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300-420 Pass4sure Pass Guide & 300-420 Exam Score

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Cisco 300-420 Exam is a challenging exam that requires extensive preparation. Candidates must have a good understanding of network design concepts and be familiar with Cisco technologies and products. To prepare for the exam, candidates can take advantage of Cisco's training and certification programs, which include classroom training, online courses, and self-study resources.

Cisco Designing Cisco Enterprise Networks Sample Questions (Q453-Q458):

NEW QUESTION # 453

Refer to the exhibit. Area 10 is a regular OSPF area and networks 10.1.1.0/24 and 172.16.1.0/24 are internal.
Which design provides optimal routing between both networks when the link between routers C and E fails?

A. Create an OSPF virtual link between routers E and F.
B. Create a tunnel between routers E and F in area 10.
C. Make area 10 a not-so-stubby area.
D. Move the link between routers C and D to area 10.

Answer: D

NEW QUESTION # 454

Refer to the exhibit. The full EIGRP routing table is advertised throughout the network. Currently, users experience data loss when any one link in the network fails. An architect optimizes the network to reduce the impact when a link fails. Which solution should the architect include in the design?

A. Summarize the access layer networks from the aggregation layer toward the core layer.
B. Reduce the default EIGRP hello interval and hold time.
C. Run BFD on the inter links between EIGRP neighbors.
D. Summarize the access layer networks from each access layer switch toward the aggregation layer.

Answer: C

Explanation:
Running BFD between EIGRP neighbors is the appropriate design when the problem is traffic loss during link failure and the requirement is to reduce the impact of the failure. EIGRP can detect neighbor loss through its hello and hold timers, but those timers may not be fast enough for applications sensitive to packet loss.
Bidirectional Forwarding Detection provides rapid failure detection independent of the routing protocol's normal timer expiration. When BFD detects a failed forwarding path, it notifies EIGRP so the routing process can converge without waiting for the EIGRP hold timer. Summarization is still a valuable scaling technique, but it primarily reduces route table size and query scope; it does not directly accelerate failure detection on an individual inter-router link. Reducing EIGRP hello and hold timers can improve detection, but it increases control-plane load and is less efficient than BFD. The question emphasizes data loss when any one link fails, so fast failure detection is the best corrective design. Reference topics: EIGRP convergence, BFD, failure detection, hello and hold timers, routed-link resiliency.

NEW QUESTION # 455
Refer to the exhibit. A network engineer is designing an OSPF solution to connect a company's remote to a newly provisioned MPLS VPN backbone. Some of the branches have a direct dark fiber connection between each other. The engineer wants to ensure that the dark fibers are used only when the MPLS core is unavailable. Which solution must the engineer choose?

A. NSSA
B. Stub area
C. Virtual link
D. Sham link

Answer: D

Explanation:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/xe-16/iro-xe-16- book/iro-sham-link.html

NEW QUESTION # 456
Which function are fabric intermediate nodes responsible for in an SD-Access Architecture?

A. transporting IP packets between edge nodes and border nodes
B. mapping EIDs to RLOCs
C. encapsulating user traffic in a VXLAN header including the SGT
D. registering new endpoints in the HTDB

Answer: A

NEW QUESTION # 457
Which feature is used to optimize WAN bandwidth of IGMP network traffic among WAN Edge routers in the same VPN?

A. multicast RP
B. multicast service routes
C. multicast-replicator
D. IGMPv2

Answer: C

Explanation:
https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/bridging-routing- segmentation-qos/vedge/bridging-routing-segmentation-qos-book/multicast-overlay-routing.html Replicators For efficient use of WAN bandwidth, strategic vEdge routers can be deployed and configured as replicators throughout the overlay network. Replicators mitigate the requirement for an ingress router to replicate a multicast stream once for each receiver.

NEW QUESTION # 458
......

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