Cisco 300-420 Bundle

Trusting unvalidated endpoint DSCP markings allows unauthorized traffic to consume preferential network resources. “Audit QoS trust maps when onboarding new endpoint types or enabling unmanaged switch ports” would remedy that alternative situation, but it would not correct the present issue: an oversized or unbounded strict-priority queue can consume interface capacity and deny adequate service to other classes.

“Evaluate per-flow state, class counts and provider behavior before committing to any QoS architecture” is the supported response when per-flow IntServ state scales differently from aggregated DiffServ classes and can become operationally expensive for large multi-site deployments. Here the decisive response is “Review queue bandwidth guarantees and peak-rate policing as service demand changes”, 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. “Revalidate shaping rates against provider CIR and accounting overhead after circuit or device changes” applies to that other condition. The reported evidence is an enterprise places voice, video, backups and database replication in one strict-priority class, and ordinary business applications starve during a site backup; this alternative would address the wrong dependency.

Local interface carrier may remain up when upstream service fails, so a static route without health tracking can blackhole traffic. “Use supported service probing and tracked next-hop or routing convergence to withdraw an unusable primary path” would remedy that alternative situation, but it would not correct the present issue: management availability and existing data-plane forwarding have different dependencies, while loss of manageability remains an operational risk.

“Map TLOCs to genuinely diverse approved transport interfaces and validate policy-based failover” 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 “Design redundant supported SD-WAN Managers with backup, RBAC and regional management reachability as appropriate”, so that different intervention does not meet the stated requirement.

Data-plane tunnel presence does not guarantee that control-plane route advertisement and segmentation policy deliver needed service prefixes. “Validate OMP route advertisements and centralized policy across controllers with intended VPN and TLOC eligibility” applies to that other condition. The reported evidence is an enterprise relies on a single remote management platform for all SD-WAN configuration and assumes controller outage is equivalent to immediate edge forwarding loss; this alternative would address the wrong dependency.

Overly aggressive polling can consume limited control-plane CPU and management bandwidth without improving decision quality. “Select telemetry collection intervals and methods proportional to observed change rates and device capacity” would remedy that alternative situation, but it would not correct the present issue: ASM shared-tree setup may depend on reachable RP control functions that need deliberate redundancy.

“Use resilient approved NTP sources with authenticated or trusted network delivery where supported” is the supported response when uncoordinated system clocks undermine log chronology, audit correlation and incident reconstruction. Here the decisive response is “Design supported redundant RP mechanisms with consistent group mappings and reachability across the multicast domain”, so that different intervention does not meet the stated requirement.

Central monitoring infrastructure can become a single point of failure even when individual access devices have redundant uplinks. “Design appropriate collector and transport redundancy with supported failover and secure retention behavior” applies to that other condition. The reported evidence is a campus deploys PIM sparse mode ASM with one rendezvous point and loses new receiver joins whenever that RP router is unavailable; this alternative would address the wrong dependency.

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 reported issue instead stems from: BGP aggregation can hide component failures and attract traffic for unreachable portions of the summarized prefix.

That change concerns BGP multipath equal cost eligibility, where BGP additional paths must satisfy supported multipath eligibility rules and configured maximum-path policy to share traffic. In this question the necessary remedy is “Choose an aggregate policy with reviewed component-route dependencies, conservative discard behavior and correct reachability design”, which this alternative does not provide.

That change concerns BGP community-based export policy, where Manual per-prefix policy misses newly onboarded routes when attributes and export rules are not centrally classified. The observed condition is a border advertises a BGP aggregate for several site prefixes but after one internal site is withdrawn, the advertised summary still attracts traffic to its unavailable block; this mechanism addresses another problem.

That change concerns cloud direct connect redundant circuits, where Logical network separation on one physical direct-connect facility does not eliminate common power, provider or meet-me-room failures. The reported issue instead stems from: TLS mutual authentication depends on valid identity and trust configuration, independent of basic network reachability.

That change concerns cloud on ramp sd wan policy, where Traditional centralized route topology can add delay and consume backbone capacity even when local cloud on-ramp options are available. In this question the necessary remedy is “Deploy approved certificates and trust anchors for the telemetry endpoint and collector, including correct service identity names”, which this alternative does not provide.

That change concerns mpls direct cloud provider integration, where Private transport does not automatically enforce tenant segmentation or prevent unintended route exchange into cloud environments. The observed condition is a new telemetry collector can reach router TCP ports but the router refuses the gRPC session because the client and server certificate trust chains are not configured; this mechanism addresses another problem.

Machine-readable data model revisions and capabilities can differ across platform versions even if management connectivity remains healthy. “Include API schema contract tests and rollback in every network software upgrade program” would remedy that alternative situation, but it would not correct the present issue: a hybrid deployment can transfer sensitive data or metadata across administrative and geographic boundaries even when application compute stays on-premises.

“Keep proprietary model use isolated and documented so future portability work remains manageable” is the supported response when standardized models do not necessarily represent every vendor-specific operational or configuration feature. Here the decisive response is “Conduct data-flow mapping and legal residency checks before selecting hybrid SaaS and managed-service integrations”, so that different intervention does not meet the stated requirement.

