300-420 Practice Exam Tests Latest Updated on Jul-2024
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Cisco 300-420 certification exam is a challenging test that requires a significant amount of preparation and study. Candidates must have a solid understanding of Cisco enterprise network design principles, concepts, and best practices. They must also have a deep understanding of the latest networking technologies and trends, including software-defined networking (SDN), network automation, and network programmability.
Cisco 300-420 (Designing Cisco Enterprise Networks) Exam is a certification exam that focuses on designing complex enterprise networks. Enterprise networks are critical to the success of any organization, and 300-420 exam validates the knowledge and skills required to design and implement them. Passing 300-420 exam will demonstrate your ability to design solutions that meet the needs of modern enterprise networks, including security, automation, and scalability.
NEW QUESTION # 110
Refer to the exhibit. A network engineer working for a private service provider with an employee ID: 1234:56:789 must design a BGP solution based on:
- All traffic originating from AS100 must pass through AS200 to reach
the NTP and DHCP server
- When a link failure occurs between R3 and R4, traffic must follow the R2-R9 link to reach the NTP and DHCP server Which solution must the design include?
- A. Router R6 influences the paths of R9 and R11 to the DC with a higher AS-PATH value
- B. Routers R3 and R10 advertise an IGP metric into BGP during redistribution in both directions
- C. Routers R3 and R10 advertise a lower local preference for outgoing traffic and a higher AS-PATH value for incoming traffic
- D. Router R3 applies a local preference of 200 for R1, R2, R9, and R11 routers to reach the data center
Answer: A
NEW QUESTION # 111
Refer to the exhibit.
Refer to the exhibit. Area 10 is a regular OSPF area and networks 10.1.1.0/24 and 172.16.1.0/24 are internal. Which design provides optimal routing between both networks when the link between routers C and E fails?
- A. Make area 10 a not-so-stubby area.
- B. Create an OSPF virtual link between routers E and F.
- C. Move the link between routers C and D to area 10.
- D. Create a tunnel between routers E and F in area 10.
Answer: C
NEW QUESTION # 112
An engineer must design a multicast network for a financial application. Most of the multicast sources also receive multicast traffic (many-to-many deployment model). To better scale routing tables, the design must not use source trees. Which multicast protocol satisfies these requirements?
- A. PIM-SM
- B. MSDP
- C. PIM-SSM
- D. BIDIR-PIM
Answer: A
Explanation:
Section: Network Services
NEW QUESTION # 113
An engineer must design a solution to connect a customer to the Internet. The solution will include a Layer 3 circuit with a CIR of 50 Mbps from the service provider. The hand-off from the provider's switch to the customer's router is 1Gbps. Which solution should the engineer include to prevent potential issues with choppy voice traffic?
- A. Implement hierarchical QoS with a parent policing policy.
- B. Reduce the bandwidth of the connection to the router.
- C. Implement hierarchical QoS with a parent shaping policy.
- D. Add a bandwidth statement to the router interface.
Answer: C
Explanation:
Section: WAN for Enterprise Networks
NEW QUESTION # 114
Which QoS feature responds to network congestion by dropping lower priority packets?
- A. strict priority
- B. CBWFQ
- C. tail drop
- D. WRED
Answer: D
Explanation:
WRED can selectively discard lower priority traffic when the interface begins to get congested and provide differentiated performance characteristics for different classes of service.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conavd/configuration/15-mt/qos-conavd-
15-mt-book/qos-conavd-
oview.html#:~:text=WRED%20can%20selectively%20discard%20lower,for%20different%20class es%20of%20service.
NEW QUESTION # 115
Since installing a cisco TelePresence system, the company is experiencing other application having response issues when the system in use. As a result, the company asked an architect to recommend a QoS solution. The customer is currently using a CBWFQ policy to manage traffic on an internet connection with a speed of 100 Mbps. Which link-capacity limit must the architect choose for strict-priority for the real-time traffic?
- A. 50 Mbps
- B. 33 Mbps
- C. 25 Mbps
- D. 75 Mbps
Answer: B
Explanation:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conmgt/configuration/xe-3s/qos-conmgt-xe-3s-book/qos-conmgt-oview.html#GUID-48F6AF58-5CCC-44A0-B868-125AE453FF2A%20%20%20%20%20%20(75%20Mbps) The sum of all bandwidth allocation on an interface cannot exceed 75 percent of the total available interface bandwidth. The remaining 25 percent is used for other overhead, including Layer 2 overhead, routing traffic, and best-effort traffic. Bandwidth for the CBWFQ class-default class, for instance, is taken from the remaining 25 percent.
