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| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Designing Cisco Enterprise Networks |
| Exam Number: | 300-420 ENSLD |
| Exam Format: | Multiple choice, Scenario-based, Simulations, Drag-and-drop |
| Real Exam Qty: | 55โ65 |
| Available Languages: | Japanese, English |
| Related Certifications: | Cisco Certified Specialist โ Enterprise Design Cisco Certified Network Professional (CCNP) Enterprise |
| Exam Price: | USD 400 |
| Certificate Validity Period: | 3 years |
| Passing Score: | Pass/Fail |
| Exam Duration: | 90 minutes |
| Recommended Training: | Designing Cisco Enterprise Networks (ENSLD) Official Training |
| Exam Registration: | Pearson VUE Cisco Official Registration |
| Sample Questions: | Cisco 300-420 Sample Questions |
| Exam Way: | Online proctored or in-person at authorized test centers |
| Pre Condition: | Recommended: Implementing and Operating Cisco Enterprise Network Core Technologies (350-401 ENCOR) or equivalent knowledge |
| Official Syllabus URL: | https://www.cisco.com/c/en/us/training-events/training-certifications/exams/current-list/ensld-300-420.html |
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Cisco 300-420 exam, also known as the Designing Cisco Enterprise Networks (ENSLD) exam, is an important certification that validates the skills and knowledge of network professionals in designing and implementing complex enterprise network solutions. 300-420 Exam is designed to test the candidates' understanding of various network design principles, architectures, and technologies, including advanced routing and switching protocols, security, wireless, and virtualization.
NEW QUESTION # 241 
Refer to the exhibit. An architect must design an IP addressing scheme for a multisite network connected via a WAN transit. The campus site must accommodate 12,000 devices and the branch sites must accommodate
1,000 devices. Which address scheme optimizes network device resources, contains convergence events to the different blocks of the network, and ensures future growth of the network?
* * Campus: 10.0.0.0/18
* Branch1: 10.0.192.0/21
* Branch2: 10.0.200.0/21
* * Campus: 10.0.0.0/16
* Branchi: 10.255.0.0/20
* Branch2: 10.255.16.0/20
* * Campus: 10.0.0.0/10
* Branch1: 10.64.0.0/10
* Branch2: 10.128.0.0/10
* * Campus: 10.0.0.0/20
Answer: B
NEW QUESTION # 242
An engineer must design a QoS solution for a customer. The network currently supports data only, but the customer will roll out VoIP and IP video in conjunction with the new QoS solution. The engineer plans to use DiffServ. To ensure priority for voice services, which model must the design include?
Answer: A
Explanation:
The 8-class QoS model is the appropriate DiffServ design when an enterprise is adding voice and video to an existing data network and needs priority treatment for voice. Cisco enterprise QoS designs commonly evolve from a simple data-only model to a multi-class model that separates routing/control, voice bearer, video, signaling, transactional data, bulk data, scavenger traffic, and default traffic. This separation is important because voice requires strict low latency, low jitter, and minimal loss, while video usually requires guaranteed bandwidth but must not starve voice or network control traffic. A 4-class model can be too coarse when both VoIP and IP video are introduced because it often collapses distinct traffic types into broad queues. A 12-class model may be appropriate for very mature or complex environments, but it is more operationally demanding.
The 6-class model can work in some cases, but the common Cisco campus and WAN baseline for mixed voice, video, and data is the 8-class model. Reference topics: DiffServ QoS, enterprise QoS class models, voice priority queue, video classification, DSCP design.
NEW QUESTION # 243
Exhibit:
Answer: C
Explanation:
R3 must be made an L1/L2 router so that it can connect the Level 1 area to the Level 2 backbone. IS-IS uses a two-level hierarchy. Level 1 routers know the topology inside their local area, Level 2 routers form the backbone between areas, and Level 1/Level 2 routers provide the boundary between the two. A proper IS-IS backbone cannot have isolated Level 1-only routers positioned between L1/L2 routers that need to exchange interarea reachability. If the link failure exposed an area-continuity problem, converting R3 to L1/L2 gives the area an appropriate attachment point to the backbone and restores interarea forwarding behavior. Making an unrelated router Level 1 or Level 2 only would not necessarily create the required boundary function. Simply making Area 0 L2-only is also not the focused fix if the topology still lacks a correct L1/L2 transition point.
The design principle is straightforward: every Level 1 area must have a dependable L1/L2 router through which traffic can reach destinations outside the area. Reference topics: IS-IS Level 1, Level 2 backbone, L1
/L2 routers, interarea reachability, hierarchical IGP design.
NEW QUESTION # 244 
Refer to the exhibit. An architect designed a BGP routing solution to reduce the number of IBGP peerings to conserve resources. The original design had a total of 36 IBGP peerings. The new design reduces the number of peerings by how many?
Answer: D
Explanation:
The new BGP route-reflector design reduces the iBGP peerings by 27. A full-mesh iBGP design with 9 routers requires n times n minus 1 divided by 2 peerings, which equals 9 times 8 divided by 2, or 36 sessions.
Route reflectors are used specifically to reduce this scaling burden. In the redesigned topology, each of the three clusters has one route reflector and two clients, which requires two client-to-reflector sessions per cluster, or six sessions total. The three route reflectors must still maintain iBGP sessions with one another as nonclient peers, which adds three more sessions. The redesigned total is therefore nine sessions. The reduction is 36 minus 9, which equals 27. This reflects the core scaling benefit of route reflectors: clients no longer need a full iBGP mesh with every other client in the autonomous system. Reference topics: BGP route reflectors, iBGP scaling, full-mesh formula, route-reflector clients, nonclient peering.
NEW QUESTION # 245
An engineer is designing a network for a customer running a wireless network with a common VLAN for all APs. The customer is experiencing unicast flooding in the Layer 2 network between the aggregation and access layers. The customer wants to reduce the flooding and improve convergence time. Which solution meets these requirements?
Answer: C
Explanation:
Because the wireless access points must remain in a common VLAN, the practical design is to align the HSRP active gateway with the spanning-tree root bridge for that VLAN. Unicast flooding commonly occurs when a Layer 2 domain is stretched between aggregation and access layers and the traffic path becomes asymmetric. If the HSRP active gateway is on one aggregation switch while STP forwards the Layer 2 path through a different aggregation switch, return traffic can be forced across inter-switch links and CAM table aging can create flooding conditions. Cisco campus design guidance emphasizes aligning Layer 2 and Layer 3 forwarding roles so the active default gateway and spanning-tree root are colocated for each VLAN.
Migrating to routed access is usually the best long-term design, but it requires the APs to run on separate VLANs; the question states they use a common VLAN. Reducing ARP timers to match CAM timers can help some flooding cases, but it is not the core design fix offered here. Reference topics: HSRP and STP alignment, unicast flooding, Layer 2 campus design, wireless AP VLAN design.
NEW QUESTION # 246
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