Cisco 300-420 Bundle

Extending Layer 2 broadly across campus buildings increases loop, convergence and failure-domain exposure. “Set explicit maximum Layer 2 failure domains during new-building network approvals” would remedy that alternative situation, but it would not correct the present issue: ordinary directed and local broadcasts do not automatically cross routed boundaries, so an explicit authorized delivery design is required.

“Align MAC limit exceptions with phones, hypervisors and other genuine multi-MAC endpoints” is the supported response when without port security or identity-aware access control, a simple access port may learn multiple endpoint MAC addresses without limitation. Here the decisive response is “Document WoL security and relay dependencies when redesigning campus routing and NAC controls”, so that different intervention does not meet the stated requirement.

EtherChannel members need compatible Layer 2 settings and negotiated bundling state to represent a correct logical link. “Audit allowed VLANs and link settings at both ends when adding or replacing bundle members” applies to that other condition. The reported evidence is an enterprise wants remote Wake-on-LAN for sleeping workstations in many VLANs but the management tool sends only local Ethernet magic packets from a central server; 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: remote-only controller dependencies and insufficient regional capacity can degrade onboarding, resiliency and convergence at scale.

“Design approved branch egress security with local firewall, cloud security service or appropriate service chaining” is the supported response when local breakout bypasses central inspection unless equivalent secure edge controls and policy are deliberately placed. Here the decisive response is “Design supported regional controller and overlay architecture with redundancy, policy consistency and documented capacity limits”, 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 global SD-WAN fabric grows across continents but keeps every edge tied to a distant single control region, causing instability during regional carrier outages; this alternative would address the wrong dependency.

Policing enforces a rate by dropping or remarking excess packets, whereas shaping ordinarily smooths outbound bursts using buffers. “Document burst tolerance and discard implications when choosing policing or shaping for each class” 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.

“Audit QoS trust maps when onboarding new endpoint types or enabling unmanaged switch ports” is the supported response when trusting unvalidated endpoint DSCP markings allows unauthorized traffic to consume preferential network resources. Here the decisive response is “Evaluate per-flow state, class counts and provider behavior before committing to any QoS architecture”, so that different intervention does not meet the stated requirement.

An oversized or unbounded strict-priority queue can consume interface capacity and deny adequate service to other classes. “Review queue bandwidth guarantees and peak-rate policing as service demand changes” 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.

A single endpoint map/control-plane service is a common-mode availability risk even with redundant data-plane links. “Model controller and node availability separately from physical fabric underlay paths” 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.

“Document platform-specific multicast scalability and multicast-versus-unicast replication tradeoffs” is the supported response when fabric overlay multicast support and replication design have specific control and data-plane requirements beyond simple underlay multicast reachability. Here the decisive response is “Monitor identity-policy synchronization and handle unknown or unauthenticated endpoint roles explicitly”, 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. “Use virtual-network boundaries for real routing isolation and review any exception-based cross-VN reachability” 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.

IP reachability does not imply that IKE versions, cryptographic proposals, identities and authentication settings agree across peers. “Track cryptographic algorithm and lifetime standards jointly across every VPN peer lifecycle” would remedy that alternative situation, but it would not correct the present issue: traditional point-to-point encryption tunnel meshes may add unnecessary topology and scale complexity for a trusted private routed underlay.

“Reconcile cloud subnet additions with tunnel selectors and routing changes before declaring VPN rollout complete” is the supported response when VPN session status can be healthy while mismatched crypto ACLs or traffic selectors omit the application flow. Here the decisive response is “Treat key server redundancy, rekey windows and group membership security as critical design dependencies”, so that different intervention does not meet the stated requirement.

Tenant route separation blocks cross-VPN reachability until carefully controlled route-target import/export rules make the intended service available. “Review route target overlaps and firewall rules together when allowing cross-VPN shared services” applies to that other condition. The reported evidence is a corporate private MPLS WAN needs IP payload confidentiality across many sites without forcing ordinary site-to-site traffic through a tunnel hub; this alternative would address the wrong dependency.

IP-prefix ACLs become brittle when identity and endpoint groups move, while fabric policy can use scalable group-based classification. “Use authorized scalable group tags and matching group-based access policy integrated with the intended identity service” would remedy that alternative situation, but it would not correct the present issue: security group policy alone may not replace full virtual-network level route isolation where separate macrosegments are required.

“Integrate the fabric with appropriate Cisco ISE identity policy and validated endpoint profiling or authentication flows” is the supported response when identity group classification requires a trusted policy source and onboarding process rather than arbitrary address-based role guessing. Here the decisive response is “Design distinct fabric virtual networks with appropriate external borders and tightly defined shared services”, so that different intervention does not meet the stated requirement.

