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Cisco 300-420 exam is a certification exam designed for individuals who are interested in pursuing a career in network design. 300-420 exam tests the candidate's knowledge and skills related to designing enterprise networks using Cisco technologies. Designing Cisco Enterprise Networks certification awarded upon passing the exam is the Cisco Certified Design Professional (CCDP).
Cisco 300-420 exam, also known as Designing Cisco Enterprise Networks (ENSLD), is a certification exam that focuses on designing advanced enterprise network solutions. 300-420 exam is intended for network architects, network engineers, and other IT professionals who are responsible for designing, deploying, and maintaining Cisco enterprise network solutions.
NEW QUESTION # 52
Exhibit:
Refer to the exhibit. An engineer is designing a Layer 2 campus network. The design must support fast convergence and leverage as much bandwidth as possible between layers. Distribution switches do support VSS; unfortunately, not all routing protocols are available for use due to license limitations. Which solution must the engineer choose?
- A. RSTP
- B. ECMP
- C. EtherChannel
- D. MEC
Answer: D
NEW QUESTION # 53
An engineer must use YANG with an XML representation to configure a Cisco IOS XE switch with these specifications:
* IP address 10.10.10.10/27 configured on the interface GigabitEthernet2/1/0
* connectivity from a directly connected host 10.10.10.1/27
Which YANG data model set must the engineer choose?
A)
B)
C)
D)
- A. Option D
- B. Option B
- C. Option A
- D. Option C
Answer: A
NEW QUESTION # 54
Which queuing structure is used on SD-WAN Edge routers?
- A. FIFO
- B. LLQ+WFQ
- C. Priority
- D. 1P-4Q-2T
Answer: B
Explanation:
It uses a combination of low latency queuing (LLQ) and weighted fair queuing (WFQ) to prioritize critical traffic while still guaranteeing bandwidth for other traffic types. The LLQ portion of the queuing structure is used to prioritize certain types of traffic, while the WFQ portion is used to ensure that all traffic is serviced fairly. This queuing structure is used to make sure that critical traffic is not delayed or dropped, while still allowing for other traffic types to be serviced.
NEW QUESTION # 55 
Refer to the exhibit. Customers report low video quality and delays when having point-to-point telepresence video calls between the two locations. An architect must optimize a design so that traffic follows the same path for egress and ingress traffic flows. Which technique optimizes the design?
- A. Configure route leaking on the router in area 2.
- B. Configure route leaking on the router in area 1.
- C. Configure route filter on the router in area 4.
- D. Configure the high metric on the router in area 4.
Answer: D
Explanation:
Section: WAN for Enterprise Networks
NEW QUESTION # 56
Refer to the exhibit.
Refer to the exhibit A customer wants to adopt a dynamic site-to-site VPN solution to secure communication for VoIP, video, and FTP traffic between the remote branches and the headquarters. The customer also wants the branches to communicate directly, thereby reducing traffic at the headquarters location. The solution must consider that the branch routers are limited in available memory. Which VPN solution meets these requirements?
- A. DMVPN Phase 2 Hub and Spoke design
- B. DMVPN Phase 3 Hub and Spoke design
- C. DMVPN Phase 3 Hierarchical design
- D. DMVPN Phase 1 Hub and Spoke design
Answer: B
NEW QUESTION # 57 
Refer to the exhibit. Where must an architect plan for route summarization for the topology?
- A. from the aggregation toward the core and the aggregation toward the access
- B. from the core toward the aggregation and the aggregation toward the core
- C. from the core toward the aggregation and the access toward the aggregation
- D. from the aggregation toward the access and the access toward the aggregation
Answer: A
NEW QUESTION # 58 
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. C302 Level 2. A302 Level 1/2. and A101 Level 2
- C. C101 Level 1/2. A201 Level 1, and A101 Level 2
- D. C201 Level 1/2, A301 Level 1/2 and A102 Level 1/2
Answer: D
NEW QUESTION # 59
The customer solution requires QoS to support streaming multimedia over a WAN. An architect chooses to use Per-Hop Behavior. Which solution should the engineer use to of mark traffic traveling between branch sites?
- A. CBWFQ with DSCP AF2
- B. CBWFQ with DSCP AF3
- C. LLQ with DSCP AF4
- D. LLQ with DSCP EF
Answer: D
NEW QUESTION # 60
Drag and drop the model driven telemetry characteristics from the left onto the mode they belong to on the right.
