Cisco 300-420 Bundle

That change concerns network management vrf segmentation, where A common routing table broadens the management attack surface and increases risk of route or ACL leakage. The reported issue instead stems from: Independent rendezvous points do not automatically exchange all active-source information across ASM multicast domains.

That change concerns multicast designated router selection, where PIM DR election provides a defined designated router role on a multiaccess segment to avoid conflicting join responsibilities. In this question the necessary remedy is “Use supported MSDP or a suitable alternative interdomain multicast design with appropriate RP and source policies”, which this alternative does not provide.

That change concerns multicast source shortest path tree switchover, where ASM initially uses a shared RP tree and may switch to source-specific shortest-path forwarding according to design and platform behavior. The observed condition is two autonomous multicast domains each run PIM sparse mode with separate RPs, but receivers in one domain cannot discover active senders in the other; this mechanism addresses another problem.

That change concerns out of band network management resiliency, where In-band-only management can share a fault with the network being repaired, eliminating the ability to recover remotely. The reported issue instead stems from: A syntactically installed QoS policy does not establish that actual applications match intended classes or receive required forwarding treatment.

That change concerns video traffic burst and jitter buffer design, where Average throughput can hide instantaneous bursts and delay variation that disrupt real-time media even when link utilization seems moderate. In this question the necessary remedy is “Run controlled traffic tests and inspect class and queue counters, delay and drop statistics end to end”, which this alternative does not provide.

That change concerns qos oversubscription during backup, where Policy percentages alone do not preserve service if critical aggregate traffic exceeds reduced failover link capacity. The observed condition is an enterprise labels its QoS design complete because configuration commands were accepted but never checks packet classifications or queue drops; this mechanism addresses another problem.

Independent rendezvous points do not automatically exchange all active-source information across ASM multicast domains. “Use supported MSDP or a suitable alternative interdomain multicast design with appropriate RP and source policies” would remedy that alternative situation, but it would not correct the present issue: overly aggressive polling can consume limited control-plane CPU and management bandwidth without improving decision quality.

“Design correct multicast reverse paths and compatible unicast routing so upstream interfaces pass the RPF check” is the supported response when multicast RPF typically checks the route back toward the source or RP, not merely whether a receiver destination is reachable. Here the decisive response is “Select telemetry collection intervals and methods proportional to observed change rates and device capacity”, so that different intervention does not meet the stated requirement.

ASM shared-tree setup may depend on reachable RP control functions that need deliberate redundancy. “Design supported redundant RP mechanisms with consistent group mappings and reachability across the multicast domain” applies to that other condition. The reported evidence is a team polls every interface on hundreds of switches every second over the production WAN and then experiences management-plane load spikes; this alternative would address the wrong dependency.

An MPLS Layer 3 VPN routes IP among separated CE networks rather than delivering a transparent Layer 2 Ethernet service. “Assess broadcast extension failure domains before buying a transparent transport solely to avoid route design” 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.

“Audit route policy and tenant VPN scoping when adding branches to SD-WAN regions” is the supported response when data-plane tunnel presence does not guarantee that control-plane route advertisement and segmentation policy deliver needed service prefixes. Here the decisive response is “Separate management-plane restoration targets from traffic-plane availability objectives in SLA design”, 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. “Inventory the physical dependencies of each SD-WAN color before declaring path redundancy” 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.

Service encapsulation consumes transport overhead and can exceed an underlay MTU that was sized only for native Ethernet payloads. “Include provider label and VLAN overhead in handoff acceptance tests and service contracts” 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.

“Review VPN shortcut and route optimization features whenever security architecture mandates central inspection” is the supported response when shortcut VPN topology changes can bypass required inspection if the WAN policy assumes every flow transits a central hub. Here the decisive response is “Track physical and provider diversity from rack power to metro access rather than counting only service circuit IDs”, 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. “Validate provider policy and route advertisement behavior after every BGP contract change” 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 equal cost site routing load sharing, where Physical redundancy does not imply control-plane equal-cost path installation or useful flow distribution. The reported issue instead stems from: Fabric control-plane endpoint-to-location mapping must reflect movement and be consistent with current host registration.

That change concerns sd access border node external integration, where Fabric overlay endpoints require a suitable border function to exchange external route reachability with nonfabric networks. In this question the necessary remedy is “Use supported redundant LISP control-plane nodes and verify endpoint registration and mapping refresh behavior”, which this alternative does not provide.

That change concerns sd access underlay mtu and ip reachability, where Fabric overlay encapsulation adds overhead beyond ordinary IP reachability and depends on a healthy L3 underlay. The observed condition is a fabric edge learns an endpoint address but forwards to an old location after the endpoint moves between buildings because its mapping data is stale; this mechanism addresses another problem.

