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Cisco 300-420 Exam Syllabus Topics:

SectionObjectives
Network Services Design- Multicast and QoS design considerations
- Routing protocols design (OSPF, EIGRP, BGP)
Enterprise Campus Network Design- Campus LAN architecture
- Spine-leaf and hierarchical design models
Network Automation and Programmability- Controller-based networking design
- API-driven network automation concepts
Enterprise Network Design Principles- Scalability and high availability design
- Design methodologies and best practices
WAN and Edge Connectivity Design- Traditional WAN and internet edge design
- SD-WAN architecture and design considerations
Security Design in Enterprise Networks- Segmentation and access control design
- VPN and perimeter security architecture

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Cisco Designing Cisco Enterprise Networks Sample Questions (Q23-Q28):

NEW QUESTION # 23

Refer to the exhibit. A customer has two eBGP peerings from a single CE router toward two service providers. The customer has hired an architect to design a solution to ensure certain traffic enters the customer
' s network through interface g¡g0/0. Which solution must the architect include in the design?

Answer: B

Explanation:
Advertising more-specific prefixes toward the preferred service provider is the correct way to influence inbound traffic to enter through a chosen CE interface. BGP inbound path control is indirect: the enterprise cannot set local preference inside remote autonomous systems, and MED is honored only under specific provider policies. The most deterministic option available to the customer is to advertise a longer-prefix route to the preferred provider because Internet and BGP route selection generally prefer the longest matching prefix before BGP path attributes are considered. If the aggregate is advertised to both providers but a more- specific route is advertised to the provider connected to gig0/0, return traffic for that more- specific destination is attracted through that interface. Lowering MED toward the less preferred provider is the opposite of the desired effect. AS-path prepending toward the preferred provider would make that path less attractive. Local preference affects outbound path selection inside the local AS, not inbound traffic from external networks. Reference topics: BGP inbound traffic engineering, longest-prefix match, route aggregation, AS-path prepending, MED, local preference.


NEW QUESTION # 24
A company needs to increase access port capacity on one floor of a building. They want to leverage the existing catalyst access switch. There is no problem with uplink bandwidth capacity. However, no additional uplinks can be added because no ports are available on the distribution switches. Which solution must the company choose to provide additional access ports?

Answer: A


NEW QUESTION # 25
An engineer is designing an EIGRP network for a small branch site where there is only one Layer 3 router. The engineer wants the router to advertise the local LAN network to remote EIGRP neighbors without sending any unnecessary multicast messages on the local LAN. Which action should the engineer take?

Answer: B

Explanation:
Section: Advanced Addressing and Routing Solutions


NEW QUESTION # 26
Refer to the exhibit.

The failover time of ISP-2 is significantly shorter than ISP-1 when an interface on the ISP router toward the campus network fails. Which solution minimizes the downtime to the sub-second?

Answer: B

Explanation:
https://www.cisco.com/c/en/us/td/docs/ios/12_2sb/feature/guide/sbbnhop.html


NEW QUESTION # 27
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: D

Explanation:
BFD with default BGP timers is the best design choice because it improves failure detection without forcing BGP itself to run aggressive keepalive processing. Cisco documentation describes BFD as providing fast forwarding-path failure detection and notes that BFD can be less CPU-intensive than reduced EIGRP, BGP, and OSPF timers because parts of BFD can be distributed to the data plane. Lowering BGP keepalive and hold timers makes the BGP process detect failure sooner, but it increases control-plane activity and can create instability at scale. Tuning the BFD multiplier to an extreme value such as 50 is also counterproductive because it lengthens detection rather than improving it, depending on the interval used. The correct approach is to leave normal BGP timers in place and bind BGP neighbor fall-over to BFD. When the forwarding path fails, BFD notifies BGP quickly, allowing the route to be withdrawn and an alternate provider path to be selected faster without unnecessary BGP timer churn.


NEW QUESTION # 28
......

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