300-420 · Question #43
300-420 Question #43: Real Exam Question with Answer & Explanation
The correct answer is A: LISP. {"question_number": 3, "question": "Which control-plane technology allows the same subnet to exist across multiple network locations?", "correct_answer": "A", "explanation": "LISP (Locator/ID Separation Protocol) decouples the Endpoint Identifier (EID) - the IP address/subnet use
Question
Which control-plane technology allows the same subnet to exist across multiple network locations?
Options
- ALISP
- BVXLAN
- CFabricPath
- DISE mobility services
Explanation
{"question_number": 3, "question": "Which control-plane technology allows the same subnet to exist across multiple network locations?", "correct_answer": "A", "explanation": "LISP (Locator/ID Separation Protocol) decouples the Endpoint Identifier (EID) - the IP address/subnet used by the host - from the Routing Locator (RLOC) - the address used to reach the device in the underlay. Because EIDs are registered in a mapping database and are independent of physical location, the same subnet (EID space) can exist simultaneously at multiple sites without causing routing conflicts. This is fundamental to workload mobility and multi-site stretched subnets. VXLAN is a data-plane encapsulation protocol (not a control-plane identity solution), FabricPath is a Cisco proprietary L2 fabric technology, and ISE mobility services handle identity and policy, not subnet location separation.", "generated_by": "claude-sonnet", "llm_judge_score": 4}
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