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The CCDE certification exam is a comprehensive, two-part exam that tests the candidate's knowledge and skills in network design. The first part of the exam is a written exam, which consists of multiple-choice and scenario-based questions. The second part of the exam is a practical exam, which is a hands-on lab-based exam that tests the candidate's ability to design and implement complex network solutions.
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NEW QUESTION # 189
Which effect of using ingress filtering to prevent spoofed addresses on a network design is true?
Answer: A
Explanation:
Ingress filtering (also known as uRPF or source address verification) prevents packets with spoofed source addresses from entering the network. By validating that incoming packets have legitimate source addresses (based on routing tables or prefix lists), ingress filtering directly blocks many spoofed DDoS attacks, which often rely on forged source IP addresses.
This principle is foundational in network security design per CCDE v3.1:
* Stops source-spoofed attacks before they enter.
* Protects critical infrastructure from volumetric and reflection/amplification attacks.
* Forms part of secure edge design best practices.
Why other options are incorrect:
* A: DSCP remarking relates to traffic classification, not spoof prevention.
* C: Bogon classification isn't the main function of ingress filtering.
* D: RFC 1918 filtering is a special policy but not the core function of ingress filtering.
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NEW QUESTION # 190
Drag and drop the design use cases from the left onto the correct uRPF techniques used to prevent spoofing attacks Not all options are used.
Answer:
Explanation:
Explanation:
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NEW QUESTION # 191
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*?
Answer: A
Explanation:
https://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/16450-mcastguide0.html
When a multicast packet arrives on an interface, the RPF process checks to ensure that this incoming interface is the outgoing interface used by unicast routing in order to reach the source of the multicast packet. This RPF check process prevents loops. Multicast routing does not forward a packet unless the source of the packet passes a RPF check. Once a packet passes this RPF check, multicast routing forwards the packet based only upon the destination address.
NEW QUESTION # 192
Company XYZ wants to redesign the Layer 2 part of their network and wants to use all available uplinks for increased performance. They also want to have end host reachability supporting conversational learning. However, due to design constraints, they cannot implement port-channel on the uplinks. Which other technique can be used to make sure the uplinks are in active/active state?
Answer: D
NEW QUESTION # 193
Which option is a fate-sharing characteristic in regards to network design?
Answer: B
Explanation:
Fate-sharing describes a situation where two or more services or components are tied together such that failure in one leads to failure in others. In resilient design, the goal is often to eliminate fate-sharing by decoupling dependencies.
* A: A single point of failure (like a shared power supply or converged service path) that brings down multiple components exemplifies fate-sharing.
* B is incorrect because fate-sharing is a risk, not a protective measure.
* C and D refer to device behavior (stateful inspection, transport layer behavior) rather than architectural dependency.
NEW QUESTION # 194
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