Layer 3 MPLS VPN or VRF-Lite
C. Send packets without encapsulation to the anchor controller over the routed network.
D. Send packets from the foreign controller to the anchor controller via IPinIP or IPsec tunnel.

答案：A

問題 #547
Customer XYZ network consists of an MPLS core, IS-IS running as IGP, a pair of BGP route reflectors for route propagation, and a few dozen MPLS-TE tunnels for specific tactical traffic engineering requirements.
The customer's engineering department has some questions about the use of the Overload Bit in the IS-IS networks and how it could be used to improve their current network design. Which two concepts about the Overload Bit are true? (Choose two.)

A. It is not recommended on BGP Route Reflectors
B. It forces the midpoint MPLS-TE node to reoptimize the primary tunnels going through the OL node.
C. Networks advertised within the LSPs of the respective node will become unreachable
D. It can be set on a router until other interacting protocols have signaled convergence.
E. It can be set on a router during the startup process for a fixed period of time

答案：D,E

解題說明：
The IS-IS Overload Bit allows a router to signal to its peers that it should be temporarily excluded from SPF calculations for transit traffic:
* A: The Overload Bit can be automatically set at startup (known as "startup overload") to allow the router sufficient time to converge IGP, BGP, and stabilize protocols before accepting transit traffic.
* D: The bit can remain set until all dependent protocols have converged and the router is fully operational.
Why other options are incorrect:
* B: The router's directly connected prefixes remain reachable; only transit path calculations exclude the overloaded node.
* C: MPLS-TE does not automatically reoptimize tunnels based on the Overload Bit.
* E: There is no specific restriction preventing Overload Bit usage on Route Reflectors.

問題 #548
SDN emerged as a technology trend that attracted many industries to move from traditional networks to SDN. Which challenge is solved by SDN for cloud service providers?

A. complex and distributed management flow
B. need for intelligent traffic monitoring
C. higher operating expense and capital expenditure
D. exponential growth of resource-intensive application

答案：D

問題 #549
SDWAN networks capitalize the usage of broadband Internet links over traditional MPLS links to offer more cost benefits to enterprise customers. However, due to the insecure nature of the public Internet, it is mandatory to use encryption of traffic between any two SDWAN edge devices installed behind NAT gateways. Which overlay method can provide optimal transport over unreliable underlay networks that are behind NAT gateways?

A. GRE
B. IPsec
C. TLS
D. DTLS

答案：D

解題說明：
DTLS (Datagram Transport Layer Security) is the most optimized overlay protocol for SDWAN deployments over public internet, especially when NAT traversal is required.
It combines security similar to TLS while using UDP, which handles packet loss, jitter, and reordering better than TCP-based TLS.
DTLS is natively supported in most SDWAN solutions for encrypted transport across NAT environments without complex configurations.
It allows optimal performance on unreliable or high-latency networks while maintaining strong security standards.
Why other options are incorrect:
A (TLS): Uses TCP, less suited for networks with packet loss or reordering.
C (IPsec): Requires additional NAT traversal mechanisms like NAT-T and may not handle unreliable underlay as effectively as DTLS.
D (GRE): Tunneling protocol without native encryption.

問題 #550
When organizations initially start consuming public cloud services, they often use VPNs over the internet to connect their on-premises applications to the public cloud infrastucture. In which two cases are other connectivitods a better fits? (Choose two)

A. Latency sensitive multimedia streaming
B. high availability
C. migration to transit gateway
D. cost sensitive business applications
E. desktop-as-a-service using VDI

答案：A,E

解題說明：
Latency sensitive multimedia streaming requires low and consistent latency as well as high bandwidth to deliver smooth, high-quality streams. VPNs over the public internet often suffer from variable latency and packet loss, making private or dedicated connections (like Direct Connect, ExpressRoute, or Software-Defined Cloud Interconnection) more suitable.
Desktop-as-a-service (DaaS) using Virtual Desktop Infrastructure (VDI) also demands low latency and high reliability to provide a responsive user experience. VPNs over the internet can introduce jitter and delays that degrade the performance of remote desktops, so private or dedicated cloud connectivity options are preferred

問題 #551
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