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350-401Updated 8d ago · Aug 28, 2026

Implementing Cisco Enterprise Network Core Technologies (ENCOR)

905 questions across 1 topics, with suggested answers, explanations where available, and imported community discussion. The first 90 questions are free to preview.

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Question 1 · Network Assurance Open

Drag and drop the characteristics on the left to the QoS components they describe on the right. <DragDrop items={["applied on traffic to convey information to a downstream device","distinguishes traffic types","process used to buffer traffic that exceeds a predefined rate","permits traffic to pass through the device while retaining DSCP/CoS values"]} slots={[{"answer":"process used to buffer traffic that exceeds a predefined rate","id":"shaping","label":"shaping"},{"answer":"applied on traffic to convey information to a downstream device","id":"marking","label":"marking"},{"answer":"permits traffic to pass through the device while retaining DSCP/CoS values","id":"trust","label":"trust"},{"answer":"distinguishes traffic types","id":"classification","label":"classification"}]} explanation={"QoS classification distinguishes traffic types, marking communicates handling information to downstream devices, shaping buffers excess traffic to enforce a configured rate, and trust preserves received DSCP/CoS values.\n\n**Learn more:** [QoS Policing and Shaping Overview (Cisco IOS XE)](https://www.cisco.com/c/en/us/td/docs/routers/ios/config/17-x/qos/b-quality-of-service/m_qos-plcshp-oview-0.html) · [QoS Classification, Policing, and Marking (Cisco)](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_lac/configuration/xe-16-9/qos-lac-xe-16-9-book/qos-class-lac.html)"} reuse={false} />

Answer: —
Question 2 · Network Assurance Open

Which statement regarding VXLAN is accurate?

Answer: A VXLAN encapsulates an Ethernet frame in VXLAN, UDP, and IP headers so that Layer 2 traffic can traverse a Layer 3 routed underlay, including across router boundaries. The VXLAN Network Identifier (VNI) is 24 bits and UDP—not TCP—is used as the transport protocol. [RFC 7348: Virtual eXtensible Local Area Network (VXLAN)](https://www.rfc-editor.org/rfc/rfc7348.html) **Learn more:** [RFC 7348: Virtual eXtensible Local Area Network (VXLAN)](https://www.rfc-editor.org/rfc/rfc7348.html)
Question 3 · Network Assurance Open

Which item is contained in the VXLAN header?

Answer: A The VXLAN header carries the 24-bit VXLAN Network Identifier (VNI), which identifies the virtual network for the encapsulated Layer 2 frame. **Learn more:** [Nexus 9000 VXLAN Configuration Guide – Configuring VXLAN (Cisco)](https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/vxlan/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_VXLAN_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_VXLAN_Configuration_Guide_7x_chapter_011.html)