Cisco 300-420 Bundle

A shared provider routing domain cannot preserve independent overlapping tenant address spaces and route targets without isolation. “Select a supported MPLS L3VPN design using separate VPN routing tables and approved route-target import/export policy” would remedy that alternative situation, but it would not correct the present issue: ordinary port-level upgrades may not meet aggregate fiber-capacity and distance requirements when the optical transport must host many independent wavelengths.

“Choose appropriate Metro Ethernet point-to-point or multipoint service topology with explicit VLAN and loop-avoidance design” is the supported response when multipoint Ethernet services and many independent E-Line circuits have different Layer 2 forwarding and spanning-tree implications. Here the decisive response is “Evaluate supported DWDM wavelengths, optics, optical budget, dispersion and protection channels for the transport 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 two data centers need many high-throughput channels over existing dark fiber but an architect proposes a single low-rate Ethernet handoff for each future application; 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: ASM initially uses a shared RP tree and may switch to source-specific shortest-path forwarding according to design and platform behavior.

That change concerns pim bidirectional many to many traffic, where A dense many-to-many application can impose excessive source tree state if its delivery model ignores suitable shared bidirectional multicast designs. In this question the necessary remedy is “Evaluate supported SPT threshold and source-tree design for bandwidth and latency goals without creating RPF inconsistencies”, which this alternative does not provide.

That change concerns igmpv3 receiver source specification, where Source-specific multicast applications need supported source-aware receiver membership signaling, commonly IGMPv3 for IPv4. The observed condition is a PIM sparse-mode ASM network sends high-rate streaming traffic through the rendezvous point even after receivers could reach a more efficient source tree; this mechanism addresses another problem.

Uncontrolled bidirectional redistribution can reintroduce routes, create loops and lose source-of-truth route preference. “Use explicit tag-based redistribution policy, defined metrics and directional filters at well-documented borders” would remedy that alternative situation, but it would not correct the present issue: unnecessary specific-route propagation increases state and change sensitivity without providing required central policy detail.

“Review reported and feasible distances and design valid loop-free alternatives rather than forcing an invalid candidate” is the supported response when an EIGRP feasible successor must satisfy its feasibility condition relative to the successor's feasible distance to prevent loops. Here the decisive response is “Apply well-bounded route summaries at distribution interfaces only after validating component networks and discard consequences”, so that different intervention does not meet the stated requirement.

EIGRP unequal-cost load sharing is not enabled simply because multiple routes exist and is constrained by feasibility and variance. “Assess feasible successors and apply an approved variance design with realistic traffic-share expectations” applies to that other condition. The reported evidence is a distribution router advertises every tiny branch prefix separately into the EIGRP core even though branches are allocated in contiguous blocks; this alternative would address the wrong dependency.

A dense many-to-many application can impose excessive source tree state if its delivery model ignores suitable shared bidirectional multicast designs. “Evaluate bidirectional PIM or another supported distribution method against source count, RP and security requirements” would remedy that alternative situation, but it would not correct the present issue: source-specific multicast applications need supported source-aware receiver membership signaling, commonly IGMPv3 for IPv4.

“Design suitable PIM interface priorities and neighbor reachability for predictable designated-router selection” is the supported response when PIM DR election provides a defined designated router role on a multiaccess segment to avoid conflicting join responsibilities. Here the decisive response is “Design SSM-compatible group range, sender addressing and receiver IGMPv3 support end to end”, so that different intervention does not meet the stated requirement.

ASM initially uses a shared RP tree and may switch to source-specific shortest-path forwarding according to design and platform behavior. “Evaluate supported SPT threshold and source-tree design for bandwidth and latency goals without creating RPF inconsistencies” applies to that other condition. The reported evidence is a video delivery platform wants receivers to accept only one known multicast source per group but the access network uses receiver signaling that cannot express source preference; this alternative would address the wrong dependency.

That change concerns sd access redundant control plane nodes, where A single endpoint map/control-plane service is a common-mode availability risk even with redundant data-plane links. The reported issue instead stems from: A virtualized or stacked switching design needs supported control, state and multichassis link mechanisms to act as one logical system.

That change concerns graceful restart campus routing continuity, where Routing graceful restart requires compatible neighbor capability and safe stale-route lifetimes, not merely redundant uplinks. In this question the necessary remedy is “Select a validated stacking or virtual-switch architecture and plan supervisor, interconnect and software compatibility”, which this alternative does not provide.

That change concerns bfd campus uplink detection, where Carrier detection at the local switch does not necessarily detect loss of a remote routed neighbor or intermediate path. The observed condition is two distribution switches are intended to behave as one logical platform, but engineers assume separate independent control planes deliver the same cross-chassis link semantics; this mechanism addresses another problem.

Local breakout bypasses central inspection unless equivalent secure edge controls and policy are deliberately placed. “Treat breakout decisions as combined WAN and security design approvals rather than routing-only changes” 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.

“Inventory the physical dependencies of each SD-WAN color before declaring path redundancy” is the supported response when logical transport labels or TLOCs do not inherently represent independent circuits, carrier facilities or last-mile paths. Here the decisive response is “Include recovery-path isolation and management access policy in branch deployment standards”, so that different intervention does not meet the stated requirement.

