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Cisco 300-420 exam, also known as Designing Cisco Enterprise Networks, is a certification exam that tests the knowledge and skills required to design enterprise-level networks. It is a professional-level exam that is intended for network architects, designers, and engineers with at least five years of experience in designing and implementing complex enterprise networks. 300-420 exam measures the candidate’s proficiency in design methodologies, wireless design, network services design, and security design.
NEW QUESTION # 158
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. Traffic shaping
- D. Policing
Answer: D
Explanation:
https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/19645-policevsshape.html
NEW QUESTION # 159
Which function are fabric intermediate nodes responsible for in an SD-Access Architecture?
- A. transporting IP packets between edge nodes and border nodes
- B. encapsulating user traffic in a VXLAN header including the SGT
- C. registering new endpoints in the HTDB
- D. mapping EIDs to RLOCs
Answer: A
Explanation:
Section: Advanced Enterprise Campus Networks
NEW QUESTION # 160
Drag and drop the characteristics from the left onto the configuration protocols they describe on the right.
Answer:
Explanation:
NEW QUESTION # 161
An infrastructure team is concerned about the shared memory utilization of a device, and for this reason, they need to monitor the device state. Which solution limits impact on the device and provides the required data?
- A. on-change subscription
- B. static telemetry
- C. periodic subscription
- D. IPFIX
Answer: A
Explanation:
Explanation
There are two types of subscriptions: periodic and on-change. With periodic subscription, data is streamed out to the destination at the configured interval. It continuously sends data for the lifetime of that subscription.
With on-change, data is published only when a change in the data occurs such as when an interface or OSPF neighbor goes down.https://developer.cisco.com/docs/ios-xe/#!streaming-telemetry-quick-start-guide/streaming-telemetry
NEW QUESTION # 162
Which two routing protocols allow for unequal cost load balancing? (Choose two.)
- A. BGP
- B. OSPF
- C. EIGRP
- D. IS-IS
- E. RIPng
Answer: B,C
Explanation:
Unequal cost load balancing is a feature that allows traffic to be distributed across unequal-cost paths to the same destination, which can increase network utilization and improve overall performance.
EIGRP (Enhanced Interior Gateway Routing Protocol) and OSPF (Open Shortest Path First) are two routing protocols that support unequal cost load balancing.
In EIGRP, unequal cost load balancing can be achieved by adjusting the "variance" parameter, which is a multiplier that determines the maximum metric of a feasible successor. The feasible successor is a backup route that meets the feasibility condition, which means its reported distance (the sum of the metric from the successor router and the advertised distance to the destination) is less than the current best path's metric. By default, EIGRP only considers successors with the same metric as the best path, but by increasing the variance, EIGRP can include feasible successors with higher metrics.
In OSPF, unequal cost load balancing can be achieved by enabling the "variance" command, which allows OSPF to use paths with metrics that are up to a certain multiple of the best path's metric. For example, if the variance is set to 2, OSPF can use paths with a metric that is up to twice the metric of the best path.
IS-IS (Intermediate System to Intermediate System) and BGP (Border Gateway Protocol) do not support unequal cost load balancing.
RIPng (Routing Information Protocol next generation) is a distance-vector routing protocol that does not support unequal cost load balancing.
NEW QUESTION # 163
Which command is needed to enable DHCP snooping if a switchport is connected to a DHCP server?
- A. ip dhcp snooping information
- B. ip dhcp snooping trust
- C. ip dhcp snooping
- D. ip dhcp trust
Answer: B
Explanation:
When configuring DHCP snooping, follow these guidelines:
DHCP snooping is not active until you enable the feature on at least one VLAN, and enable DHCP globally on the switch.
Before globally enabling DHCP snooping on the switch, make sure that the devices acting as the DHCP server and the DHCP relay agent are configured and enabled.
If a Layer 2 LAN port is connected to a DHCP server, configure the port as trusted by entering the "ip dhcp snooping trust" interface configuration command.
If a Layer 2 LAN port is connected to a DHCP client, configure the port as untrusted by entering the no ip dhcp snooping trust interface configuration command.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/ book/snoodhcp.html
NEW QUESTION # 164
Which design element should an engineer consider when multicast is included in a Cisco SD-Access architecture?
- A. Rendezvous points must be used in a PIM SSM deployment.