Cloud service models allocate operational responsibility differently; consuming PaaS normally shifts underlying host management while retaining customer data and access duties. “Review shared-responsibility assignments at every workload migration and cloud provider contract change” applies to that other condition. The reported evidence is an enterprise has customer records that must remain in a private data center but moves its analytics control plane to a public cloud SaaS service without examining metadata export; 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: Randomly scattered branch subnets prevent region-level summarization and make routing and change control unnecessarily complex.

That change concerns overlapping ipv4 address after acquisition, where Overlapping address spaces are ambiguous to ordinary destination-based routing and require unique addressing or deliberate translation boundaries. In this question the necessary remedy is “Reserve contiguous region-sized address blocks, allocate branch VLSM prefixes inside each block and summarize only reachable ranges at distribution boundaries”, which this alternative does not provide.

That change concerns vlsm sized campus user allocation, where An IPv4 /27 ordinarily has only thirty usable host addresses, so it cannot accommodate the stated phones and gateway. The observed condition 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 mechanism addresses another problem.

Neighbor authentication parameters and permitted key windows must align or the routing protocol rejects peer messages. “Coordinate supported EIGRP authentication changes and key rollover across both peers with safe cutover” would remedy that alternative situation, but it would not correct the present issue: EIGRP unequal-cost load sharing is not enabled simply because multiple routes exist and is constrained by feasibility and variance.

“Use explicit tag-based redistribution policy, defined metrics and directional filters at well-documented borders” is the supported response when uncontrolled bidirectional redistribution can reintroduce routes, create loops and lose source-of-truth route preference. Here the decisive response is “Assess feasible successors and apply an approved variance design with realistic traffic-share expectations”, so that different intervention does not meet the stated requirement.

Unnecessary specific-route propagation increases state and change sensitivity without providing required central policy detail. “Apply well-bounded route summaries at distribution interfaces only after validating component networks and discard consequences” applies to that other condition. The reported evidence is a regional hub has a primary 100 Mbps path and secondary 50 Mbps path and wants controlled EIGRP unequal-cost use, but the default setting installs only equal-cost routes; this alternative would address the wrong dependency.

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 overlay encapsulation adds overhead beyond ordinary IP reachability and depends on a healthy L3 underlay.

“Design overlay forwarding paths with validated VXLAN reachability, fabric edge encapsulation and proper transport MTU” is the supported response when a fabric control plane supplies locator information, while the data plane uses supported VXLAN encapsulation to carry endpoint traffic. Here the decisive response is “Provide resilient IP underlay reachability and adequate end-to-end MTU for supported fabric encapsulation”, so that different intervention does not meet the stated requirement.

Fabric overlay endpoints require a suitable border function to exchange external route reachability with nonfabric networks. “Select appropriate fabric border nodes and external routing policy matching the site's transit and segmentation needs” applies to that other condition. The reported evidence is a new SD-Access fabric edge can reach control nodes by IP but VXLAN user traffic fails because the routed underlay path has insufficient MTU; this alternative would address the wrong dependency.

Without port security or identity-aware access control, a simple access port may learn multiple endpoint MAC addresses without limitation. “Deploy suitable port security or 802.1X/MAB policies with sensible violation and recovery handling for endpoint types” would remedy that alternative situation, but it would not correct the present issue: etherChannel members need compatible Layer 2 settings and negotiated bundling state to represent a correct logical link.

“Use a validated multichassis EtherChannel, virtual switching, or routed dual-homing design for platform capabilities” is the supported response when a conventional port channel cannot span unrelated independent switches without a supported multichassis or stacking mechanism. Here the decisive response is “Standardize member configuration and use supported LACP negotiation and consistency checks for the port channel”, so that different intervention does not meet the stated requirement.

Ordinary directed and local broadcasts do not automatically cross routed boundaries, so an explicit authorized delivery design is required. “Design secure supported WoL relays, proxy agents or local management distribution rather than exposing unrestricted broadcasts” applies to that other condition. The reported evidence is an access switch bundles two ports toward a distribution switch but one member carries different VLAN tags and the bundle intermittently drops traffic; this alternative would address the wrong dependency.

On-change subscriptions report eligible state changes, not necessarily uniformly spaced observations required for some time-series analytics. “Choose supported periodic or sample telemetry publication with a suitable interval for the planning metric” would remedy that alternative situation, but it would not correct the present issue: coarse periodic publication can delay visibility of short state transitions and is not equivalent to supported event-driven on-change reporting.

“Match API protocol to the orchestrator requirements and supported device capabilities, including SSH/XML NETCONF or HTTP/RESTCONF workflows” is the supported response when NETCONF and RESTCONF share model-driven concepts but use different protocol transports, operation semantics and session behavior. Here the decisive response is “Use supported on-change telemetry for the neighbor state path with safeguards for subscriber load and update volume”, so that different intervention does not meet the stated requirement.

Repeated broad request-response polling can impose higher overhead than selective model-driven subscription updates for suitable telemetry. “Use platform-supported model-driven telemetry subscriptions for required state paths with sensible reporting intervals and collector capacity” applies to that other condition. The reported evidence is a network team wants immediate notification when a BGP neighbor state changes but configures a ten-minute periodic sample on the relevant state model; this alternative would address the wrong dependency.