400-007 Exam Questions & Answers
Cisco Certified Design Expert CCDE v3.1 • Cisco
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Sample 400-007 Questions
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You are designing the routing design for two merging companies that have overlapping IP address space. Which of these must you consider when developing the routing and NAT design?
In most Cisco NAT implementations:
Local-to-global NAT translations occur before policy-based routing (PBR), meaning that NAT happens first, and then PBR decisions are made based on the translated addresses.
This sequence is important when designing overlapping address spaces, as NAT must be applied before routing policies can correctly forward traffic based on global addresses.
Other options explained:
A: Incorrect sequence.
B/D: Global-to-local translations occur during inbound processing but not in the order described relative to PBR.
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Which solution component helps to achieve comprehensive threat protection and compliance for migration to multicloud SDX architectures?
D (SASE - Secure Access Service Edge):SASE integrates networking and security functions (e.g., SD-WAN, firewall, CASB, ZTNA) into a single cloud-native service model, designed specifically for multicloud and distributed environments.
Other options explained:
A/B/C: These do not represent industry-standard security frameworks like SASE.
Company XYZ is migrating their existing network to IPv6. Some access layer switches do not support IPv6, while core and distribution switches fully support unicast and multicast routing. The company wants to minimize cost of the migration. Which migration strategy should be used?
C (Layer 2 switches unaffected):IPv6 operates at Layer 3, so pure Layer 2 switches forward frames without needing IPv6 awareness. As long as switches can transparently forward Ethernet frames, IPv6 functionality will be preserved, minimizing unnecessary hardware upgrades.
Other options explained:
A/B/D: These unnecessarily increase cost and complexity for basic Layer 2 functionality where IPv6 awareness is not mandatory.
What is a disadvantage of the traditional three-tier architecture model when east-west traffic between different pods must go through the distribution and core layers?
D: Traditional three-tier architectures (access, distribution, and core layers) require that east-west traffic (between servers or pods in different access layers) traverse up to the distribution or core and then back down---introducing unnecessary hops and latency. This is a key design limitation addressed by spine-leaf and fabric architectures.
Other options:
A: Bandwidth may be sufficient but not optimally utilized due to suboptimal pathing.
B: Security is not inherently compromised by architecture, although microsegmentation is harder.
C: Three-tier architectures can scale, but less efficiently and not without trade-offs like latency and complexity.
A network hacker introduces a packet with duplicate sequence numbers to disrupt an IPsec session. During this, high-priority traffic is transmitted. What design parameter helps mitigate this?
Comprehensive and Detailed
B: The IPsec anti-replay mechanism protects against packet injection and replay attacks by rejecting packets outside the anti-replay window. Increasing the anti-replay window (e.g., to 4096) allows legitimate packets with slightly reordered or delayed sequence numbers to be accepted---especially critical during bursts or with asymmetric paths.
Other options:
A: QoS marking does not prevent replay.
C: Tunnel keyword restrictions don't address replay attacks.
D: Shaping affects traffic rate, not sequence validation.
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