[Mar-2025] Updated and Accurate 300-420 Questions & Answers for passing the exam Quickly
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Cisco 300-420 exam is a certification exam that tests a candidate's knowledge and expertise in designing enterprise-level Cisco networks. Designing Cisco Enterprise Networks certification is designed for network engineers, architects, and designers who have experience in designing complex enterprise networks. 300-420 exam covers a wide range of topics such as advanced routing, network security, virtualization, automation, and network programmability. Designing Cisco Enterprise Networks certification is highly valued in the industry as it demonstrates the candidate's ability to design and implement complex network solutions.
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NEW QUESTION # 89
In the SD-WAN underlay network, which WAN Edge VPN ID is defined as the transport VPN and is used to carry control traffic?
- A. VPN 0
- B. VPN 256
- C. VPN 512
- D. VPN 128
Answer: A
NEW QUESTION # 90
Refer to the exhibit. A Cisco Catalyst switch is configured to allow only one MAC address to be learned manually on interface gig0/2. Which command must be run to dynamically learn the devices that are connected to the switch port?
- A. switchport port-security mac-address auto
- B. switchport port-security mac-address sticky
- C. switchport port-security maximum 1 auto
- D. switchport port-security aging
Answer: B
NEW QUESTION # 91
A customer has several remote sites connected with their headquarters through microwave links. An engineer must propose a backup WAN solution based on these conditions:
Which backup WAN link type the engineer recommend?
- A. Laser link
- B. 802.15.1 Bluetooth
- C. LTE
- D. 802.16 WiMAX
Answer: C
NEW QUESTION # 92
Which two statements about VRRP object tracking are true? (Choose two)
- A. The VRRP interface priority must be manually configured by the administrator
- B. VRRP supports only interce tracking
- C. VRRP can track the status of interfaces and routes
- D. A VRRP group can track only one object at a time
- E. The priority of a VRRP device can change in accordance with the up or down status of a VRRP object
Answer: C,E
NEW QUESTION # 93
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. Configure ISIS aggressive timers on both devices.
- B. Enable IS-IS remote LFA FRR on both devices.
- C. Enable NSR on the switch.
- D. Enable NSF on the switch.
Answer: D
NEW QUESTION # 94
Refer to the exhibit.
An architect must design an IP addressing scheme for a multisite network connected via a WAN transit. The campus site must accommodate 12,000 devices and the branch sites must accommodate 1,000 devices. Which address scheme optimizes network device resources, contains convergence events to the different blocks of the network, and ensures future growth of the network?
- A. * Campus: 10.0.0.0/10
* Branch1: 10.64.0.0/10
* Branch2: 10.128.0.0/10 - B. * Campus: 10.0.0.0/20
* Branch1: 10.0.64.0/21
* Branch2: 10.0.128.0/21 - C. * Campus: 10.0.0.0/16
* Branch1: 10.255.0.0/20
* Branch2: 10.255.16.0/20 - D. * Campus: 10.0.0.0/18
* Branch1: 10.0.192.0/21
* Branch2: 10.0.200.0/21
Answer: D
NEW QUESTION # 95
Which two routing protocols allow for unequal cost load balancing? (Choose two.)
- A. OSPF
- B. IS-IS
- C. EIGRP
- D. BGP
- E. RIPng
Answer: A,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 # 96
Which consideration must be made when designing a Cisco SD-Access fabric underlay?
- A. Subnets must be reduced to decrease latency.
- B. Up to six control planes are supported.
- C. A unified policy must be used.
- D. The default MTU should be increased.
Answer: D
Explanation:
Look under "Underlay Network Design". Its the second bullet point. https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html#Underlay_Network_Design
NEW QUESTION # 97
An engineer must propose a QoS architecture model that allows an application to inform the network of its traffic profile and to request a particular type of service to support its bandwidth and delay requirements.
The application requires consistent and dedicated bandwidth end to end. Which QoS architecture model meets these requirements?
- A. IntServ
- B. WRED
- C. DiffServ
- D. LLQ
Answer: A
NEW QUESTION # 98
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. periodic subscription
- B. IPFIX
- C. static telemetry
- D. on-change subscription
Answer: D
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 # 99
An engineer is working for a large cable TV provider that requires multiple sources streaming video on different channels using multicast with no rendezvous point.
Which multicast protocol meets these requirements?
- A. BIDIR-PIM
- B. any-source multicast
- C. PIM-SSM
- D. PIM-SM
Answer: C
Explanation:
PIM-SSM is suitable for when well-known sources exist within the local PIM domain and for broadcast applications. Also, PIM-SSM eliminates the RPs and shared trees.
NEW QUESTION # 100
Which OSPF area blocks LSA Type 3, 4 and 5, but allows a default summary route?
- A. stub
- B. normal
- C. NSSA
- D. totally stubby
Answer: D
Explanation:
Section: Advanced Addressing and Routing Solutions
NEW QUESTION # 101
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. Provision the RPs on the same IP subnet and extend the subnet at Layer 2 between data centers
- B. No action is required because PIM registers from the source will, by default, reach each RP
- C. Enable MSDP between RPs using separate unique loopback interfaces
- D. Enable MSDP between RPs using the configured Anycast RP address
Answer: C
Explanation:
In Anycast RP, two or more RPs are configured with the same IP address on loopback interfaces. The Anycast RP loopback address should be configured with a 32-bit mask, making it a host address. All the downstream routers should be configured to "know" that the Anycast RP loopback address is the IP address of their local RP. IP routing automatically will select the topologically closest RP for each source and receiver.
