Exam 300-420 Study Guide - 300-420 Latest Study Questions

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Cisco 300-420 Exam

Designing Cisco Enterprise Networks v1.0 (ENSLD 300-420) design is a 90-minute related to CCNP Venture certification. This exam accredits a candidate's knowledge of business planning to follow and carry out advanced solutions, in business college networks, WAN, security services, network solutions and SDA. The course, Cisco Venture Design, Networking, help prospects prepare for this exam.

The Cisco 300-420 exam is intended for network engineers, network architects, and other IT professionals who are responsible for designing and implementing enterprise networks. It is a comprehensive exam that covers a wide range of topics, including network infrastructure, network security, network services, and network management.

Candidates who successfully pass the Cisco 300-420 Exam earn the CCDP certification, which is recognized globally and highly valued by employers. Designing Cisco Enterprise Networks certification validates the candidate's expertise in designing and implementing complex enterprise-level networks, enhancing their career opportunities and professional credibility.

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Cisco Designing Cisco Enterprise Networks Sample Questions (Q338-Q343):

NEW QUESTION # 338
A company with multiple service providers wants to speed up BGP convergence time in the event a failure occurs with their primary link. Which approach achieves this goal and does not impact router CPU utilization?

Answer: A


NEW QUESTION # 339

Refer to the exhibit. An architect reviews the low-level design of a company ' s enterprise network and advises optimizing the STP convergence time. Which functionality must be to Gi1/0/1-10 to follow the architect ' s recommendation?

Answer: D

Explanation:
PortFast is the correct functionality for the Gi1/0/1-10 interfaces when those ports are endpoint-facing access ports. Cisco spanning-tree design uses PortFast to allow edge ports to transition directly to the forwarding state, avoiding the normal listening and learning delay associated with traditional STP convergence. That improves user and endpoint connectivity after link-up events and is especially important for workstations, phones, printers, and access devices that should not participate in the Layer 2 topology. Root guard and BPDU guard are protection features, not the primary convergence optimization requested by the architect.
UplinkFast was used in older STP designs to accelerate recovery for access switches with redundant uplinks, but it is not the edge-port functionality for interfaces Gi1/0/1-10. In a modern design, PortFast should be enabled only on true host-facing ports, normally together with BPDU guard to protect against accidental switch attachment. If the exhibit shows these interfaces as end-user access ports, PortFast is the feature that follows the recommendation to optimize STP convergence time. Reference topics: STP PortFast, edge-port convergence, BPDU guard, Layer 2 campus design.


NEW QUESTION # 340
You are implementing WAN access for an enterprise network while running applications that require a fully meshed network, which two design standards are appropriate for such an environment? (Choose two)

Answer: A,D

Explanation:
With DMVPN phase 2 and 3, spokes can speak with each other directly like they are directly connected in a meshed network. This simplifies the connectivity for the enterprise -> Answer A is correct.
Another way to run applications that require a fully meshed network is through a WAN distribution layer that is connected to all remote sites. Therefore these sites can communicate with each other via this WAN distribution layer.


NEW QUESTION # 341

Refer to the exhibit. An architect designs a BGP policy for a customer that requires load sharing of the links that connect with the upstream service provider. The customer has these requirements: * The inbound traffic destined to network 10.1.1.0/24 must transit the R3-R1 link, and if the link fails, all inbound traffic must transit the R4-R2 link.
* The inbound traffic destined to network 10.1.2.0/24 must transit the R4-R2 link, and if the link fails, all inbound traffic should transit the R3-R1 link.
Which solution must the architect choose?

Answer: D

Explanation:
The correct policy is to prepend the AS path on the nonpreferred advertisement for each prefix. For inbound BGP traffic engineering, the enterprise normally influences remote autonomous systems by changing attributes that those systems see when selecting a path. AS-path prepending makes a route appear less attractive by adding repeated instances of the local AS number to the AS path. In this design, network 10.1.1.0
/24 should enter through R3-R1, so R2 must advertise that prefix with a prepended AS path to make the R4- R2 path less preferred unless the primary path fails. Conversely, network 10.1.2.0/24 should enter through R4- R2, so R1 must advertise that prefix with prepending to make the R3-R1 path less preferred. This creates inbound load sharing while preserving failover because the prepended route remains available as a backup.
Local preference affects outbound path selection inside the local AS, not inbound selection by the provider.
Reference topics: BGP traffic engineering, AS-path prepending, inbound path control, prefix-specific policy, multihomed WAN design.


NEW QUESTION # 342
An engineer is designing an IPv4 addressing plan for an enterprise with 1000 branches. Each branch requires a prefix for data and a prefix for voice. Each prefix must accommodate up to 128 hosts, and prefixes must facilitate summarization at aggregation points in the network. The security team requires a simple method for identifying voce prefixes. Which allocation does the engineer recommend from the RFC1918 address space?

Answer: D

Explanation:
Explanation
For example:
Site 0001
Data:10.0.0.0/24
Voice: 10.0.1.0/24
summary route : 10.0.0.0/23
Site 0002
Data:10.0.2.0/24
Voice: 10.0.3.0/24
summary route: 10.0.2.0/23
cont...
site 0129
Data:10.1.0.0/24
Voice: 10.1.1.0/24
summary route: 10.1.0.0/23
site 0130
Data:10.1.2.0/24
Voice: 10.1.3.0/24
summary route: 10.1.2.0/23
so 3rd octet is odd number assigned to voice, and even number assigned to data; for security team to recongize voice prefix, use an ACL with wildcast to filter odd number on third octet, started from 10.0.1.0 0.0.254.255, 10.1.1.0 0.0.254.255......, 10.1.1.0 0.0.254.255 etc; for 10.0.1.0 0.0.254.255, any IP in binary that started with 00001010.00000000.xxxxxxx1.xxxxxxxx will be matched (x = either 0 or 1), covert 3rd octet into dec, for example, 10000001 = 129 which is a voice VLAN.


NEW QUESTION # 343
......

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