Cisco 300-420 Bundle

Ordinary port-level upgrades may not meet aggregate fiber-capacity and distance requirements when the optical transport must host many independent wavelengths. “Evaluate supported DWDM wavelengths, optics, optical budget, dispersion and protection channels for the transport design” would remedy that alternative situation, but it would not correct the present issue: multipoint Ethernet services and many independent E-Line circuits have different Layer 2 forwarding and spanning-tree implications.

“Select a supported MPLS L3VPN design using separate VPN routing tables and approved route-target import/export policy” is the supported response when a shared provider routing domain cannot preserve independent overlapping tenant address spaces and route targets without isolation. Here the decisive response is “Choose appropriate Metro Ethernet point-to-point or multipoint service topology with explicit VLAN and loop-avoidance design”, so that different intervention does not meet the stated requirement.

Mobile backup is useful only if real coverage, policy, cost and failure independence support required branch services. “Design cellular failover with tested signal strength, provider diversity, data-plan capacity and selective critical traffic routing” applies to that other condition. The reported evidence is a manufacturing campus buys point-to-point Ethernet links for twenty buildings but plans to treat the collection as a single broadcast mesh without loop controls; this alternative would address the wrong dependency.

A /15 covers two consecutive aligned /16 networks and the selected /15 omits 10.66.0.0/16 while including unintended space. “Require automated prefix containment and component-reachability validation on every proposed aggregate route advertisement” would remedy that alternative situation, but it would not correct the present issue: a normal area floods external routing information that stub-capable branches may not need when a default route is sufficient.

“Document OSPF external metric type as part of every redistribution design review” is the supported response when external Type 2 cost behavior does not account for internal cost in the same way as Type 1 when external metrics differ. Here the decisive response is “Review area stub restrictions and ASBR needs before switching any area type”, so that different intervention does not meet the stated requirement.

A totally stubby or regular stub area cannot originate external LSAs through an internal ASBR in the required manner. “Verify NSSA translation and ABR failover when adding local redistribution at a stub-like branch” applies to that other condition. The reported evidence is a branch OSPF area has no external-route ASBR but receives unnecessary external LSAs from the backbone and has constrained router memory; this alternative would address the wrong dependency.

That change concerns ipv4 summarization boundary alignment, where A /15 covers two consecutive aligned /16 networks and the selected /15 omits 10.66.0.0/16 while including unintended space. The reported issue instead stems from: An IPv4 /27 ordinarily has only thirty usable host addresses, so it cannot accommodate the stated phones and gateway.

That change concerns ipv6 global enterprise prefix hierarchy, where A flat random allocation from the /48 wastes the opportunity for site-level hierarchy and complicates growth and route summarization. In this question the necessary remedy is “Allocate a suitably sized /25 or larger subnet after accounting for network, broadcast, gateway and expected device growth”, which this alternative does not provide.

That change concerns hierarchical ipv4 addressing plan, where Randomly scattered branch subnets prevent region-level summarization and make routing and change control unnecessarily complex. The observed condition is a campus plans an ordinary IPv4 /27 for a voice VLAN with seventy active phones and expects enough usable addresses after adding a default gateway; this mechanism addresses another problem.

Machine-readable data model revisions and capabilities can differ across platform versions even if management connectivity remains healthy. “Read supported YANG module revisions and capabilities and implement controlled schema compatibility or versioned adapters” would remedy that alternative situation, but it would not correct the present issue: NETCONF can expose candidate datastores, locking and commit operations where supported, unlike assuming every management interface has equivalent transactions.

“Prefer a suitable standards-based IETF model for portable interface telemetry, documenting implementation gaps and vendor extensions” is the supported response when vendor-native data models may expose platform-specific schema that cannot be queried identically across different vendors. Here the decisive response is “Design a supported NETCONF workflow with lock, edit-config, validate, commit and rollback handling for the device capabilities”, so that different intervention does not meet the stated requirement.

OpenConfig provides vendor-neutral model definitions whose implemented paths and capabilities must still be validated per platform. “Select supported OpenConfig telemetry modules, verify revisions and normalize exceptions without assuming universal coverage” applies to that other condition. The reported evidence is a network orchestrator must stage and validate multiple changes before activation but uses isolated individual REST calls with no candidate configuration review; this alternative would address the wrong dependency.

That change concerns BGP graceful restart state retention, where Graceful restart depends on both peers' supported capabilities and bounded stale-route handling, not merely a routing session name. The reported issue instead stems from: Manual per-prefix policy misses newly onboarded routes when attributes and export rules are not centrally classified.

That change concerns BGP aggregate summary discard behavior, where BGP aggregation can hide component failures and attract traffic for unreachable portions of the summarized prefix. In this question the necessary remedy is “Tag routes with an approved community scheme and enforce explicit export policy at each boundary”, which this alternative does not provide.

That change concerns ipv6 gre overlay across ipv4 underlay, where An IPv4-only underlay cannot natively carry IPv6 forwarding without an overlay or other transition capability. The observed condition is an enterprise requires certain partner routes never to be announced to public Internet peers but currently filters using manually maintained individual prefixes only; this mechanism addresses another problem.

Gateway role restoration depends on the selected FHRP protocol and its configured preemption settings, not priority numbers alone. “Document whether automatic takeover or stability-first non-preemption is intended for each critical VLAN” would remedy that alternative situation, but it would not correct the present issue: link redundancy within the fabric does not guarantee sufficient external border forwarding capacity during degraded operation.

“Review transit scalability, border redundancy and trust-boundary translation at every inter-fabric connection” is the supported response when physical underlay IP connectivity does not by itself establish appropriate inter-fabric transit, route exchange and segmentation policy. Here the decisive response is “Use measured peak traffic and failure-mode utilization when capacity planning SD-Access borders”, so that different intervention does not meet the stated requirement.

