Pass Guaranteed Quiz 2026 Cisco 300-420: Designing Cisco Enterprise Networks Latest Reliable Test Notes

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Cisco 300-420 Exam Syllabus Topics:

SectionWeightObjectives
Services10%- Design network management
- Design end-to-end QoS policy
Enterprise Campus Security20%- Design network access control
- Design network security
Advanced Addressing and Routing Solutions25%- Create structured addressing designs
- Determine IPv6 migration strategy
- Create stable, secure, and scalable routing designs for Layer 3
WAN for Enterprise Networks20%- Design SD-WAN solution
- Design QoS for WAN
- Design WAN connectivity
Advanced Enterprise Campus Networks25%- Design Layer 2 and Layer 3 campus networks
- Design campus network services (QoS, multicast, etc.)
- Design for high availability

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Cisco Designing Cisco Enterprise Networks Sample Questions (Q21-Q26):

NEW QUESTION # 21
Refer to the exhibit. An engineer must design an address translation solution to provide internet connectivity for the corporate network. The design is restricted to the 172.16.168.0/22 subnet.
Which solution must the engineer choose?

Answer: A


NEW QUESTION # 22
A client is moving to Model-Driven Telemetry and requires periodic updates. What must the network architect consider with this design?

Answer: A

Explanation:
For model-driven telemetry with periodic updates, the architect must understand that each periodic update sends the subscribed data at the configured interval. Cisco telemetry guidance distinguishes periodic subscriptions from on-change subscriptions. A periodic subscription streams a full copy of the subscribed data element or table at each interval, even if the underlying state has not changed. That behavior is useful when the collector needs regular time-series samples, trending, or baseline monitoring, but it creates predictable bandwidth and collector-load requirements. On-change subscriptions are different: they publish updates when the subscribed state changes and are more efficient for state changes such as interface status, memory thresholds, or protocol adjacency m ovement. Empty subscription behavior and initial update timing may matter in specific implementations, but they are not the main design consideration in this question. Since the customer requires periodic updates, the design must size the transport, collector, retention system, and subscription intervals around repeated full data delivery. Reference topics: model-driven telemetry, periodic subscription, on-change subscription, YANG-modeled operational data, collector sizing.


NEW QUESTION # 23
Mobile service provider "A" is going to launch 5G support with the ISP "B" IP network backbone as the underlay transport. Conversational traffic type will be marked with expedited forwarding class, streaming services will be marked with assured forwarding 2 class, and web browsing will be marked with assured forwarding 3 class. Which QoS model meets these requirements if the solution is to be implemented end to end on the ISP_B backbone network?

Answer: A

Explanation:
The correct model is a 4-class QoS strategy with DiffServ. The traffic classes listed in the question are explicitly DiffServ per-hop behaviors: Expedited Forwarding for conversational traffic, Assured Forwarding class 2 for streaming, and Assured Forwarding class 3 for web or interactive traffic. Cisco QoS guidance uses DiffServ to classify and mark traffic with DSCP values, then apply per-hop behavior at each node along the path. This gives scalable end-to-end treatment across a provider backbone without maintaining per-flow reservations. The four service treatments implied are conversational, streaming, interactive/web, and background or best effort, which matches the stated service categories without unnecessary class expansion.
IntServ is not appropriate for an ISP backbone because it uses RSVP-style per-flow signaling and state, which scales poorly compared with DiffServ PHB handling. The 8-class and 12-class options add complexity beyond the stated mappings. Reference topics: DiffServ, DSCP, EF, AF2, AF3, per-hop behavior, provider QoS design.


NEW QUESTION # 24
Drag and drop the elements from the left onto the functions they perform in the Cisco SD-WAN architecture on the right.

Answer:

Explanation:


NEW QUESTION # 25
A customer's current Layer 2 infrastructure is running Spanning Tree 802.1d, and all configuration changes are manually implemented on each switch. An architect must redesign the Layer 2 domain to achieve these goals:

Answer: A,B

Explanation:
Which two solutions should the architect include in the new design? (Choose two.) Implement Rapid PVST+ instead of STP.
Implement MST instead of STP.
Use VTP to propagate VLAN information and to prune unused VLANs.
Configure broadcast and multicast storm control on all switches.
Configure dynamic trunking protocol to propagate VLAN information.


NEW QUESTION # 26
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