Dec-2023 Free Cisco 300-420 Exam Question Practice Exams
Ace 300-420 Certification with 244 Actual Questions
NEW QUESTION # 123
Drag and drop the elements from the left onto the protocols where they are used on the right.
Answer:
Explanation:
Explanation
Graphical user interface, application Description automatically generated
NEW QUESTION # 124
An architect is working on a design to connect a company's main site to several small to medium-sized remote branches. The solution must include redundant WAN links, but the customer has a limited budget and wants the ability to increase the link speed easily in the future. QoS will not on the branch routers so there is no need for consistent end-to-end QoS. Which solution does the architect propose?
- A. dual-homed Internet with a single edge router running a site-to-site VPN topology
- B. dual-homed Internet with dual edge routers running a hub-and-spoke VPN topology
- C. dual-homed WAN MPLS with single edge router
- D. dual-homed WAN MPLS and Internet links via dual edge routers
Answer: A
NEW QUESTION # 125
Refer to the exhibit.
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 # 126
Which two statements about VRRP object tracking are true? (Choose two)
- A. The priority of a VRRP device can change in accordance with the up or down status of a VRRP object
- B. VRRP can track the status of interfaces and routes
- C. The VRRP interface priority must be manually configured by the administrator
- D. VRRP supports only interface tracking
- E. A VRRP group can track only one object at a time
Answer: A,B
Explanation:
https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2019/pdf/BRKCRS-2821.pdf
NEW QUESTION # 127
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. MSDP
- B. BIDIR-PIM
- C. PIM-SSM
- D. PIM-SM
Answer: D
NEW QUESTION # 128
A client is moving to Model-Driven Telemetry and requires periodic updates. What must the network architect consider with this design?
- A. The primary push update is sent immediately and cannot be delayed.
- B. Updates that contain changes within the data are sent only when changes occur.
- C. Empty data subscriptions do not generate empty update notifications.
- D. Periodic updates include a full copy of the data that is subscribed to.
Answer: D
Explanation:
Explanation
Periodic updates contain a full copy of the subscribed data element or table for all supported transport protocols
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/prog/configuration/166/b_166_programmability_cg/model_d
NEW QUESTION # 129
Drag and drop the elements from the left onto the YANG models where they and used on the right.
Answer:
Explanation:
NEW QUESTION # 130
Refer to the exhibit.
Refer to the exhibit. All routers currently reside in OSPF area 0. The network manager recently used R1 and R2 as aggregation routers for remote branch locations and R3 and R4 for aggregation routers for remote office locations. The network has since been suffering from outages, which are causing frequent SPF runs. To enhance stability and introduce areas to the OSPF network with the minimal number of ABRs possible, which two solutions should the network manager recommend? (Choose two.)
- A. a new OSPF area for R1 and R2 connections, with R1 and R2 as ABRs
- B. a new OSPF area for R3 and R4 connections, with R3 and R4 as ABRs
- C. a new OSPF area for R3 and R4 connections, with R5 and R6 as ABRs
- D. a new OSPF area for R1 and R2 connections, with R5 and R6 as ABRs
- E. a new OSPF area for R1, R2, R3, and R4 connections, with R1, R2, R3, and R4 as ABRs
Answer: C,D
NEW QUESTION # 131
Refer to the exhibit.
An architect must design an IPv6 migration solution for an enterprise customer to support these requirements:
* Clients will transition to the new IPv6 network, which provides NAT64 and IPv6 DNS resolution services, using the same DNS name that points to the IPv4 address.
* The service provider will create a client-facing IPv6 interface with a new IPv6 virtual address that points to the same IPv4 DNS server.
* The service provider will support clients that use global IPv6 addresses and encapsulate IPv4 packets into IPv6 tunnels.
Which two migration solutions must the architect choose? (Choose two.)
- A. Use NAT44/64 from the MPLS network to the IGR.
- B. Use NAT44/64 from the devices to the core MPLS network.
- C. Use dual-stack lite from the devices to the core MPLS network.
- D. Use IPv6 tunneling from the devices to the core MPLS network.
- E. Use dual-stack lite from the MPLS network to the IGR.
Answer: A,C
NEW QUESTION # 132
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 # 133
Drag and drop the model-driven telemetry considerations from the left onto the modes they apply to on the right.
Answer:
Explanation:
NEW QUESTION # 134
An engineer uses Postman and YANG to configure a router with:
Which get-config replay verifies that the model set was designed correctly?
- A. Option A
- B. Option D
- C. Option B
- D. Option C
Answer: B
NEW QUESTION # 135
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. any-source multicast
- B. BIDIR-PIM
- C. PIM-SM
- D. PIM-SSM
Answer: D
Explanation:
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 # 136
An engineer must design a routing solution for a company that is single-homed to an ISP. The company's goal is to run BGP between theCEand the PE devices. To support running BGP, the company obtained a public AS number and IP subnet from ARIN. Which solution must the engineer select?
- A. * The customer announces the public IP subnet to the ISP
* The ISP announces the BGP table to the customer - B. * The customer announces the public IP subnet to the ISP
* The ISP announces the default route to the customer. - C. * The customer announces the default route to the ISP
* The ISP announces the default route to the customer - D. * The ISP announces the customer public IP subnet.
* The ISP announces the partial BGP table to the customer.
