300-420 Exam Actual Tests, 300-420 Exam Dumps Free

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Cisco 300-420 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Advanced Addressing and Routing Solutions25%- Determine IPv6 migration strategy
- Create structured addressing designs
- Create stable, secure, and scalable routing designs for Layer 3
Topic 2: Enterprise Campus Security20%- Design network security
- Design network access control
Topic 3: Advanced Enterprise Campus Networks25%- Design Layer 2 and Layer 3 campus networks
- Design for high availability
- Design campus network services (QoS, multicast, etc.)
Topic 4: WAN for Enterprise Networks20%- Design SD-WAN solution
- Design QoS for WAN
- Design WAN connectivity
Topic 5: Services10%- Design end-to-end QoS policy
- Design network management

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Cisco Designing Cisco Enterprise Networks Sample Questions (Q184-Q189):

NEW QUESTION # 184
An engineer must design a QoS solution for a customer that is connected to an ISP over a 1Gbps link with a 100Mbps CIR. The ISP aggressively drops all traffic received over which is causing numerous TCP retransmissions. The customer is not using any RTP applications but wants to maximize bandwidth usage up to the CIR. Which QoS solution engineer choose?

Answer: B

Explanation:
https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/19645- policevsshape.html


NEW QUESTION # 185
In PIM sparse mode, if an RPF check is successful on a multicast-enabled device, what happens to the multicast packet?

Answer: C

Explanation:
If the RPF check is successful in PIM sparse mode, the multicast packet is forwarded according to the outgoing interface list. The Reverse Path Forwarding check verifies that the packet arrived on the interface the router would use to reach the source, or the RP in the case of shared-tree state. This prevents loops and duplicate multicast forwarding. After the check passes, the router consults the multicast forwarding entry and sends the packet only out interfaces in the OIL where downstream receivers or PIM neighbors require the traffic. It is not automatically forwarded out every PIM-enabled interface, and it is not forwarded back out the receiving interface. If the RPF check fails, the packet is dropped to protect the multicast distribution tree. The OIL therefore represents the correct controlled forwarding behavior after a successful RPF validation.
Reference topics: PIM sparse mode, RPF check, outgoing interface list, multicast forwarding state, loop prevention.


NEW QUESTION # 186
An engineer uses Postman and YANG to configure a router with:
* OSPF process ID 400
* network 192.168.128.128/25 enabled for Area 0
Which get-config reply verifies that the model set was designed correctly?

Answer: B


NEW QUESTION # 187

Refer to the exhibit. Which two technologies must an engineer include in the design to prevent Layer 2 loops in this topology? Choose two.

Answer: A,D

Explanation:
The correct technologies are loop guard on uplinks and root guard on downlinks. Cisco campus Layer 2 design guidance recommends protecting the intended spanning-tree topology by placing root guard on ports where the root bridge should never appear and loop guard on non-designated ports that depend on receiving BPDUs. In a hierarchical topology, downlinks toward access switches should not be allowed to become a path to a new STP root; root guard enforces that design by moving a port to root-inconsistent state if a superior BPDU is received. Uplinks are vulnerable to failures where expected BPDUs stop arriving, which can cause an alternate or root port to incorrectly transition to forwarding. Loop guard prevents that by placing the port into loop-inconsistent blocking state. BPDU guard is not appropriate on normal interswitch uplinks or trunk downlinks because those links are expected to exchange BPDUs; it belongs mainly on PortFast edge ports.
Reference topics: STP protection, loop guard, root guard, campus Layer 2 design, Rapid PVST+.


NEW QUESTION # 188
Which three feature sets are used in Stackwise technology? (Choose three.)

Answer: C,E,F


NEW QUESTION # 189
......

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