A hybrid deployment can transfer sensitive data or metadata across administrative and geographic boundaries even when application compute stays on-premises. “Design controlled hybrid data flow, regional placement and access policies that satisfy residency and connectivity requirements” would remedy that alternative situation, but it would not correct the present issue: private transport does not automatically enforce tenant segmentation or prevent unintended route exchange into cloud environments.

“Design redundant cloud interconnects with suitable facility diversity, BGP and controlled Internet or secondary private fallback” is the supported response when logical network separation on one physical direct-connect facility does not eliminate common power, provider or meet-me-room failures. Here the decisive response is “Integrate MPLS L3VPN with approved cloud private routing and select per-tenant VRF and gateway route policies”, so that different intervention does not meet the stated requirement.

TLS mutual authentication depends on valid identity and trust configuration, independent of basic network reachability. “Deploy approved certificates and trust anchors for the telemetry endpoint and collector, including correct service identity names” applies to that other condition. The reported evidence is a financial institution wants dedicated provider L3VPN connectivity to cloud private resources and proposes exporting every enterprise VRF into one common cloud virtual network; this alternative would address the wrong dependency.

That change concerns carrier layer 2 vpn mtu requirements, where Service encapsulation consumes transport overhead and can exceed an underlay MTU that was sized only for native Ethernet payloads. The reported issue instead stems from: Local interface carrier may remain up when upstream service fails, so a static route without health tracking can blackhole traffic.

That change concerns site to site vpn hub hairpin inspection, where Shortcut VPN topology changes can bypass required inspection if the WAN policy assumes every flow transits a central hub. In this question the necessary remedy is “Use supported service probing and tracked next-hop or routing convergence to withdraw an unusable primary path”, which this alternative does not provide.

That change concerns multihomed BGP provider route preference, where Uncontrolled multihoming can select unpredictable exits and cause asymmetry or suboptimal paths under provider changes. The observed condition is a branch prefers fiber Internet over backup DSL but its static primary default route remains installed after an upstream outage beyond the local Ethernet handoff; this mechanism addresses another problem.

A hybrid deployment can transfer sensitive data or metadata across administrative and geographic boundaries even when application compute stays on-premises. “Design controlled hybrid data flow, regional placement and access policies that satisfy residency and connectivity requirements” would remedy that alternative situation, but it would not correct the present issue: cloud service models allocate operational responsibility differently; consuming PaaS normally shifts underlying host management while retaining customer data and access duties.

“Deploy approved certificates and trust anchors for the telemetry endpoint and collector, including correct service identity names” is the supported response when TLS mutual authentication depends on valid identity and trust configuration, independent of basic network reachability. Here the decisive response is “Choose a suitable SaaS, PaaS or IaaS architecture with an explicit responsibility matrix for app, identity, runtime and infrastructure”, 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 development team moves a legacy application to a managed PaaS runtime but budgets for patching its underlying virtual machine host while leaving application access controls unowned; this alternative would address the wrong dependency.

That change concerns stp root guard toward untrusted switch, where Superior BPDUs on an untrusted downstream link can alter STP root selection unless the boundary is protected. The reported issue instead stems from: FHRP peers must exchange control messages in a correctly shared VLAN to maintain a single active forwarding role.

That change concerns hsrp upstream interface tracking, where FHRP presence alone may not account for upstream path viability without appropriate object or interface tracking. In this question the necessary remedy is “Restore approved VLAN trunk reachability and compatible HSRP group and timer settings across both devices”, which this alternative does not provide.

That change concerns glbp unequal gateway load sharing, where Traditional active-standby first-hop redundancy does not by itself provide the desired per-client gateway load distribution. The observed condition is two redundant distribution switches both believe they are HSRP active after a VLAN trunk blocks hello messages, causing inconsistent gateway ARP responses; this mechanism addresses another problem.

That change concerns multicast rp address placement strategy, where RP location affects shared-tree path efficiency and control resilience for ASM groups and can create a remote common-mode dependency. The reported issue instead stems from: Naive replicated unicast can consume far more shared-link capacity than a suitable multicast tree for many receivers.

That change concerns multicast boundary group filtering, where Without explicit multicast boundary control, group advertisements or forwarding may extend beyond authorized trust domains. In this question the necessary remedy is “Assess multicast replication at branching points or other supported content distribution design with receiver policy”, which this alternative does not provide.

That change concerns pim sparse mode receiver path joins, where PIM sparse mode forwarding relies on supported multicast routing and receiver membership along the required multicast distribution tree. The observed condition is a regional network distributes one 20 Mbps live event to sixty branches by sending sixty independent copies across the same core link; this mechanism addresses another problem.