NEW QUESTION # 116
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. MSTP
- B. RSTP
- C. Rapid PVST
- D. STP
Answer: A
NEW QUESTION # 117
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. 802.16 WiMAX
- B. LTE
- C. Laser link
- D. 802.15.1 Bluetooth
Answer: B
NEW QUESTION # 118
An engineer must propose a solution for a campus network that includes the capability to create multiple Layer 3 virtual networks. Each network must have its own addressing structure and routing table for data forwarding. The solution must be scalable to support hundreds of virtual networks and allow simple configuration and management with minimal administrative overhead. Which solution does the engineer recommend?
- A. multihop MPLS core
- B. hop-by-hop EVN
- C. hop-by-hop VRF-Lite
- D. multihop IPsec tunneling
Answer: B
NEW QUESTION # 119
Which switch feature prevents traffic on a LAN from being overwhelmed by continuous multicast or broadcast traffic?
- A. port security
- B. VTP pruning
- C. VLAN trunking
- D. storm control
Answer: D
Explanation:
A traffic storm occurs when packets flood the LAN, which creates excessive traffic and degrades network performance. The traffic storm control feature prevents LAN ports from being disrupted by a broadcast, multicast, or unicast traffic storm on physical interfaces from either mistakes in network configurations or from users issuing a DoS attack.
Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/ book/storm.pdf
NEW QUESTION # 120
You are implementing WAN access for an enterprise network while running applications that require a fully meshed network, which two design standards are appropriate for such an environment? (Choose two)
- A. A centralized DMVPN solution to simplify connectivity for the enterprise
- B. A dedicated WAN distribution layer to consolidate connectivity to remote sites
- C. A collapsed core and distribution layer to minimize costs
- D. Multiple MPLS VPN connections with dynamic routing
- E. Multiple MPLS VPN connections with static routing
Answer: A,B
Explanation:
With DMVPN phase 2 and 3, spokes can speak with each other directly like they are directly connected in a meshed network. This simplifies the connectivity for the enterprise -> Answer A is correct.
Another way to run applications that require a fully meshed network is through a WAN distribution layer that is connected to all remote sites. Therefore these sites can communicate with each other via this WAN distribution layer.
NEW QUESTION # 121
An engineer must establish a direct connection between two remote offices. The new connection must be established using a logical path, share a common broadcast domain, connect over private WAN, and have as little overhead as possible. Which technology must the engineer choose?
- A. GET VPN
- B. IPsec
- C. GRE
- D. L2VPN
Answer: D
NEW QUESTION # 122
An engineer must design an addressing plan for a small business using a single /24 network. Each department must have its own subnet. Drag and drop the subnets from the left onto the departments requirements that they fulfill on the right. Not all options are used.
Answer:
Explanation:
NEW QUESTION # 123
Refer to the exhibit. An architect must design a solution to connect bank site A with bank site B and support:
- network operation center monitoring end-to-end L3VPN and L2VPN
traffic
- company adding thousands of routes in the next two years
Which two BGP solutions must the design include? (Choose two.)
- A. Connect multiple IGP/LDP domains using a BGP IPv4 unicast family on the ABR.
- B. Establish full mesh IBGP peering with all routers in different IGP domains.
- C. Redistribute different IGP domain routes in a BGP IPv4 routing instance.
- D. Apply BGP policies on all routers to filter out ABR and PE loopback IP addresses.
- E. Transport site routes using a BGP VPNv4 address family on the PE routers.
Answer: A,D
NEW QUESTION # 124
Refer to the exhibit.
An architect must design a solution to connect the network behind R3 with the EIGRP network. Which mechanism should be included to avoid routing loops?
- A. split horizon
- B. summarization
- C. down bit
- D. route tags
Answer: D
NEW QUESTION # 125
Which consideration must be made when designing a Cisco SD-Access fabric underlay?
- A. Up to six control planes are supported.
- B. Subnets must be reduced to decrease latency.
- 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 # 126
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