Cisco 300-420 Bundle

Multiple logical VLANs on the same physical CE and provider device do not provide independent failure domains. “Design separate CE devices, access paths and service-provider terminations in accordance with the required availability objective” would remedy that alternative situation, but it would not correct the present issue: n-minus-one operation cannot carry combined load if each remaining link lacks spare capacity or business traffic prioritization.

“Design supported Catalyst SD-WAN orchestrator reachability and certificate trust separately from data-plane transport tunnels” is the supported response when the orchestration function helps WAN edges discover and authenticate to the fabric but should not be placed in the regular data forwarding path. Here the decisive response is “Size redundant WAN capacity for failure-state critical loads or design explicit congestion and traffic-class degradation policy”, so that different intervention does not meet the stated requirement.

Bandwidth alone does not determine application suitability when propagation delay and jitter exceed interactive service limits. “Choose appropriate low-latency WAN transport and QoS treatment, evaluating cost, resilience and route diversity” applies to that other condition. The reported evidence is two regional WAN links each run at eighty percent peak utilization, but design documents promise full service during loss of either one; this alternative would address the wrong dependency.

Secure SD-WAN fabric admission requires authorized organization identifiers and valid identity trust, not just IP routing. “Design approved CA trust, certificate lifecycle and device authorization procedures for every control node and edge” would remedy that alternative situation, but it would not correct the present issue: using only the affected data-plane overlay for operational access can eliminate remote troubleshooting when the fabric fails.

“Design redundant supported SD-WAN Managers with backup, RBAC and regional management reachability as appropriate” is the supported response when management availability and existing data-plane forwarding have different dependencies, while loss of manageability remains an operational risk. Here the decisive response is “Provide an appropriately secured independent management path or out-of-band recovery access for critical WAN edges”, so that different intervention does not meet the stated requirement.

Logical transport labels or TLOCs do not inherently represent independent circuits, carrier facilities or last-mile paths. “Map TLOCs to genuinely diverse approved transport interfaces and validate policy-based failover” applies to that other condition. The reported evidence is operations wants to reach branch edges for troubleshooting through an overlay VPN that might be down during a widespread incident; this alternative would address the wrong dependency.

Unbounded EIGRP query scope and nontransit spokes can prolong active route computation across a large topology. “Validate stub declaration and query-domain boundaries for every newly onboarded nontransit branch” would remedy that alternative situation, but it would not correct the present issue: summary advertisement can attract destinations no longer reachable through the summarizing area, creating a predictable blackhole.

“Govern IS-IS metric templates and perform cost-map reviews when adding high-capacity links or changing topology” is the supported response when mixed or unsuitable metric styles can undermine consistent path-cost planning and overflow the intended metric range. Here the decisive response is “Compare aggregate reachability against live component prefixes during area topology changes”, so that different intervention does not meet the stated requirement.

Protocol adjacency and IPv4 routes do not alone establish correct IPv6 reachability, interface addressing or address-family support. “Test IPv4 and IPv6 reachability separately when extending a stable routing protocol deployment” applies to that other condition. The reported evidence is a regional IS-IS border advertises a broad summary after several internal prefixes have been withdrawn and remote traffic begins hitting an aggregate discard route; this alternative would address the wrong dependency.

RESTCONF uses resource-oriented HTTP methods with defined read and write semantics, so GET is not an appropriate configuration write operation. “Validate method, status-code and error-body handling in network API client tests” would remedy that alternative situation, but it would not correct the present issue: repeated broad request-response polling can impose higher overhead than selective model-driven subscription updates for suitable telemetry.

“Document analytics cadence requirements before selecting telemetry subscription mode” is the supported response when on-change subscriptions report eligible state changes, not necessarily uniformly spaced observations required for some time-series analytics. Here the decisive response is “Measure both publication and collector overhead rather than assuming every telemetry stream is automatically cheaper”, so that different intervention does not meet the stated requirement.

Coarse periodic publication can delay visibility of short state transitions and is not equivalent to supported event-driven on-change reporting. “Test event delivery under frequent flaps and avoid overwhelming collection systems with unbounded updates” applies to that other condition. The reported evidence is a WAN operations team polls thousands of interface counters through legacy SNMP every few seconds and saturates device management CPU during incidents; this alternative would address the wrong dependency.

Legacy community strings do not provide SNMPv3's user-based authentication and encryption capabilities needed by the policy. “Design supported SNMPv3 users, auth/privacy mechanisms, least-privilege views and central credential lifecycle” would remedy that alternative situation, but it would not correct the present issue: a common routing table broadens the management attack surface and increases risk of route or ACL leakage.

“Design redundant remote syslog collectors with protected transport, appropriate facilities and retention controls” is the supported response when local log storage and rollover cannot substitute for reliable centralized timestamped security event retention. Here the decisive response is “Create a supported management VRF or equivalent separated context and tightly controlled shared services as needed”, so that different intervention does not meet the stated requirement.

In-band-only management can share a fault with the network being repaired, eliminating the ability to recover remotely. “Provide secure out-of-band management through independent transport, power and authentication suitable for critical nodes” applies to that other condition. The reported evidence is an enterprise puts SNMP, SSH and backup traffic in the same global routing table as public guest endpoints, complicating access restrictions; this alternative would address the wrong dependency.

That change concerns ospf area 0 resilient backbone, where OSPF hierarchical inter-area connectivity depends on a stable backbone design and resilient area border connectivity. The reported issue instead stems from: A normal area floods external routing information that stub-capable branches may not need when a default route is sufficient.

