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300-420 Dumps Full Questions - Exam Study Guide
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NEW QUESTION 18
Which technology provides a multichassis IP connection between VSS-enabled switches and downstream devices?
- A. PAgP
- B. ICCP
- C. BFD
- D. MEC
- E. LACP
- F. LAG
Answer: D
NEW QUESTION 19
Which solution allows overlay VNs to communicate with each other in an SD-WAN Architecture?
- A. SGTs can be used to permit traffic from one VN to another.
- B. External fusion routers can be used to map VNs to VRFs and selectively route traffic between VRFs.
- C. GRE tunneling can be configured between fabric edges to connect one VN to another.
- D. Route leaking can be used on the fabric border nodes to inject routes from one VN to another.
Answer: C
Explanation:
Section: WAN for Enterprise Networks
NEW QUESTION 20
Refer to the exhibit. The full EIGRP routing table is advertised throughout the network. Currently, users experience data loss when any one link in the network fails. An architect optimizes the network to reduce the impact when a link fails. Which solution should the architect include in the design?
- A. Run BFD on the inter links between EIGRP neighbors.
- B. Summarize the access layer networks from each access layer switch toward the aggregation layer
- C. Reduce the default EIGRP hello interval and hold time
Answer: A
NEW QUESTION 21
What is an advantage of designing an out-of-band network management solution?
- A. There is no separation between the production network and the management network.
- B. In the event of a production network outage, network devices can still be managed.
- C. In the event of a production network outage, it can be used as a backup network path.
- D. It is less expensive than an in-band management solution.
Answer: B
Explanation:
Section: Network Services
Explanation/Reference:
NEW QUESTION 22
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 over IPsec
- B. PPTP
- C. GRE
- D. IPsec
Answer: A
NEW QUESTION 23
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, R2, R3, and R4 connections, with R1, R2, R3, and R4 as ABRs
- B. a new OSPF area for R1 and R2 connections, with R5 and R6 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 R1 and R2 as ABRs
- E. a new OSPF area for R3 and R4 connections, with R3 and R4 as ABRs
Answer: B,C
NEW QUESTION 24
Which switch feature prevents traffic on a LAN from being overwhelmed by continuous multicast or broadcast traffic?
- A. storm control
- B. port security
- C. VTP pruning
- D. VLAN trunking
Answer: A
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 25
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. LLQ with DSCP EF
- B. CBWFQ with DSCP AF2
- C. CBWFQ with DSCP AF3
- D. LLQ with DSCP AF4
Answer: A
NEW QUESTION 26
What is the purpose of a control plane node in a Cisco SD-Access network fabric?
- A. to act as the network gateway between the network fabric and outside networks
- B. to detect endpoints in the fabric and inform the host tracking database of EID-to-fabric-edge node bindings
- C. to identify and authenticate endpoints within the network fabric
- D. to maintain the endpoint database and mapping between endpoints and edge nodes
Answer: B
Explanation:
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html
NEW QUESTION 27
An engineer must design a VPN solution for a company that has multiple branches connecting to a main office.
What are two advantages of using DMVPN instead of IPsec tunnels to accomplish this task? (Choosetwo.)
- A. support for AES 256-bit encryption
- B. lower traffic overhead
- C. dynamic spoke-to-spoke tunnels
- D. greater scalability
- E. support for anycast gateway
Answer: C,D
NEW QUESTION 28
A company is running BGP on a single router, which has two connections to the same ISP. Which BGP feature ensures traffic is load balanced across the two links to the ISP?
- A. Multipath Load Sharing
- B. AS-Path Prepending
- C. Next-Hop Address Tracking
- D. Multihop
Answer: A
NEW QUESTION 29
What is one function of the vSmart controller in an SD-WAN deployment?
- A. responsible for the centralized control plane of the SD-WAN network
- B. provides centralized network management and a GUI to monitor and operate the SD-WAN overlay
- C. provides a data-plane at branch offices to pass traffic through the SD-WAN network
- D. orchestrates vEdge and cEdge connectivity
Answer: A
Explanation:
Explanation/Reference:
NEW QUESTION 30
Which method will filter routes between EIGRP neighbors within the same autonomous system?