Management availability and existing data-plane forwarding have different dependencies, while loss of manageability remains an operational risk. “Separate management-plane restoration targets from traffic-plane availability objectives in SLA design” 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.

External Type 2 cost behavior does not account for internal cost in the same way as Type 1 when external metrics differ. “Document OSPF external metric type as part of every redistribution design review” would remedy that alternative situation, but it would not correct the present issue: a fragmented area-address plan and missing ABR inter-area summarization cause avoidable detailed LSAs to propagate.

“Review area stub restrictions and ASBR needs before switching any area type” is the supported response when a normal area floods external routing information that stub-capable branches may not need when a default route is sufficient. Here the decisive response is “Keep OSPF area allocation aligned with IPAM aggregation boundaries across expansion projects”, so that different intervention does not meet the stated requirement.

OSPF hierarchical inter-area connectivity depends on a stable backbone design and resilient area border connectivity. “Evaluate area zero failure domains and ABR diversity before placing mission-critical applications in branch areas” applies to that other condition. The reported evidence is dozens of contiguous branch prefixes are flooded individually into the OSPF backbone after a regional restructuring, increasing LSDB churn; 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: per-flow IntServ state scales differently from aggregated DiffServ classes and can become operationally expensive for large multi-site deployments.

“Reserve low-latency priority treatment for justified real-time traffic with controlled bandwidth and balanced class allocations” is the supported response when an oversized or unbounded strict-priority queue can consume interface capacity and deny adequate service to other classes. Here the decisive response is “Choose a scalable DiffServ class-based policy where application requirements permit, reserving per-flow mechanisms for justified domains”, so that different intervention does not meet the stated requirement.

A high-speed physical port does not imply equal committed service rate, so uncontrolled bursts can be discarded in the provider network. “Shape outbound traffic to a suitable rate below the provider policer and apply useful internal priority queues” applies to that other condition. The reported evidence is a campus WAN operator proposes maintaining individual RSVP reservations for every video stream across thousands of remote endpoints despite modest router control capacity; this alternative would address the wrong dependency.

Carrier detection at the local switch does not necessarily detect loss of a remote routed neighbor or intermediate path. “Monitor false BFD flaps and hardware resource limits when tightening liveness timers across many peers” would remedy that alternative situation, but it would not correct the present issue: fabric overlay endpoints require a suitable border function to exchange external route reachability with nonfabric networks.

“Validate fabric-edge software, port roles and endpoint registration during site migration” is the supported response when ordinary underlay reachability does not assign endpoint onboarding and VXLAN edge functions to a nonfabric access device. Here the decisive response is “Evaluate border redundancy, route advertisement scope and external underlay handoff before deployment”, so that different intervention does not meet the stated requirement.

A fabric control plane supplies locator information, while the data plane uses supported VXLAN encapsulation to carry endpoint traffic. “Separate control-plane mapping checks from data-plane tunnel validation in incident runbooks” applies to that other condition. The reported evidence is fabric users can communicate internally, but no external network reaches them because no node provides the correct border between fabric and traditional campus routing; this alternative would address the wrong dependency.

Mixed or unsuitable metric styles can undermine consistent path-cost planning and overflow the intended metric range. “Standardize supported wide-metric design and audit interface cost policies across participating IS-IS devices” would remedy that alternative situation, but it would not correct the present issue: an unprotected adjacency trust boundary can admit unauthorized IS-IS control messages into a routing domain.

“Declare eligible nontransit branches as EIGRP stubs and summarize at appropriate aggregation points with verified alternate paths” is the supported response when unbounded EIGRP query scope and nontransit spokes can prolong active route computation across a large topology. Here the decisive response is “Deploy supported IS-IS authentication with coordinated algorithms and keys and restrict peers to intended segments”, so that different intervention does not meet the stated requirement.

Summary advertisement can attract destinations no longer reachable through the summarizing area, creating a predictable blackhole. “Advertise summaries only with valid downstream coverage or an explicitly documented safe discard and failover behavior” applies to that other condition. The reported evidence is routing peers on a shared provider Ethernet segment accept IS-IS adjacencies without authentication, allowing an unintended device to affect topology calculations; this alternative would address the wrong dependency.

Standardized models do not necessarily represent every vendor-specific operational or configuration feature. “Keep proprietary model use isolated and documented so future portability work remains manageable” would remedy that alternative situation, but it would not correct the present issue: NETCONF and RESTCONF share model-driven concepts but use different protocol transports, operation semantics and session behavior.

“Test event delivery under frequent flaps and avoid overwhelming collection systems with unbounded updates” is the supported response when coarse periodic publication can delay visibility of short state transitions and is not equivalent to supported event-driven on-change reporting. Here the decisive response is “Run interoperability tests for protocol authentication, payload encoding and error handling before deployment”, so that different intervention does not meet the stated requirement.

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” applies to that other condition. The reported evidence is a controller team chooses NETCONF for an HTTP-native integration solely because both interfaces use YANG models and assumes their framing and transports are interchangeable; this alternative would address the wrong dependency.