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400-007Updated 1d ago · Sep 4, 2026

400-007: Cisco Certified Design Expert

349 questions across 1 topics, with suggested answers, explanations where available, and imported community discussion. The first 34 questions are free to preview.

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Question 1 · Network Design Open

Which two attributes are associated with 802.1s? (Choose two.)

Answer: A, D IEEE 802.1s Multiple Spanning Tree Protocol uses the rapid-convergence behavior of IEEE 802.1w and lets several VLANs be assigned to the same spanning-tree instance. This reduces the number of spanning-tree calculations and associated resource use compared with maintaining an instance per VLAN. **Learn more:** [Understand the Multiple Spanning Tree Protocol (802.1s)](https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24248-147.html) · [IEEE 802.1s - Multiple Spanning Trees](https://www.ieee802.org/1/pages/802.1s.html)
Question 2 · Security Design Open

When classifying and marking traffic, a recommended design principle is to classify and mark applications as near to their sources as technically and administratively feasible. As the boundary between enterprises and service providers continues to blur, what provides interoperability and enables future expansion?

Answer: C Standards-based Differentiated Services Code Point (DSCP) per-hop behavior (PHB) markings provide a common QoS classification language across administrative domains, allowing traffic to receive consistent treatment and supporting scalable expansion. **Learn more:** [RFC 2474: Differentiated Services Field Definition](https://www.rfc-editor.org/rfc/rfc2474.html) · [Cisco: Implement QoS Policies with DSCP](https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-packet-marking/10103-dscpvalues.html)
Question 3 · Network Design Open

With reference to the exhibit, Company XYZ is a large enterprise network in which WAN traffic uses most of the link capacity. The company's IT team frequently reports Stuck-In-Active problems. The company plans to acquire another company that will also run EIGRP and connect to the Company XYZ R3 and R4 routers. This acquisition could worsen the issue. Which design solution resolves this problem?

Question exhibit
Answer: D EIGRP stub routing on edge routers limits the EIGRP query domain, so upstream routers do not query R5 and R6 for routes that those routers cannot provide. Advertising only connected and summary routes preserves advertisement of the edge routers’ local routes while preventing them from being transit points and reducing query-related congestion that can cause stuck-in-active conditions. **Learn more:** [EIGRP Stub Router Functionality](https://www.cisco.com/en/US/technologies/tk648/tk365/technologies_white_paper0900aecd8023df6f.html) · [IP Routing Configuration Guide — EIGRP Stub Routing](https://www.cisco.com/c/en/us/td/docs/routers/ios-xe/ip-routing/b-ip-routing/m_ire-eigrp-stub-rtg.html)