300-420 Question #62: Real Exam Question with Answer & Explanation

Question

Which consideration must be taken into account when using the DHCP relay feature in a Cisco SD-Access Architecture?

Options

• ADHCP-relay must be enabled on fabric edge nodes to provide the correct mapping of DHCP
• BA DHCP server must be enabled on the border nodes to allow subnets to span multiple fabric
• CDHCP servers must support Cisco SD-Access extensions to correctly assign IPs to endpoints in
• DDHCP Option-82 must be enabled to map the circuit IP option to the access fabric node where

Explanation

{"question_number": 7, "correct_answer": "D", "explanation": "In a Cisco SD-Access architecture, endpoints connect to fabric edge nodes, and IP addressing is managed through DHCP. The critical consideration is that DHCP Option 82 (DHCP Relay Agent Information Option) must be enabled (D). When a DHCP request arrives at a fabric edge node, Option 82 is used to insert information - specifically the circuit ID - that identifies which fabric edge node the endpoint is connected to. The DHCP server uses this information to assign an IP address from the correct pool, and the SD-Access fabric uses it to build the correct endpoint-to-location mapping in the LISP control plane. Without this, the fabric cannot properly associate endpoints with their location. Option A reverses the responsibility; Option B is incorrect as DHCP servers reside off-fabric; Option C is incorrect as standard DHCP servers work with SD-Access.", "generated_by": "claude-sonnet", "llm_judge_score": 4}

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