Cisco 300-420 Bundle

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: multiple logical VLANs on the same physical CE and provider device do not provide independent failure domains.

“Negotiate and implement supported provider service MTU and customer handoff frame sizes including encapsulation requirements” is the supported response when service encapsulation consumes transport overhead and can exceed an underlay MTU that was sized only for native Ethernet payloads. Here the decisive response is “Design separate CE devices, access paths and service-provider terminations in accordance with the required availability objective”, so that different intervention does not meet the stated requirement.

Uncontrolled multihoming can select unpredictable exits and cause asymmetry or suboptimal paths under provider changes. “Define local preference, inbound announcement policy and health tracking based on primary and backup business requirements” applies to that other condition. The reported evidence is a headquarters site hosts revenue-critical services but all WAN connections terminate on one carrier device and one customer-edge router; this alternative would address the wrong dependency.

That change concerns wan circuit oversubscription under failover, where N-minus-one operation cannot carry combined load if each remaining link lacks spare capacity or business traffic prioritization. The reported issue instead stems from: Multihoming and address translation must account for both directions; outbound route changes alone may not preserve return paths.

That change concerns cisco sd wan orchestration plane purpose, where The orchestration function helps WAN edges discover and authenticate to the fabric but should not be placed in the regular data forwarding path. In this question the necessary remedy is “Design consistent BGP advertisement, NAT and routing failover so return flows follow the reachable secondary path”, which this alternative does not provide.

That change concerns wan path latency versus bandwidth choice, where Bandwidth alone does not determine application suitability when propagation delay and jitter exceed interactive service limits. The observed condition is an enterprise tests its secondary Internet link and sees outbound connectivity, but return traffic continues toward a withdrawn primary public prefix; this mechanism addresses another problem.

That change concerns sd access cisco ise identity policy role, where Identity group classification requires a trusted policy source and onboarding process rather than arbitrary address-based role guessing. The reported issue instead stems from: A single endpoint map/control-plane service is a common-mode availability risk even with redundant data-plane links.

That change concerns sd access sgt micro segmentation, where IP-prefix ACLs become brittle when identity and endpoint groups move, while fabric policy can use scalable group-based classification. In this question the necessary remedy is “Design supported control-plane node redundancy and test endpoint registration continuity during node loss”, which this alternative does not provide.

That change concerns sd access virtual network macro segmentation, where Security group policy alone may not replace full virtual-network level route isolation where separate macrosegments are required. The observed condition is a campus fabric has one control-plane node that maintains all endpoint registrations, and a planned node upgrade makes roaming users unreachable; this mechanism addresses another problem.

That change concerns netconf versus restconf transport selection, where NETCONF and RESTCONF share model-driven concepts but use different protocol transports, operation semantics and session behavior. The reported issue instead stems from: On-change subscriptions report eligible state changes, not necessarily uniformly spaced observations required for some time-series analytics.

That change concerns on change telemetry event notifications, where Coarse periodic publication can delay visibility of short state transitions and is not equivalent to supported event-driven on-change reporting. In this question the necessary remedy is “Choose supported periodic or sample telemetry publication with a suitable interval for the planning metric”, which this alternative does not provide.

That change concerns restconf http method and resource scope, where RESTCONF uses resource-oriented HTTP methods with defined read and write semantics, so GET is not an appropriate configuration write operation. The observed condition is a capacity planning service needs a stable one-minute time series but engineers configure only on-change updates and complain that unchanged gauges disappear; this mechanism addresses another problem.

Overly aggressive polling can consume limited control-plane CPU and management bandwidth without improving decision quality. “Capacity-test telemetry subscription counts and sampling periods before expanding monitoring fleets” 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.

“Test management service continuity as part of data center disaster recovery rather than only device link redundancy” is the supported response when central monitoring infrastructure can become a single point of failure even when individual access devices have redundant uplinks. Here the decisive response is “Include RP election, anycast or redundancy testing during multicast design acceptance”, so that different intervention does not meet the stated requirement.

Uncoordinated system clocks undermine log chronology, audit correlation and incident reconstruction. “Monitor clock drift and NTP source reachability after management VRF and firewall changes” 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.

An SVI routed ACL does not necessarily inspect intra-VLAN switched frames that never reach Layer 3 forwarding. “Design supported VACL, private VLAN or separate VLAN segmentation according to local traffic patterns and platform capabilities” would remedy that alternative situation, but it would not correct the present issue: bidirectional multipoint redistribution without route tagging or authoritative direction can reintroduce routes into their source protocol.

“Design supported VRF-lite routing instances with carefully governed shared-services connectivity and separate interface assignments” is the supported response when a common routing instance cannot enforce independent overlapping IP destinations and controlled route exposure by itself. Here the decisive response is “Apply explicit redistribution filters, tags, metrics and domain ownership at each boundary with deliberate failure fallback”, so that different intervention does not meet the stated requirement.

Extending Layer 2 broadly across campus buildings increases loop, convergence and failure-domain exposure. “Design routed access where supported, using local Layer 3 boundaries and deterministic IGP connectivity between buildings” applies to that other condition. The reported evidence is two campus cores exchange OSPF and EIGRP routes across two border routers and route entries recirculate until suboptimal paths appear; this alternative would address the wrong dependency.

