Leading 300-420 Questions 2021

NEW QUESTION 1
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 has no route to R2 and drops the traffic
• B. R1 load-balances across the paths through R3 and R4 to reach R2
• C. R1 forwards the traffic to R3, but R3 drops the traffic
• D. R1 forwards the traffic to R3 in order to reach R2

Answer: D

NEW QUESTION 2
Company A recently acquired another company. Users of the newly acquired company must be able to access a server that exists on Company A’s network, both companies use overlapping IP address ranges. Which action conserves IP address space and provides access to the server?

• A. Use a single IP address to create overload NAT
• B. Use a single IP address to create a static NAT entry
• C. Build one-to-one NAT translation for every user that needs access
• D. Re-IP overlapping address space in the acquired company

Answer: A

NEW QUESTION 3
Drag and drop the characteristics from the left onto the correct telemetry mode on the right.

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
In a dial-in mode, the destination initiates a session to the router and subscribes to data to be streamed. Dialin mode is supported over gRPC in only 64-bit platforms
In a dial-out mode, the router initiates a session to the destinations based on the subscription. All 64-bit IOS XR platforms (except for NCS 6000 series routers) support gRPC and TCP protocols. All 32-bit IOS XR platforms support only TCP.

NEW QUESTION 4
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: AB

NEW QUESTION 5
A customer with an IPv4 only network topology wants to enable IPv6 connectivity while preserving the IPv4 topology services. The customer plans to migrate IPv4 services to the IPv6 topology, then decommission the IPv4 topology. Which topology supports these requirements?

• A. dual stack
• B. 6VPE
• C. 6to4
• D. NAT64

Answer: A

NEW QUESTION 6
Which design consideration should be observed when EIGRP is configured on Data Center switches?

• A. Perform manual summarization on all Layer 3 interfaces to minimize the size of the routing table.
• B. Prevent unnecessary EIGRP neighborships from forming across switch virtual interfaces.
• C. Lower EIGRP hello and hold timers to their minimum settings to ensure rapid route reconvergence.
• D. Configure multiple EIGRP autonomous systems to segment Data Center services and applications.

Answer: A

NEW QUESTION 7
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 EIGRP to establish a neighbor relationship with the main office via L3VPN MPLS and the IPSECVPN tunnel.
• B. Use BGP with the multipath feature enabled to force traffic via the primary path when available.
• C. Use static routes tied to an IP SLA to prefer the primary path while a floating static route points to the backup connection.
• D. Use OSPF with a passive-interface command on the backup connection.

Answer: C

NEW QUESTION 8
Drag and drop the properties from the left onto the protocols they describe on the right.

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:

NEW QUESTION 9
When vEdge router redundancy is designed, which FHRP is supported?

• A. HSRP
• B. OMP
• C. GLBP
• D. VRRP

Answer: D

NEW QUESTION 10
Which consideration must be taken into account when using the DHCP relay feature in a Cisco SD-Access Architecture?

• A. DHCP-relay must be enabled on fabric edge nodes to provide the correct mapping of DHCP scope to the local anycast gateway.
• B. A DHCP server must be enabled on the border nodes to allow subnets to span multiple fabric edges.
• C. DHCP servers must support Cisco SD-Access extensions to correctly assign IPs to endpoints in an SDAccess fabric with anycast gateway.
• D. DHCP Option-82 must be enabled to map the circuit IP option to the access fabric node where the DHCP discover originated.

Answer: A

NEW QUESTION 11
Which two BGP features will result in successful route exchanges between eBGP neighbors sharing the same AS number? (Choose two.)

• A. advertise-best-external
• B. bestpath as-path ignore
• C. client-to-client reflection
• D. as-override
• E. allow-as-in

Answer: DE

NEW QUESTION 12
Which method will filter routes between EIGRP neighbors within the same autonomous system?

• A. distribute-list
• B. policy-based routing
• C. leak-map
• D. route tagging

Answer: A

NEW QUESTION 13
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. DiffServ
• B. LLQ
• C. WRED
• D. IntServ

Answer: D

NEW QUESTION 14
An engineer is designing a QoS policy that queues excess packets for later transmission. Which mechanism must be included in the design?

• A. shaping
• B. WRED
• C. policing
• D. RED

Answer: A

NEW QUESTION 15
Which two routing protocols allow for unequal cost load balancing? (Choose two.)

• A. EIGRP
• B. IS-IS
• C. BGP
• D. OSPF
• E. RIPng

Answer: AC

NEW QUESTION 16
A router running ISIS is showing high CPU and bandwidth utilization. An engineer discovers that the router is configured as L1/L2 and has L1 and L2 neighbors. Which step optimizes the design to address the issue?

• A. Make this router a DIS for each of the interfaces
• B. Disable the default behavior of advertising the default route on the L1/L2 router
• C. Configure the router to be either L1 or L2
• D. Configure each interface as either L1 or L2 circuit type

Answer: D

NEW QUESTION 17
In an SD-WAN architecture, which methods are used to bootstrap a vEdge router?

• A. DHCP options or manual configuration
• B. vManage or DNS records
• C. ZTP or manual configuration
• D. DNS records or DHCP options

Answer: C

NEW QUESTION 18
An organization is designing a detailed QoS plan that limits bandwidth to specific rates. Which two parameters are supported be the traffic policing feature? (Choose two.)

• A. violating
• B. marking
• C. shaping
• D. bursting
• E. conforming

Answer: BC

NEW QUESTION 19
What is an advantage of designing an out-of-band network management solution?

• A. In the event of a production network outage, network devices can still be managed.
• B. There is no separation between the production network and the management network.
• 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: A

NEW QUESTION 20
When IPsec VPNs are designed, what is a unique requirement if support for IP Multicast is required?

• A. encapsulation of traffic with GRE or VTI
• B. IPsec forwarding using transport mode
• C. additional bandwidth for headend
• D. IPsec forwarding using tunnel mode

Answer: A

NEW QUESTION 21
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