- A. policy-based routing
- B. distribute-list
- C. leak-map
- D. route tagging
Answer: B
Explanation:
Section: Advanced Addressing and Routing Solutions
NEW QUESTION 31
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 32
Which control-plane technology allows the same subnet to exist across multiple network locations?
- A. ISE mobility services
- B. VXLAN
- C. FabricPath
- D. LISP
Answer: D
NEW QUESTION 33 
Refer to the exhibit. A customer needs to apply QoS to the network management traffic passing through the GigabitEthernet0/2 interface. All eight queuing classes are in use, so the new requirement must be integrated into the existing policy. Which solution must the customer choose?
- A. Mark the traffic to DSCP CS6 and assign it to the ROUTING class Then, prioritize traffic within the class.
- B. Mark the traffic to DSCP CS2 and assign it to the ROUTING class Then, baseline existing queue sizes to determine if additional bandwidth can be provisioned to the ROUTING class
- C. Mark traffic to DSCP CS5 and assign it to the SIGNALLING class. Then, baseline existing queue sizes to determine if additional bandwidth can be provisioned to the SIGNALLING class.
- D. Mark the traffic to DSCP CS4 and assign it to the SIGNALLING class. Then, prioritize traffic within the class.
Answer: B
NEW QUESTION 34
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 IPsec tunneling
- B. hop-by-hop VRF-Lite
- C. hop-by-hop EVN
- D. multihop MPLS core
Answer: C
Explanation:
Section: WAN for Enterprise Networks
NEW QUESTION 35 
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 WAN 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 forwards the traffic to R3 in order to reach R2
- C. R1 has no route to R2 and drops the traffic
- D. R1 load-balances across the paths through R3 and R4 to reach R2
Answer: B
Explanation:
Section: Advanced Addressing and Routing Solutions
NEW QUESTION 36
An engineer is designing a Layer 3 campus network running EIGRP between the core, aggregation, and access layers. The access layer switches will be connected to the aggregation layer using Layer 3 copper connections. The engineer wants to improve convergence time for access layer switch failures. Which technique must the design include?
- A. enabling BFD for EIGRP on the access layer uplinks
- B. EIGRP summarization from core to aggregation layer
- C. EIGRP summarization from access to aggregation layer
- D. reducing the EIGRP Hello / Hold timer values
Answer: A
Explanation:
Section: Advanced Enterprise Campus Networks
NEW QUESTION 37
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Objectives of 300-420 Test
There are various topics that are included in the exam and they are:
- Enterprise Networks and WAN (20%).
This section addresses the following areas: comparison of WAN connectivity options (DWDM, Layer 2 VPN, 4G/5G, Metro Ethernet, etc.); designing site-to-site VPN, including dynamic multipoint VPN, Ipsec, GRE, and others; designing high availability for enterprise WAN (failover, backip connectivity, etc.); Cisco SD-WAN architecture (on-boarding, security, control plane, and more); Cisco SD-WAN design considerations (redundancy, security design, overlay design, and others).- Automation (10%).
The Automation domain includes things like choosing the correct YANG data model taking current requirements into account; differentiating between IETF, Cisco native YANG models, and Openconfig as well as between RESTCONF and NETCONF; understanding the impact of model-drive telemetry, covering on-change and periodic publications; comparing dial-in and dial-out approaches to model-drive telemetry.- Advanced Enterprise Campus Networks (25%).
This part of the exam content measures one's skills in designing campus networks for high availability and knowledge of techniques for platform abstraction, graceful restart, etc.; designing campus Layer 2 infrastructures and multicampus Layer 3 ones, including route summarization, VRFs, convergence, etc.; describing SD-Access Architecture as well as SD-Access fabric design for wireless and wired access.- Network Services (20%).
The last domain focuses on the ability to choose proper QoS strategies, designing network management techniques; designing end-to-end QoS policies covering shaping, queuing, marking, and more; describing multicast routing concepts, and creating multicast services, including MSDP, SSM, and PIM bidirectional.- Advanced Address and Routing Solutions (25%).
This domain mainly focuses on creating structured addressing plans for IPv4 and IPv6; creating scalable, stable, and secure routing designs for IS-IS, EIGRP, OSPF, and BGP, including route filtering, load sharing, address families, path preference attributes, and route reflectors; determining IPv6 migration strategies, involving native, boundaries, and overlay.
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