Answer: D
NEW QUESTION # 137
Refer to the exhibit. AS65533 and AS65530 are announcing a partial Internet routing table as well as their IP subnets. An architect must create a design that ensures AS64512 become a transit AS. Which filtering solution must the architect choose?
- A. Maximum-prefix
- B. Next-hop
- C. No-advertise
Answer: A
NEW QUESTION # 138
A network engineer must design an MSDP multicast solution to provide RP resilience in a network with two separate domains. Also, multicast sources and receivers must register with the local RP. Which solution must the engineer choose?
- A. Configure the RP group ranges to split the multicast traffic, and traffic will route to the longest match
- B. Configure the RP priority with the same value, and traffic will route to the closest RP
- C. Configure the RP has value to 0, and traffic will route to the closest RP
- D. Configure the RP loopback interface with the same IP address/32, and traffic will route to the closest RP
Answer: D
Explanation:
Both can be true and correct because if you check the link:
https://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/115011-anycast-pim.html Relevant running configurations Nexus 1 relevant configuration:
ip pim rp-address 10.1.1.1 group-list 224.0.0.0/4
ip pim anycast-rp 10.1.1.1 192.168.1.1
ip pim anycast-rp 10.1.1.1 192.168.2.2
interface loopback1
ip address 192.168.1.1/32
ip router ospf 1 area 0.0.0.0
ip pim sparse-mode
interface loopback7
ip address 10.1.1.1/32
ip router ospf 1 area 0.0.0.0
ip pim sparse-mode
interface Ethernet9/2
ip address 10.7.7.1/24
ip router ospf 1 area 0.0.0.0
ip pim sparse-mode
interface Ethernet9/3
ip address 172.16.1.2/24
ip router ospf 1 area 0.0.0.0
ip pim sparse-mode
NEW QUESTION # 139
Which solution allows overlay VNs to communicate with each other in an SD-WAN Architecture?
- A. Route leaking can be used on the fabric border nodes to inject routes from one VN to another.
- B. External fusion routers can be used to map VNs to VRFs and selectively route traffic between VRFs.
- C. SGTs can be used to permit traffic from one VN to another.
- D. GRE tunneling can be configured between fabric edges to connect one VN to another.
Answer: D
NEW QUESTION # 140
Refer to the exhibit.
A network engineer is designing a network for AS100. The design should ensure that all traffic enters AS100 via link 1 unless there is a network failure. In the event of a failure, link 2 should function as the path for incoming traffic. Which solution should the design include?
- A. Use AS-Path prepending on R4.
- B. Modify the next-hop attribute on R4.
- C. Modify the next-hop attribute on R3.
- D. Use AS-Path prepending on R3.
Answer: A
NEW QUESTION # 141
An engineer is designing a BGP network for a large customer. To permit efficient scaling, the BGP domain is split into clusters. Which peering solution should be used between the route reflectors in different clusters for the BGP routes to be propagated appropriately?
- A. The route reflectors should not have any kind of BGP peering.
- B. The route reflectors should have peering through another nonclient router.
- C. The route reflectors should be made dents of each other.
- D. The route reflectors should be nonclients with regards to each other.
Answer: D
Explanation:
Explanation
When configure multi-cluster of BGP RRs, RRs should peer with each RR as non-client according to CCIE routing TCP/IP volumn 2 @2001 page 127
- if the route was learned from nonclient IBGP peer, it is reflected to client only (here RR's route learnt from other RRs is able to reflect to its client)
- if the route was learned from a client, it is reflected to all nonclients and clients, except for the originating client. (routes learnt within the cluster can reflect to nonclient, RR)
- it the route was learnt from an EBGP peer, it is reflected to all nonclients and clients.
NEW QUESTION # 142
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 # 143
A customer reports that each time a networking component fails, OSPF recalculates the backup path, with causes a short outage. Which solution must the customer implement to improve this situation?
- A. LFA FRR
- B. BFD
- C. Aggressive OSPF timers
- D. Incremental SPF
Answer: D
Explanation:
Explanation
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-sy/iro-15-sy-book/iro-incre-spf
NEW QUESTION # 144
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. Add a bandwidth statement to the router interface.
- B. Reduce the bandwidth of the connection to the router.
- C. Implement hierarchical QoS with a parent policing policy.
- D. Implement hierarchical QoS with a parent shaping policy.
Answer: D
Explanation:
Section: WAN for Enterprise Networks
NEW QUESTION # 145
Which information update is carried by OMP and enables the Cisco SD-WAN to build a secure overlay fabric on top of any public or private transport without regard for the actual link IP?
- A. RLOC
- B. DTLS
- C. LISP PITR
- D. TLOC
Answer: B
NEW QUESTION # 146
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. bestpath as-path ignore
- E. advertise-best-external
Answer: A,B
NEW QUESTION # 147
Which function do reverse path forwarding mechanisms perform in a multicast deployment?
- A. They send PIM prune message toward multicast sources.
- B. They eliminate overlapping multicast addresses
- C. They notify the upstream routerof multicast traffic.
- D. They prevent loops and duplicate packets.
Answer: D
Explanation:
Explanation
Reverse path forwarding (RPF) mechanisms are used to prevent loops and duplicate packets in multicast deployments [1]. The RPF check verifies that all multicast traffic received on a router is sourced from the expected direction, ensuring that multicast traffic is not looped back in the network. The RPF check works by comparing the source IP address of a multicast packet with the routing table, and only forwarding it if it matches the expected entry.
NEW QUESTION # 148
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