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Cisco 300-420 Exam is a challenging test that requires candidates to have a strong understanding of network design principles and technologies. To prepare for the exam, candidates should have experience designing and implementing enterprise networks using Cisco technologies. Candidates should also have a clear understanding of the exam objectives and the topics that will be covered on the exam.
NEW QUESTION # 155
When is it advisable to provide dedicated control plane nodes within a Cisco SD-Access design?
Answer: B
Explanation:
Dedicated control-plane nodes are advisable when frequent endpoint roaming across fabric edge nodes is expected. In Cisco SD-Access, the control-plane node maintains the host tracking database and resolves endpoint identifiers to routing locators. When endpoints move between fabric edge nodes, the fabric must update endpoint-to-location mappings quickly and consistently. In smaller deployments, the control-plane function can sometimes be colocated with border nodes, but larger or more mobile environments benefit from dedicated control-plane nodes to improve scale, resilience, and operational separation. The decision is not because Cisco DNA Center is absent; DNA Center is the management and automation platform for SD- Access. It is also not because edge nodes are unable to provide control-plane functionality, since that is not their fabric role. Frequent roaming creates more mapping updates and lookup activity, so dedicated control- plane resources help maintain stable endpoint registration and resolution performance. Reference topics:
Cisco SD-Access control-plane node, host tracking database, endpoint mobility, LISP map server, fabric scale.
NEW QUESTION # 156
An architect is designing a connectivity solution for a customer's two small branch offices. The customer wants a cost-effective design, no routing overhead, and some down time during the year is acceptable. Which connectivity solution must the architect choose?
Answer: D
NEW QUESTION # 157
Refer to the exhibit. An engineer must ensure that the QoS design guarantees bandwidth for the applications, and an application can request a particular type of service to support its delay requirements. Which solution must the engineer select?
Answer: A
Explanation:
The correct solution is IntServ with RSVP. The requirement says the application must be able to request a specific service level and receive guaranteed bandwidth with support for delay requirements. Cisco describes Integrated Services as a QoS model that uses Resource Reservation Protocol to signal per-flow resource requirements across the network. RSVP allows applications or endpoints to request bandwidth and delay treatment; each participating network device can admit or reject the reservation based on available resources.
This is exactly the behavior needed when an application must explicitly request a service profile rather than simply inherit a class marking. DiffServ with DSCP is more scalable, but it only marks traffic and applies class-based per-hop behavior. It does not provide per-flow reservation or allow the application to explicitly reserve resources. DSCP by itself is a marking mechanism, not a reservation protocol. RSVP belongs with IntServ in the classic QoS model. Reference topics: Integrated Services, RSVP, resource reservation, QoS guarantees, delay-sensitive applications.
NEW QUESTION # 158
Refer to the exhibit.
Which solution decreases the EIGRP convergence time?
Answer: D
NEW QUESTION # 159
What is the purpose of a control plane node in a Cisco SD-Access network fabric?
Answer: D
Explanation:
Explanation
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html
NEW QUESTION # 160
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