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Cisco 300-420 (Designing Cisco Enterprise Networks) certification exam is a highly respected certification program that is designed to test the knowledge and skills of networking professionals in designing and implementing enterprise networks. 300-420 exam is challenging, but with the right preparation and study, candidates can pass the exam and earn the certification, which can help advance their career in the field of networking.
To successfully pass the Cisco 300-420 Certification Exam, candidates must have a solid understanding of Cisco enterprise network design principles, including network topology, routing protocols, and network security. Additionally, candidates must have hands-on experience with Cisco technologies, including Cisco DNA Center, virtualization technologies, and network automation tools. 300-420 exam consists of multiple-choice questions, simulations, and drag-and-drop exercises, and candidates are required to demonstrate their expertise in designing enterprise networks using Cisco technologies. Upon passing the exam, candidates will earn the Cisco Certified Design Professional (CCDP) certification, which is recognized globally as a symbol of expertise in enterprise network design.
NEW QUESTION # 191
An enterprise customer has these requirements:
- end-to-end QoS for the business-critical applications and VoIP
services based on CoS marking.
- flexibility to offer services such as IPv6 and multicast without any
reliance on the service provider.
- support for full-mesh connectivity at Layer 2.
Which WAN connectivity option meets these requirements?
- A. VPLS
- B. VPWS
- C. DMVPN
- D. MPLS VPN
Answer: A
Explanation:
VPLS provides full mesh connectivity at Layer 2. Cos marking will be kept in the frames because it transits on layer 2 network.
NEW QUESTION # 192
How are wireless endpoints registered in the HTDB in a Cisco SD-Access architecture?
- A. Fabric APs update the HTDB with the clients' ElD and RLOC
- B. Fabric WLCs update the HTDB as new clients connect to the wireless network
- C. Fabric edge nodes update the HTDB based on CAPPWAP messaging from the AP
- D. Border nodes first register endpoints and then update the HTDB
Answer: B
Explanation:
NEW QUESTION # 193
An organization is designing a detailed QoS plan that limits bandwidth to specific rates. Which two parameters are supported be the traffic policing feature? (Choose two.)
- A. marking
- B. bursting
- C. shaping
- D. conforming
- E. violating
Answer: D,E
Explanation:
Explanation
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_plcshp/configuration/xe-3s/qos-plcshp-xe-3s-book/qos-p
NEW QUESTION # 194
An architect is designing a network that will utilize the spanning tree protocol to ensure a loop-free topology. The network will support an engineering environment where it is necessary for end users to connect their own network switches for testing purposes. Which feature should the architect include in the design to ensure the spanning tree topology is not affected by these rogue switches?
- A. BPDU guard
- B. loop guard
- C. BPDU Skew Detection
- D. root guard
Answer: D
NEW QUESTION # 195
When a network is designed using IS-IS protocol, which two circuit types are supported? (Choose two.)
- A. nonbroadcast multiaccess
- B. point-to-point
- C. point-to-multipoint
- D. multiaccess
- E. nonbroadcast
Answer: B,D
Explanation:
Section: Advanced Addressing and Routing Solutions
NEW QUESTION # 196 
Refer to the exhibit. An engineer is designing a BGP solution for a client that peers with ISP1 for full Internet connectivity and with ISP2 for direct exchange of routes for several third parties. Which action, when implemented on the edge routers, enables the client network to reach the Internet through ISP1?
- A. Run an eBGP session within different VRFs for each ISP.
- B. Advertise a default route for downstream routers within the client network.
- C. Apply the AS-path prepend feature for ISP2.
- D. Apply route filtering such that the client advertises only routes originated from its own AS.
Answer: B
NEW QUESTION # 197
Which method does Cisco SD-WAN use to avoid fragmentation issues?
- A. Access circuits are configured with 1600 byte MTU settings.
- B. Traffic is marked with the DF bit set.
- C. PMTUD is used.
- D. Jumbo frames are enabled.
Answer: C
Explanation:
Explanation
https://www.cisco.com/c/dam/en/us/solutions/collateral/enterprise-networks/sd-wan/nb-06-cisco-sd-wan-ebook-c
NEW QUESTION # 198
Refer to the exhibit.
Refer to the exhibit. The distribution switches serve as the layer 3 boundary. HSRP preemption is enabled. When the primary switch comes back after a failure, traffic is initially dropped. Which solution must be implemented to improve the design?
- A. Configure a higher mac-refresh interval on both HSRP devices
- B. Use the preempt delay feature on the backup HSRP device
- C. Increase the hello timers on both HSRP devices
- D. Use the preempt delay feature on the primary HSRP device.
Answer: D
NEW QUESTION # 199 
Refer to the exhibit. An engineer proposed this solution for a company that requires a loop-free. Layer 2 network design. The network will run 802.1W, and all links will be 1 Gbps. If all interfaces are up as point- to- point adjacencies, what are the expected port end states based on the design?
