300-420 Exam Dumps : Designing Cisco Enterprise Networks

The correct model set is the one that configures the IOS XE interface GigabitEthernet2/1/0 with IPv4 address 10.10.10.10 and prefix length 27 using valid XML according to the selected YANG schema. The directly connected host address 10.10.10.1/27 confirms the subnet relationship; both addresses belong to 10.10.10.0/27, so the interface configuration must use that prefix length rather than a host mask or an unrelated network. YANG-based configuration is strict: the namespace, container hierarchy, interface type, interface name, and address fields must match the device model. If an option places GigabitEthernet under the wrong container, represents the mask incorrectly, or uses a schema from a different model family, the device will reject the payload or configure the wrong object. Option D correctly represents the IOS XE XML structure and the required addressing. In real operations, the engineer should follow this with a get-config readback against the running datastore to prove that the structured configuration committed as intended. Reference topics: IOS XE interface YANG, XML payload structure, NETCONF configuration, IPv4 subnet validation.

Graceful restart and nonstop forwarding designs depend on preserving forwarding continuity during a control-plane processor switchover. Cisco Stateful Switchover provides the mechanism for a standby route processor or supervisor to maintain synchronized state so it can assume control when the active processor fails. When SSO is combined with NSF or graceful restart capabilities in routing protocols, neighboring devices can continue forwarding traffic while the restarting device preserves or rebuilds control-plane adjacencies. Cisco Express Forwarding is required for fast data-plane forwarding, but CEF alone does not provide route processor state synchronization after processor failure. Virtual Switch System is a chassis or switching architecture that can provide high availability in certain campus designs, but it is not the required feature named by graceful restart recovery. Bidirectional Forwarding Detection is a failure-detection protocol used to detect path or neighbor failures quickly; it does not recover a failed processor. Therefore, the feature that must be incorporated for graceful restart recovery from processor failure is Stateful Switchover. In a resilient enterprise design, SSO, NSF, and protocol graceful restart are coordinated to reduce outage impact.

Cisco traffic policing evaluates packets against a configured traffic contract and classifies them into action states such as conforming, exceeding, and violating. The policy then applies configured actions to those states, such as transmit, drop, or remark. In a two-rate or three-color policing design, conforming traffic is within the committed rate, exceeding traffic is above the committed rate but may still be within an excess burst allowance, and violating traffic is outside the permitted profile. Therefore, conforming and violating are valid policing parameters or state/action categories in the context of the question. Shaping is not a policing parameter; it is a different QoS mechanism that buffers excess traffic and sends it later. Marking can be an action applied by policing, but the listed policing state that directly corresponds to Cisco class-based policing syntax is conform or violate. Bursting is related to token bucket sizing, but the answer choices specifically align to policing state categories. The correct pair is violating and conforming.