Input classification and policing operate on traffic entering an interface, while output scheduling applies to egress congestion. “Place supported ingress policing and remarking at appropriate boundaries and egress queuing at the actual bottleneck” would remedy that alternative situation, but it would not correct the present issue: average throughput can hide instantaneous bursts and delay variation that disrupt real-time media even when link utilization seems moderate.

“Run controlled traffic tests and inspect class and queue counters, delay and drop statistics end to end” is the supported response when a syntactically installed QoS policy does not establish that actual applications match intended classes or receive required forwarding treatment. Here the decisive response is “Reserve suitable queue and burst tolerance based on codec behavior, media priority and empirically observed peak load”, so that different intervention does not meet the stated requirement.

Traffic classification order and policy constructs can cause broad conditions to overshadow intended more-specific class handling. “Refine class-map criteria and supported policy evaluation to classify the real-time flows before generic groups” applies to that other condition. The reported evidence is interactive training video experiences brief rate bursts, and engineers allocate only average bitrate with no jitter or loss allowance across the WAN; this alternative would address the wrong dependency.

That change concerns ipv6 ula versus global addressing design, where Provider-dependent global prefixes may require renumbering when upstream connectivity changes and do not replace a stable local-only design. The reported issue instead stems from: Typical Ethernet SLAAC uses /64 interface identifiers and ordinary host autoconfiguration expectations are not met by arbitrary longer access prefixes.

That change concerns is-is overload-bit during maintenance, where Premature use of a partially ready intermediate system can blackhole transit despite apparently formed control-plane neighbors. In this question the necessary remedy is “Allocate /64 prefixes for SLAAC access segments while using more specialized lengths only in supported and justified designs”, which this alternative does not provide.

That change concerns dual stack migration dependency planning, where Network dual stacking alone does not add AAAA DNS records, IPv6 listening services, security policy or path validation to existing applications. The observed condition is a network designer attempts to conserve an enterprise /48 by assigning IPv6 /80 prefixes to ordinary SLAAC user LANs, then reports that standard hosts fail autoconfiguration; this mechanism addresses another problem.

Provider-dependent global prefixes may require renumbering when upstream connectivity changes and do not replace a stable local-only design. “Use an appropriately generated unique-local IPv6 prefix for suitable internal services alongside routed global addressing where Internet access is needed” would remedy that alternative situation, but it would not correct the present issue: premature use of a partially ready intermediate system can blackhole transit despite apparently formed control-plane neighbors.

“Design appropriate Level 1 and Level 2 adjacency placement with resilient L1/L2 border routers and reachable inter-area summaries” is the supported response when IS-IS Level 1 operates within an area while Level 2 provides inter-area connectivity and should bound unwanted topology flooding. Here the decisive response is “Use a supported startup overload-bit or similar transient-transit suppression design until the node is ready to forward”, so that different intervention does not meet the stated requirement.

Typical Ethernet SLAAC uses /64 interface identifiers and ordinary host autoconfiguration expectations are not met by arbitrary longer access prefixes. “Allocate /64 prefixes for SLAAC access segments while using more specialized lengths only in supported and justified designs” applies to that other condition. The reported evidence is a router with IS-IS adjacencies comes back after reboot before its forwarding resources and external routes finish loading, but its neighbors immediately use it as a transit node; this alternative would address the wrong dependency.

AS-path prepending mainly affects remote path selection; outbound path preference within the local AS is commonly controlled with local preference. “Set governed BGP local preference on inbound routes from the preferred provider, with consistent internal propagation” would remedy that alternative situation, but it would not correct the present issue: conventional iBGP full mesh grows quadratically and becomes costly to configure, observe and recover.

“Provide appropriate next-hop-self policy or valid internal reachability for external BGP next hops with loop-free forwarding” is the supported response when IBGP typically preserves the external next hop, which must be reachable through the internal routing infrastructure. Here the decisive response is “Introduce redundant route reflectors with appropriate client hierarchy and loop-prevention identifiers”, so that different intervention does not meet the stated requirement.

Internal OSPF cost does not communicate an intended interconnect preference to the neighboring autonomous system. “Use supported BGP MED where appropriate, coordinate the provider's comparison behavior and keep resilient alternate exits” applies to that other condition. The reported evidence is an internal BGP deployment expands to twenty routers using full-mesh sessions and new routers are added without a scalable peer plan; this alternative would address the wrong dependency.

Naive unicast replication can consume excessive WAN capacity, while multicast support depends on platform and overlay design. “Choose a supported multicast distribution and replication approach with measured receiver count and transport constraints” would remedy that alternative situation, but it would not correct the present issue: local breakout bypasses central inspection unless equivalent secure edge controls and policy are deliberately placed.

“Design supported regional controller and overlay architecture with redundancy, policy consistency and documented capacity limits” is the supported response when remote-only controller dependencies and insufficient regional capacity can degrade onboarding, resiliency and convergence at scale. Here the decisive response is “Design approved branch egress security with local firewall, cloud security service or appropriate service chaining”, so that different intervention does not meet the stated requirement.

Static transport preference does not substitute for application-aware path decisions using measured latency, loss and jitter. “Create supported application-aware routing policy with validated SLA class thresholds and fallback behavior” applies to that other condition. The reported evidence is a branch enables direct SaaS Internet breakout to improve performance but the original design assumes all egress is filtered by the data center firewall; this alternative would address the wrong dependency.