Answer:
Explanation:
NEW QUESTION # 61
Refer to the exhibit. A network engineer is designing an OSPF solution to connect a company's remote to a newly provisioned MPLS VPN backbone. Some of the branches have a direct dark fiber connection between each other. The engineer wants to ensure that the dark fibers are used only when the MPLS core is unavailable. Which solution must the engineer choose?
- A. Stub area
- B. Virtual link
- C. NSSA
- D. Sham link
Answer: D
Explanation:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/xe-16/iro-xe-16-book/iro-sham-link.html
NEW QUESTION # 62
Which method will filter routes between EIGRP neighbors within the same autonomous system?
- A. leak-map
- B. distribute-list
- C. policy-based routing
- D. route tagging
Answer: B
NEW QUESTION # 63
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 # 64
Refer to the exhibit.
Refer to the exhibit. Customers report low video quality and delays when having point-to-point telepresence video calls between the two locations. An architect must optimize a design so that traffic follows the same path for egress and ingress traffic flows. Which technique optimizes the design?
- A. Configure route leaking on the router in area 2.
- B. Configure route leaking on the router in area 1.
- C. Configure route filter on the router in area 4.
- D. Configure the high metric on the router in area 4.
Answer: D
NEW QUESTION # 65
Drag and drop the properties from the left onto the protocols they describe on the right.
Answer:
Explanation:
Reference:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/prog/configuration/166/b_166_programmability_cg/ b_166_programmability_cg_chapter_01011.html
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/prog/configuration/169/b_169_programmability_cg/ configuring_yang_datamodel.html
NEW QUESTION # 66
Refer to the exhibit. An architect reviews the low-level design of a company's enterprise network and advises optimizing the STP convergence time. Which functionality must be to Gi1/0/1-10 to follow the architect's recommendation?
- A. UplinkFast
- B. PortFast
- C. root guard
Answer: B
NEW QUESTION # 67
Drag and drop the properties from the left onto the protocols they describe on the right.
Answer:
Explanation:
NEW QUESTION # 68
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: 10.0.0.0/16
Branchi: 10.255.0.0/20
Branch2: 10.255.16.0/20 - B. * Campus: 10.0.0.0/20
Branch1: 10.0.64.0/21
Branch2: 10.0.128.0/21 - C. * Campus: 10.0.0.0/10
Branch1: 10.64.0.0/10
Branch2: 10.128.0.0/10 - D. * Campus: 10.0.0.0/18
Branch1: 10.0.192.0/21
Branch2: 10.0.200.0/21
Answer: D
NEW QUESTION # 69
Drag and drop the model driven telemetry characteristics from the left onto the mode they belong to on the right.
Answer:
Explanation:
NEW QUESTION # 70
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 be made dents of each other.
- B. The route reflectors should be nonclients with regards to each other.
- C. The route reflectors should have peering through another nonclient router.
- D. The route reflectors should not have any kind of BGP peering.
Answer: B
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 # 71
A network engineer must connect two sites across a public network using a secure tunneling technology that supports multicast traffic. Which technology must be chosen?
- A. GRE
- B. GRE over IPsec
- C. IPsec
- D. PPTP
Answer: B
NEW QUESTION # 72
A branch office has a primary L3VPN MPLS connection back to the main office and an IPSEC VPN tunnel that serves as backup. Which design ensures that data is sent over the backup connection only if the primary MPLS circuit is down?
- A. Use static routes tied to an IP SLA to prefer the primary path while a floating static route points to the backup connection.
- B. Use EIGRP to establish a neighbor relationship with the main office via L3VPN MPLS and the IPSEC VPN tunnel.
- C. Use BGP with the multipath feature enabled to force traffic via the primary path when available.
- D. Use OSPF with a passive-interface
Answer: A
NEW QUESTION # 73
Refer to the exhibit.
EIGRP has been configured on all links. The spoke nodes have been configured as EIGRP stubs, and the WAN links to R3 have higher bandwidth and lower delay than the links to R4. When a link failure occurs at the R1-R2 link, what happens to traffic on R1 that is destined for a subnet attached to R2?
- A. R1 forwards the traffic to R3, but R3 drops the traffic
- B. R1 load-balances across the paths through R3 and R4 to reach R2
- C. R1 forwards the traffic to R3 in order to reach R2
- D. R1 has no route to R2 and drops the traffic
Answer: D
Explanation:
Explanation
The EIGRP stub routing feature will prevent the remote device from advertising core routes back to the distribution devices. Routes learned by the remote device from Distribution 1 will not be advertised to Distribution 2. Therefore, Distribution 2 will not use the remote device as a transit for traffic destined to the network core
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-mt/ire-15-mt-book/ire-eigrp-s
NEW QUESTION # 74
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