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Cisco 300-420 Exam Syllabus Topics:

Section	Weight	Objectives
WAN for Enterprise Networks	20%	- WAN connectivity options 1. MPLS, Metro Ethernet, 4G/5G 2. SD-WAN architecture and design - WAN resiliency and high availability - VPN design 1. Site-to-site VPN 2. DMVPN, L2VPN, L3VPN
Advanced Enterprise Campus Networks	25%	- Layer 3 campus design 1. Virtualization and segmentation 2. Routing in campus infrastructure - Wireless integration - Layer 2 campus design 1. Hierarchical architecture 2. Spanning Tree Protocol optimization 3. VLAN and trunking design
Security Services	10%	- Security architecture design 1. Network segmentation 2. Threat defense integration - Secure connectivity
Network Services	15%	- Quality of Service (QoS) 1. Policing, shaping, congestion management 2. Classification and marking - IP services 1. DHCP, DNS, NAT - Multicast design
Advanced Addressing and Routing Solutions	25%	- IPv4 and IPv6 addressing design 1. Route summarization and aggregation 2. Structured addressing plans - Routing protocol design 1. OSPF design 2. IS-IS design 3. EIGRP design 4. Route redistribution and filtering
Software-Defined Access (SDA)	5%	- SD-Access architecture - Control plane and data plane design - Fabric design and deployment

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Cisco Designing Cisco Enterprise Networks Sample Questions (Q186-Q191):

NEW QUESTION # 186
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. Summarize the access layer networks from each access layer switch toward the aggregation layer
C. Run BFD on the inter links between EIGRP neighbors.
D. Reduce the default EIGRP hello interval and hold time

Answer: C

NEW QUESTION # 187
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?

A. Graceful-restart
B. Next-hop address tracking
C. Aggressive timers
D. BFD

Answer: D

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

NEW QUESTION # 188
Refer to the exhibit. A network engineer with an employee ID: 4433:77:420 must design a BGP solution based on these conditions:
- Traffic sessions occur between the branches and the data center.
- Branch B has limited resources to process routing updates.
- HQ must filter out all prefixes from branch A to R4.
Which outbound route filtering (ORF) solution must the engineer choose?

A. Use a prefix list with the 10.10.10.0/24 subnet for ORF on R5.
B. Use a prefix list with the 192.168.10.0/24 subnet for ORF on R2.
C. Use a prefix list with the 192.168.10.0/24 subnet for ORF on R4.
D. Use a prefix list with the 10.10.10.0/24 subnet for ORF on R2

Answer: D

NEW QUESTION # 189
Which design consideration must be made when using IPv6 overlay tunnels?

A. Overlay tunnels should only be considered as a transition technique toward a permanent solution.
B. Overlay tunneling encapsulates IPv4 packets in IPv6 packets for delivery across an IPv6 infrastructure.
C. Overlay tunnels that connect isolated IPv6 networks can be considered a final IPv6 network architecture.
D. Overlay tunnels can be configured only between border devices and require only the IPv6 protocol stack.

Answer: A

Explanation:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/xe-3s/ir-xe-3s-book/ip6-ip4-gre-tunls-xe.pdf

NEW QUESTION # 190
An architect is designing how the company will manage the infrastructure of a large data center. The company wants to group device types for security reasons and mitigate DoS attacks. The company also wants to ensure that access to the rest of the production network is not possible if one device is compromised on the management plane. Which solution must the architect choose?

A. out-of-band dial-up circuit
B. in-band Ethernet
C. in-band dial-up circuit
D. out-of-band Ethernet

Answer: D

Explanation:
Out-of-band Ethernet is the correct management design for a large data center when the customer wants device grouping, management-plane isolation, and reduced blast radius from compromise. In an out-of-band design, management traffic uses a physically or logically separate management network instead of traversing the production data plane. This allows different device classes to be placed into management zones, protected by access control, authentication, logging, and rate-limiting policies. If one managed device is compromised, the attacker should not automatically gain production network reachability through the management interface.
In-band Ethernet would share the production infrastructure and therefore would not provide the same isolation. Dial-up out-of-band access can be useful for emergency console access, but it is not appropriate as the primary management architecture for a large data center. Out-of-band Ethernet provides scale, speed, and segmentation while still allowing centralized management systems to reach routers, switches, controllers, and appliances. Reference topics: out-of-band management, management-plane security, data-center operations, isolation, access control, DoS mitigation.

NEW QUESTION # 191
......

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