That change concerns ospf area range summarization, where A fragmented area-address plan and missing ABR inter-area summarization cause avoidable detailed LSAs to propagate. In this question the necessary remedy is “Choose a supported stub-area design consistently across the area and ensure the ABR provides an appropriate default route”, which this alternative does not provide.

That change concerns ospf external route type choice, where External Type 2 cost behavior does not account for internal cost in the same way as Type 1 when external metrics differ. The observed condition is a branch OSPF area has no external-route ASBR but receives unnecessary external LSAs from the backbone and has constrained router memory; this mechanism addresses another problem.

Ordinary underlay reachability does not assign endpoint onboarding and VXLAN edge functions to a nonfabric access device. “Provision eligible access devices as supported fabric edge nodes and verify host onboarding and virtual network assignments” would remedy that alternative situation, but it would not correct the present issue: fabric wireless requires supported controller and edge integration and consistent segmentation assignments for mobile clients.

“Use supported extended-node topology with appropriate fabric-edge parent capacity and port-assignment design” is the supported response when extended nodes and ordinary fabric nodes have distinct supported roles and scale limits; uplink connection alone does not confer every fabric service. Here the decisive response is “Design the supported fabric wireless control-plane and data-plane integration with validated WLAN-to-VN mapping”, so that different intervention does not meet the stated requirement.

Physical underlay IP connectivity does not by itself establish appropriate inter-fabric transit, route exchange and segmentation policy. “Design supported fabric-to-fabric transit via qualified borders and consistent virtual-network route and security policy” applies to that other condition. The reported evidence is wireless clients roam between access points attached to a fabric, but engineers have not designed how controllers integrate with fabric edge nodes and virtual networks; this alternative would address the wrong dependency.

Ordinary underlay reachability does not assign endpoint onboarding and VXLAN edge functions to a nonfabric access device. “Validate fabric-edge software, port roles and endpoint registration during site migration” would remedy that alternative situation, but it would not correct the present issue: extending Layer 2 broadly across campus buildings increases loop, convergence and failure-domain exposure.

“Validate tags and filtering under loss of either redistribution border router” is the supported response when bidirectional multipoint redistribution without route tagging or authoritative direction can reintroduce routes into their source protocol. Here the decisive response is “Set explicit maximum Layer 2 failure domains during new-building network approvals”, so that different intervention does not meet the stated requirement.

A common routing instance cannot enforce independent overlapping IP destinations and controlled route exposure by itself. “Require security approval and route-leak testing for every campus shared-services exception” applies to that other condition. The reported evidence is a multicampus organization extends each access VLAN over multiple buildings to preserve gateway placement, creating a large shared spanning-tree fault domain; this alternative would address the wrong dependency.

Average throughput can hide instantaneous bursts and delay variation that disrupt real-time media even when link utilization seems moderate. “Reserve suitable queue and burst tolerance based on codec behavior, media priority and empirically observed peak load” would remedy that alternative situation, but it would not correct the present issue: traffic classification order and policy constructs can cause broad conditions to overshadow intended more-specific class handling.

“Create degraded-mode QoS and application admission policy based on backup capacity and essential services” is the supported response when policy percentages alone do not preserve service if critical aggregate traffic exceeds reduced failover link capacity. Here the decisive response is “Refine class-map criteria and supported policy evaluation to classify the real-time flows before generic groups”, so that different intervention does not meet the stated requirement.

A syntactically installed QoS policy does not establish that actual applications match intended classes or receive required forwarding treatment. “Run controlled traffic tests and inspect class and queue counters, delay and drop statistics end to end” applies to that other condition. The reported evidence is a provider WAN policy places a broad match-any business group before a specific real-time collaboration class, so important voice traffic gets generic treatment; this alternative would address the wrong dependency.

That change concerns qos classification encrypted traffic, where Encryption hides much application payload from intermediate classifiers, so deep packet inspection may not see per-app content inside the tunnel. The reported issue instead stems from: Random early detection is usually better aligned with responsive TCP queues than with high-priority delay-sensitive voice traffic.

That change concerns qos remarking across carrier boundary, where DSCP semantics and provider class-of-service mappings are not necessarily preserved across an independent administrative domain. In this question the necessary remedy is “Use appropriate congestion avoidance on suitable best-effort TCP classes and protect voice through controlled priority service”, which this alternative does not provide.

That change concerns call admission and voice capacity, where Priority queuing alone cannot create bandwidth beyond circuit capacity, and too many concurrent sessions can oversubscribe voice allocation. The observed condition is a network team enables WRED on the expedited voice queue and expects random early drops to improve low-latency real-time delivery; this mechanism addresses another problem.

That change concerns eigrp route summarization at hub, where Unnecessary specific-route propagation increases state and change sensitivity without providing required central policy detail. The reported issue instead stems from: OSPF hierarchical inter-area connectivity depends on a stable backbone design and resilient area border connectivity.

That change concerns ospf area range summarization, where A fragmented area-address plan and missing ABR inter-area summarization cause avoidable detailed LSAs to propagate. In this question the necessary remedy is “Design redundant ABRs with valid backbone area connectivity and deterministic cost preferences for inter-area paths”, which this alternative does not provide.

That change concerns ospf nssa external redistribution, where A totally stubby or regular stub area cannot originate external LSAs through an internal ASBR in the required manner. The observed condition is an enterprise creates several OSPF nonbackbone areas linked through a single fragile ABR with no alternate route into area zero; this mechanism addresses another problem.