Fabric overlay multicast support and replication design have specific control and data-plane requirements beyond simple underlay multicast reachability. “Select a supported SD-Access multicast forwarding model and test receivers across fabric edges and virtual networks” applies to that other condition. The reported evidence is a finance and guest population share the same fabric virtual network even though compliance requires independent routing tables and external access paths; this alternative would address the wrong dependency.

A BGP TCP session does not automatically negotiate or advertise every address family without appropriate capabilities and policy. “Enable intended IPv6 unicast AFI/SAFI activation, reachable next hops and export filtering consistently on peers” would remedy that alternative situation, but it would not correct the present issue: default broadcast OSPF network behavior can elect designated routers even when the topology is only a two-router link.

“Deploy supported BFD for the intended OSPF peers, validate timers against platform capacity and test false-positive risk” is the supported response when layer 1 carrier state may not reveal a downstream path failure and slow neighbor detection extends blackhole time. Here the decisive response is “Use supported point-to-point OSPF network type consistently on both sides where the physical design permits”, so that different intervention does not meet the stated requirement.

Unrestricted BGP export policy exposes destinations not authorized for upstream announcement and risks routing leaks. “Apply explicit approved outbound prefix filters at the eBGP boundary and validate maximum prefix expectations” applies to that other condition. The reported evidence is a point-to-point Ethernet transport has only two routers, but operations wants to avoid unnecessary DR/BDR behavior from a broadcast network type; this alternative would address the wrong dependency.

That change concerns nat64 dns64 ipv6-only application access, where IPv6-only clients cannot communicate with IPv4-only services without supported translation and suitable destination synthesis. The reported issue instead stems from: Translation adds stateful dependencies and application edge cases that may be unnecessary when a controlled native dual-stack phase is viable.

That change concerns ipv6 overlay mtu and pmtud, where Overlay headers reduce usable path MTU and blocked ICMPv6 Packet Too Big feedback can prevent Path MTU Discovery. In this question the necessary remedy is “Select native dual stack for capable segments and reserve translation for real IPv4-only boundaries with documented requirements”, which this alternative does not provide.

That change concerns ipv6 security policy parity, where IPv4-only security rules do not automatically enforce the same trust boundary for IPv6 traffic on a dual-stack path. The observed condition is a migration team proposes full NAT64 for an entire enterprise even though most applications and WAN devices already support IPv6 and IPv4 simultaneously; this mechanism addresses another problem.

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: policing enforces a rate by dropping or remarking excess packets, whereas shaping ordinarily smooths outbound bursts using buffers.

“Revalidate shaping rates against provider CIR and accounting overhead after circuit or device changes” is the supported response when a high-speed physical port does not imply equal committed service rate, so uncontrolled bursts can be discarded in the provider network. Here the decisive response is “Document burst tolerance and discard implications when choosing policing or shaping for each class”, so that different intervention does not meet the stated requirement.

Per-flow IntServ state scales differently from aggregated DiffServ classes and can become operationally expensive for large multi-site deployments. “Evaluate per-flow state, class counts and provider behavior before committing to any QoS architecture” applies to that other condition. The reported evidence is a design uses aggressive ingress policing for interactive video and expects the policer to buffer all bursts until bandwidth becomes available; this alternative would address the wrong dependency.

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 reported issue instead stems from: An MPLS Layer 3 VPN routes IP among separated CE networks rather than delivering a transparent Layer 2 Ethernet service.

That change concerns metro ethernet multi site scaling, where Multipoint Ethernet services and many independent E-Line circuits have different Layer 2 forwarding and spanning-tree implications. In this question the necessary remedy is “Choose an eligible provider Layer 2 VPN or Ethernet private line design if extending a broadcast domain is genuinely required”, which this alternative does not provide.

That change concerns mpls layer 3 vpn tenant separation, where A shared provider routing domain cannot preserve independent overlapping tenant address spaces and route targets without isolation. The observed condition is a retailer wants two facilities to operate on one Ethernet broadcast domain across a managed provider network, but its proposed ordinary routed MPLS L3VPN does not transport Ethernet frames; this mechanism addresses another problem.

That change concerns eigrp unequal cost traffic sharing, where EIGRP unequal-cost load sharing is not enabled simply because multiple routes exist and is constrained by feasibility and variance. The reported issue instead stems from: Uncontrolled bidirectional redistribution can reintroduce routes, create loops and lose source-of-truth route preference.

That change concerns eigrp feasible successor requirements, where An EIGRP feasible successor must satisfy its feasibility condition relative to the successor's feasible distance to prevent loops. In this question the necessary remedy is “Use explicit tag-based redistribution policy, defined metrics and directional filters at well-documented borders”, which this alternative does not provide.

That change concerns eigrp authentication mismatched key chain, where Neighbor authentication parameters and permitted key windows must align or the routing protocol rejects peer messages. The observed condition is two autonomous branch EIGRP routing domains redistribute into one core and begin sending learned routes back into the origin domain; this mechanism addresses another problem.