Extended nodes and ordinary fabric nodes have distinct supported roles and scale limits; uplink connection alone does not confer every fabric service. “Check software and platform support for extended-node quantity and uplink design during rollout” applies to that other condition. The reported evidence is a fabric design has redundant edge uplinks but no redundant border capacity, so a single border failure overloads the remaining exit path; this alternative would address the wrong dependency.

Without explicit multicast boundary control, group advertisements or forwarding may extend beyond authorized trust domains. “Apply supported multicast group or source boundary filtering at the appropriate WAN and tenant interfaces” would remedy that alternative situation, but it would not correct the present issue: PIM sparse mode forwarding relies on supported multicast routing and receiver membership along the required multicast distribution tree.

“Choose strategically located and redundant RPs considering source and receiver topology, routing cost and failover” is the supported response when RP location affects shared-tree path efficiency and control resilience for ASM groups and can create a remote common-mode dependency. Here the decisive response is “Enable appropriate PIM and IGMP behavior on intended routed interfaces and validate RP and RPF reachability”, so that different intervention does not meet the stated requirement.

Naive replicated unicast can consume far more shared-link capacity than a suitable multicast tree for many receivers. “Assess multicast replication at branching points or other supported content distribution design with receiver policy” applies to that other condition. The reported evidence is a multicast stream is sourced at headquarters but branch routers never send joins for newly subscribed remote receivers, despite working unicast tunnels; this alternative would address the wrong dependency.

A single endpoint map/control-plane service is a common-mode availability risk even with redundant data-plane links. “Design supported control-plane node redundancy and test endpoint registration continuity during node loss” would remedy that alternative situation, but it would not correct the present issue: identity group classification requires a trusted policy source and onboarding process rather than arbitrary address-based role guessing.

“Use authorized scalable group tags and matching group-based access policy integrated with the intended identity service” is the supported response when IP-prefix ACLs become brittle when identity and endpoint groups move, while fabric policy can use scalable group-based classification. Here the decisive response is “Integrate the fabric with appropriate Cisco ISE identity policy and validated endpoint profiling or authentication flows”, so that different intervention does not meet the stated requirement.

Security group policy alone may not replace full virtual-network level route isolation where separate macrosegments are required. “Design distinct fabric virtual networks with appropriate external borders and tightly defined shared services” applies to that other condition. The reported evidence is a design team enables fabric segmentation but never integrates network-access authentication and group assignment, assuming switches infer business roles from host IPs; this alternative would address the wrong dependency.

Network dual stacking alone does not add AAAA DNS records, IPv6 listening services, security policy or path validation to existing applications. “Plan application-by-application dual-stack readiness including DNS, access controls, routing, management and rollback verification” would remedy that alternative situation, but it would not correct the present issue: randomly scattered branch subnets prevent region-level summarization and make routing and change control unnecessarily complex.

“Allocate a suitably sized /25 or larger subnet after accounting for network, broadcast, gateway and expected device growth” is the supported response when an IPv4 /27 ordinarily has only thirty usable host addresses, so it cannot accommodate the stated phones and gateway. Here the decisive response is “Reserve contiguous region-sized address blocks, allocate branch VLSM prefixes inside each block and summarize only reachable ranges at distribution boundaries”, so that different intervention does not meet the stated requirement.

Overlapping address spaces are ambiguous to ordinary destination-based routing and require unique addressing or deliberate translation boundaries. “Choose a phased renumbering design or carefully scoped NAT between the overlapping domains with clear DNS and application dependencies” applies to that other condition. The reported evidence is a company has thirty branches that each receive random /24 networks from a central /16. It needs regional route aggregation, predictable expansion and simpler access policies without renumbering annually; this alternative would address the wrong dependency.

IBGP typically preserves the external next hop, which must be reachable through the internal routing infrastructure. “Verify both BGP control-plane route presence and IGP next-hop resolution in every edge design” would remedy that alternative situation, but it would not correct the present issue: local preference is not exported between autonomous systems, so changing it cannot directly govern external networks' inbound selection.

“Validate BGP policy precedence and provider rules instead of assuming MED overrides every upstream preference” is the supported response when internal OSPF cost does not communicate an intended interconnect preference to the neighboring autonomous system. Here the decisive response is “Avoid promising deterministic global inbound routing from prepends, and test provider-specific policy interactions”, so that different intervention does not meet the stated requirement.

AS-path prepending mainly affects remote path selection; outbound path preference within the local AS is commonly controlled with local preference. “Separate inbound and outbound traffic-engineering objectives in BGP policy design documentation” applies to that other condition. The reported evidence is a multihomed public service wants remote networks to prefer one upstream for inbound traffic but changes only its own local preference; this alternative would address the wrong dependency.

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” would remedy that alternative situation, but it would not correct the present issue: local log storage and rollover cannot substitute for reliable centralized timestamped security event retention.

“Classify authentic management flows and allocate controlled minimum service within the WAN's QoS policy” is the supported response when without proper management traffic classification and minimum bandwidth, congestion can starve necessary operations traffic. Here the decisive response is “Design redundant remote syslog collectors with protected transport, appropriate facilities and retention controls”, so that different intervention does not meet the stated requirement.

A common routing table broadens the management attack surface and increases risk of route or ACL leakage. “Create a supported management VRF or equivalent separated context and tightly controlled shared services as needed” applies to that other condition. The reported evidence is a campus router logs only locally and loses fault evidence after flash rotation, despite a requirement for long-term security investigation; this alternative would address the wrong dependency.