- A. Eth1/3 on SW2 and SW3 will be m an Attn BLK state
- B. Eth1/2 on SW3 and SW4 will be m an Attn BLKbtate.
- C. Eth1/1 on SW1 and SW2 will be in a Root FWD state.
- D. Eth1/2 on SW2 and SW3 will be in a Desg FWD state
Answer: B
NEW QUESTION # 200
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?
- A. Queuing
- B. Policer with markdown
- C. Policing
- D. Traffic shaping
Answer: D
Explanation:
Explanation
https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/19645-policevsshape.html Traffic shaping limits the rate of traffic that is sent or received over a network connection by buffering and delaying the flow of data packets. This will help to ensure that the customer is not exceeding the 100Mbps CIR that the ISP has set and also prevent the aggressive dropping of traffic. Traffic shaping will also help to maximize the bandwidth usage while still staying within the limits of the CIR.
NEW QUESTION # 201
Which node performs the LISP Map-Server and Map-Resolver functions in the Cisco SD-Access network architecture?
- A. control plane node
- B. fabric edge node
- C. border node
- D. intermediate node
Answer: A
NEW QUESTION # 202
Drag and drop the elements from the left onto the YANG models where they and used on the right.
Answer:
Explanation:
Explanation
Diagram Description automatically generated
NEW QUESTION # 203
An engineer is designing a PIM Anycast RP solution between two data centers. The design must ensure that RP1 in DC1 and RP2 in DC2 inform each other about specific sources that have joined locally. Which solution must the engineer choose?
- A. Enable MSDP between RPs using separate unique loopback interfaces
- B. Provision the RPs on the same IP subnet and extend the subnet at Layer 2 between data centers
- C. Enable MSDP between RPs using the configured Anycast RP address
- D. No action is required because PIM registers from the source will, by default, reach each RP
Answer: A
NEW QUESTION # 204
Refer to the exhibit.
An engineer is designing a routing solution for a customer. The design must ensure that a failure of network
10.1.0.0/24, 10.1.2.0/24, 10.2.1.0/24, or 10.2.3.0/24 does not impact the core. It also requires fast convergence time during any link failover in the core or access networks. Which solution must the engineer select?
- A. Add aggregation layer between core and access networks.
- B. Enable summarization on routers A and C.
- C. Enable FRR for the connected networks of routers A and C.
- D. Enable graceful restart on routers A and C.
Answer: C
NEW QUESTION # 205
Refer to the exhibit. A company specializing in VoD content creation has two offices in a separate multicast domain connected by a WAN link. BGP communication has been established between the offices. Clients are inside the LAN in each office. In AS5373, R2 has been selected as RP.
What must the network architect design to deliver VoD content to clients in AS65773?
- A. MSDP
- B. PIM ASM with Auto-RP
- C. PIM ASM with BSR
- D. PIM SSM
Answer: A
NEW QUESTION # 206 
Refer to the exhibit. An architect is designing a hierarchical ISIS solution for a customer with these requirements:
* Routers will double In all areas within the next 24 months.
* Link flaps within areas 20 and 30 must not impact the backbone area.
* Traffic originating from A201 and A302 routers must connect to application servers in the backbone.
Which design must the architect select?
- A. C102 Level 2. A202 Level 2, and A102 Level 1
- B. C101 Level 1/2. A201 Level 1, and A101 Level 2
- C. C201 Level 1/2, A301 Level 1/2 and A102 Level 1/2
- D. C302 Level 2. A302 Level 1/2. and A101 Level 2
Answer: C
NEW QUESTION # 207
Refer to the exhibit. An architect must create a stable and scalable EIGRP solution for a customer. The design must:
- conserve bandwidth, memory, and CPU processing
- prevent suboptimal routing
- avoid any unnecessary queries
Which two solutions must the architect select? (Choose two.)
- A. Stub routing
- B. Route summarization
- C. Prefix lists
- D. Static redistribution
- E. Distribute lists
Answer: A,B
Explanation:
The EIGRP stub routing feature provides four advantages when implemented in hub-and-spoke networks;
* It prevents sub-optimal routing from occurring within hub-and-spoke EIGRP networks
* It prevents stub routers with low-speed links from being used as transit routers
* It eliminates EIGRP Query storms, allowing the EIGRP network to convergence faster
* It reduces the required amount of configuration commands on the stub routers
NEW QUESTION # 208
An engineer is creating a design to enable IPv6 to run on an existing IPv4 IS-IS network. The IPv4 and IPv6 topologies will match exactly, and the engineer plans to use the same router levels for each protocol per interface. Which IS-IS design is required?
- A. single topology with transition feature enabled
- B. multi topology with transition feature enabled
- C. multi topology without enabling transition feature
- D. single topology without enabling transition feature
Answer: D
Explanation:
Both IPV4 and IPV6 are sharing the exact same topology. No need of multipology nor transition mode:
https://www.ws.afnog.org/afnog2011/are/ipv6-presentations/4-isis-for-ipv6.pdf
NEW QUESTION # 209
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