- B. PIM SSM must run in the underlay.
- C. Multicast clients reside in the underlay, and the multicast source is outside the fabric or in the overlay.
- D. Multicast traffic is transported in the overlay and the EID space for wired and wireless clients.
Answer: D
Explanation:
Explanation
Multicast traffic is transported in the overlay, in the EID space, for both wired and wireless clients
https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2018/pdf/BRKEWN-2020.pdf
https://www.cisco.com/c/dam/en/us/td/docs/cloud-systems-management/network-automation-and-management/d
NEW QUESTION # 165
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. Traffic shaping
- D. Policing
Answer: D
Explanation:
Explanation
https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/19645-policevsshape.html
NEW QUESTION # 166
Refer to the exhibit.
Refer to the exhibit. An engineer Is designing a multicampus Layer 3 Infrastructure using EIGRP as the routing protocol. The design must provide quick replies to queries In the event of a downlink, prevent unnecessary queries, and ensure that traffic does not unnecessarily transit the access layer. Which two actions must the engineer take for the network design? (Choose two.)
- A. Configure access layer switches to summarize routes to the distribution layer.
- B. Configure access layer and core layer switches as stub routers.
- C. Configure distribution layer switches to summarize routes to the core layer.
- D. Configure access layer switches as stub routers.
- E. Configure core layer switches as stub routers.
Answer: C,D
NEW QUESTION # 167
An existing network solution is using BFD in echo mode. Several of the network devices are experiencing high CPU utilization which an engineer has determined is related to the BFD feature. Which solution should the engineer leverage to reduce the CPU load?
- A. Implement BED asynchronous mode between peers with low CPU resources.
- B. Implement slow timers between peers with low CPU resources.
- C. Utilize carrier delay on all routers in the network.
- D. Enable BFD multi-hop on the devices with low CPU resources.
Answer: B
NEW QUESTION # 168
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. DMVPN
- B. VPWS
- C. MPLS VPN
- D. VPLS
Answer: D
NEW QUESTION # 169
Which two BGP features will result in successful route exchanges between eBGP neighbors sharing the same AS number? (Choose two.)
- A. allow-as-in
- B. as-override
- C. client-to-client reflection
- D. advertise-best-external
- E. bestpath as-path ignore
Answer: A,B
Explanation:
Section: Advanced Addressing and Routing Solutions
NEW QUESTION # 170
Refer to the exhibit. An architect must design a solution to connect the two ASs. To optimize bandwidth, the design will implement load sharing between router R6 and router R4. Which solution should the design include?
- A. Use update-source to specify the Loopback interface.
- B. Use next-hop-serf attributes only for routes that are learned from eBGP peers.
- C. Configure the eBGP TTL to support eBGP multihop.
- D. Use maximum-paths to install multiple paths in the routing table.
Answer: D
NEW QUESTION # 171
Which feature provides the capability for intra-VN traffic filtering and control within the Cisco SD- Access architecture?
- A. service policy
- B. prefix list
- C. MAC ACL
- D. scalable groups
Answer: D
NEW QUESTION # 172 
Refer to the exhibit. An engineer must design an automatic failover solution. The solution should allow HSRP to detect a WAN 1 failure and initiate an automatic failover, making router R2 the active HSRP router. Which two solutions should the engineer choose? (Choose two.)
- A. Implement IP SLA on router R1
- B. Implement Enhanced Object Tracking on roster R1
- C. Implement PBR on router R1
- D. use a floating static route
- E. use IP source routing
Answer: A,B
NEW QUESTION # 173
Drag and drop the steps WAN Edge performs when on-boarded into the Cisco SD-WAN overlay from the left into the order they are completed on the right.
Answer:
Explanation:
NEW QUESTION # 174
Refer to the exhibit. A network engineer must improve the current IS-IS environment. The Catalyst switch is equipped with dual supervisors. Each time a stateful switchover occurs, the network experiences unnecessary route recomputation. Which solution addresses this issue if the upstream router does not understand graceful restart messaging?
- A. Enable NSR on the switch.
- B. Enable NSF on the switch.
- C. Configure ISIS aggressive timers on both devices.
- D. Enable IS-IS remote LFA FRR on both devices.
Answer: A
Explanation:
NSF is also known as gracefull restart. And the router does not understand GR.
NEW QUESTION # 175
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