MSDP used for Anycast RP is an intradomain feature that provides redundancy and load-sharing capabilities. Enterprise customers typically use Anycast RP for configuring a Protocol Independent Multicast sparse mode (PIM-SM) network to meet fault tolerance requirements within a single multicast domain.
https://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/anycast.html#wp1029118
https://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/115011-anycast-pim.html
" You need to have a loopback on each prospective RP router, which is different than the loopback that is being used as the RP address."
NEW QUESTION # 102
Drag and drop the characteristics from the left onto the telemetry mode they apply to on the right.
Answer:
Explanation:
NEW QUESTION # 103
A company has the following network infrastructure. (Refer to the exhibit.)
Router A is a GLBP active virtual gateway with priority level set to 250. Routers B and C are configured with the default GLPB configurations. The configuration of the active virtual gateway needs to be changed such that if the AVG fails, Router C should be elected to be used as an active virtual gateway. As the network administrator, you have been asked to make corresponding changes to the configuration.
Which command would you use for this purpose on Router C, and where would the command be configured?
- A. glbp 10 preempt (on Router B)
- B. glbp 10 priority 200 (on Router C)
- C. glbp 10 preempt (on Router C)
- D. glbp 10 priority 200 (on Router B)
Answer: B
Explanation:
You would configure the glbp 10 priority 200 command on Router C to change the configuration as required.
Gateway Load Balancing Protocol (GLBP) gateway priority determines the role that each GLBP gateway plays and what happens if the AVG fails. In the given scenario, Router A is used as an active virtual gateway. If the AVG in a LAN topology fails, an election process takes place to determine which backup virtual gateway should take over. When you configure this command on Router C, Router C will be elected when Router A fails as an AVG.
Once the configuration change is made, it can be verified by examining the output if the show run command as shown below:
In the above output, it can be determined that the glpb priority 200 command has been applied to the gigabitEthernet0/0 interface on Router
C. If the default priority of 100 had been applied, there would be no line in the output for priority. Because Router B is configured with the default configuration, it will have its priority set to the default level as 100.
You would not use the glbp 10 preempt command on Router B or the glbp 10 preempt command on Router C to change the configuration. You would use this command on a router to enable preemption. Preemption allows a virtual router that was once the AVG to assume its role as active virtual router when it comes back online if it has a higher priority than the current AVG. Alternatively, it can enable a new router with a higher priority to take the role of AVG from the current AVG if the new router has a higher AVG.
You would use not the glbp 10 priority 200 command on Router B to change the configuration. You would run this command if you needed Router B to be elected as the AVR instead of Router C, as running this command on Router B would configure it with higher priority than Router C.
Objective:
Infrastructure Services
Sub-Objective:
Configure and verify first-hop redundancy protocols
References:
Cisco > Home > End-of-Sale and End-of-Life Products > Cisco IOS Software Releases > 12.2T > Product Literature > White Papers > GLBP - Gateway Load Balancing Protocol Cisco > Cisco IOS IP Application Services Command Reference > glbp priority
NEW QUESTION # 104
Which two statements are true regarding Cisco ISE? (Choose two.)
- A. ISE plays a critical role in SD-Access.
- B. ISE can provide data about when a specific device connected to the network.
- C. An ISE deployment requires only a Cisco Access Control System appliance.
- D. Without integration with any other product ISE can track the actual physical location of a wireless endpoint as it moves.
- E. The major business outcomes of ISE are enhanced user experience and secure VLAN segmentation.
Answer: A,B
NEW QUESTION # 105
An engineer is designing an enterprise campus network.
The LAN infrastructure consists of switches from multiple vendors, and Spanning Tree must be used as a Layer 2 loop prevention mechanism.
All configured VLANs must be grouped in two SIP instances.
Which standards-based Spanning Tree technology supports this design solution?
- A. RSTP
- B. STP
- C. Rapid PVST
- D. MSTP
Answer: D
NEW QUESTION # 106
A company must automate a set of complex changes aligned with DR testing in the network.
These changes are specific, and the DR playbook will be adjusted in the future. The playbook has diverse routing and switching assets in scope as well as multiple vendor and hardware platforms.
A developer will create a thin, web front-end microservice and integrate with an Open daylight controller to push changes to the network. Which YANG model should be used?
- A. Use an open YANG model to allow the reuse of code and standardize the implementation across platforms
- B. Use a single native vendor YANG model to minimize development time
- C. Use multiple native vendor YANG models to provide code consistency.
- D. Develop an individualized YANG model to minimize development resources and time to market.
Answer: A
NEW QUESTION # 107
Drag and drop the characteristics from the left onto the YANG modules they describe on the right. Not all options are used.
Answer:
Explanation:
NEW QUESTION # 108
Which two statements describe source trees in a multicast environment? (Choose two.)
- A. Source trees guarantee the minimum amount of network latency for forwarding multicast traffic
- B. Source trees create an optimal path between the source and the receivers
- C. Source trees use a single common root placed at some chosen point in the network
- D. Source trees can introduce latency in packet delivery
- E. Source trees can create suboptimal paths between the source and the receivers
Answer: A,B
Explanation:
Source trees have the advantage of creating the optimal path between the source and the receivers. This advantage guarantees the minimum amount of network latency for forwarding multicast traffic.
NEW QUESTION # 109
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