Free Cisco 300-420 ENSLD Practice Questions 2026 Part3

Question #1

Which NETCONF operation creates filtering that is specific to the session notifications?

A.

B.

C.

D.

View answer

Correct Answer: A

Question #2

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. Move the link between routers C and D to area 10

B. Create an OSPF virtual link between routers E and F

C. Create a tunnel between routers E and F in area 10

D. Make area 10 a not-so-stubby area

View answer

Correct Answer: A

Question #3

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 yearsWhich two BGP solutions must the design include? (Choose two.)

A. Establish full mesh IBGP peering with all routers in different IGP domains

B. Redistribute different IGP domain routes in a BGP IPv4 routing instance

C. Connect multiple IGP/LDP domains using a BGP IPv4 unicast family on the ABR

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

View answer

Correct Answer: CE

Question #4

Refer to the exhibit.An engineer must design a WAN solution so that ISP-1 is always preferred over ISP-2. The path via ISP-2 is considered as a backup and must be used only when the path to ISP-1 is down. Which solution must the engineer choose?

A. R1:- Routes advertised to ISP-1: 0x AS-path prepend- Routesreceived from ISP-1: HIGH local-preference- Routesadvertised to R2: no action- Routes received from R2: community NO-EXPORT R2:- Routes advertised to ISP-2:5x AS-path prepend- Routes received from ISP-2: LOW local-preference-Routes advertised to R1: community NO-ADVERTISE-Routes received from R1: no action

B. R1:- Routes advertised to ISP-1: 0x AS-path prepend- Routes received from ISP-1: HIGH local-preference- Routes advertised to R2: community NO-EXPORT- Routes received from R2: no actionR2:- Routes advertised to ISP-2: 5x AS-path prepend- Routes received from ISP-2: LOW local-preference- Routes advertised to R1: no action- Routes received from R1: no action

C. R1:- Routes advertised to ISP-1: 0x AS-path prepend- Routes received from ISP-1: LOW local-preference-Routes advertised to R2: community NO-ADVERTISE-Routes received from R2: no actionR2:- Routes advertised to ISP-2: 5x AS-path prepend- Routes received from ISP-2: HIGH local-preference-Routes advertised to R1: no action- Routes received from R1: community NO-ADVERTISE

D. R1:- Routes advertised to ISP-1: 5x AS-path prepend- Routesreceived from ISP-1: LOW local-preference- Routesadvertised to R2: community NO-ADVERTISE- Routesreceived from R2: no actionR2:- Routes advertised to ISP-2: 0x AS-path prepend- Routesreceived from ISP-2: HIGH local-preference- Routesadvertised to R1: community NO-EXPORT- Routesreceived from R1: no action

View answer

Correct Answer: B

Question #5

Which element in a Cisco SD-WAN architecture maintains a centralized routing table?

A. vManage NMS

B. vSmart Controller

C. WAN Edge router

D. vBond Orchestrator

View answer

Correct Answer: B

Question #6

Which feature must be incorporated into the campus LAN design to enable Wake on LAN?

A. dynamic ARP Inspection Snooping on layer 2 devices

B. directed broadcasts on layer 3 devices

C. proxy ARP on layer 3 devices

D. DHCP Snooping on layer 2 devices

View answer

Correct Answer: B

Question #7

Refer to the exhibit. A network engineer must design a BGP solution based on:- The route reflector must have one or more direct physical connections to the core routers (R3 and R4).- The route reflector must have full redundancy and avoid a single point of failure.- R2 to R1 link utilization is 90%, and the remaining links are less than 50% utilized.Which two solutions must the design include? (Choose two.)

A. Configure R1 to be a client of R2 and R4

B. Configure R5 to be a client of R3 and R4

C. Configure R2 to be a client of R1 and R4

D. Configure R3 to be a client of R2 and R4

E. Configure R4 to be a client of R1 and R3

View answer

Correct Answer: DE

Question #8

A network solution is being designed for a company that connects to multiple Internet service providers. Which Cisco proprietary BGP path attribute will influence outbound traffic flow?

A. ocal Preference

B. ED

C. eight

D. S Path

E. ommunity

View answer

Correct Answer: C

Question #9

A network engineer must segregate three interconnected campus networks using IS-IS routing. A two-layer hierarchy must be used to support large routing domains and to avoid more specific routes from each campus network being advertised to other campus network routers automatically. Which two actions does the engineer take to accomplish this segregation? (Choose two.)

A. Designate two IS-IS routers as BDR routers at the edge of each campus, and configure one BDR for all Level 1 routers and one BDR for all Level 2 routers

B. Designate two IS-IS routers from each campus to act as Level 1/Level 2 backbone routers at the edge of each campus network

C. Assign the same IS-IS NET value for each campus, and configure internal campus routers with Level 1/ Level 2 routing

D. Utilize different MTU values for each campus network segment

E. Assign a unique IS-IS NET value for each campus, and configure internal campus routers with Level 1 routing

F. Reveal Answer

View answer

Correct Answer: BE

Question #10

Refer to the exhibit. A customer has two eBGP peerings from a single CE router toward two service providers. The customer has hired an architect to design a solution to ensure certain traffic enters the customer's network through interface gig0/0. Which solution must the architect include in the design?

A. Break aggregated routes into longer prefixes and advertise to the preferred service provider

B. Advertise a lower MED value toward the less preferred service provider

C. Prepend additional AS on the AS path toward the preferred service provider

D. Set a higher local preference to the preferred service provider path

View answer

Correct Answer: A

Question #11

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

A. iolating

B. arking

C. haping

D. ursting

E. onforming

View answer

Correct Answer: AE

Question #12

Currently, inter-VRF routing between the global routing table and VRF-A is accomplished on the client firewall, but the customer wants to do this on the core network layer. The customer does not want to run BGP, VRF-Lite, or static routing. Which mechanism meets the requirements?

A. inter-VRF can only be used on an external device with a link in each VRF

B. policy-based routing with the global set statement in a route map

C. route map that matches access lists and prefix lists with the import feature

D. VRF receive feature under the global routing interfaces

View answer

Correct Answer: D

Question #13

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. C101 Level 1/2, A201 Level 1, and A101 Level 2

B. C201 Level 1/2, A301 Level 1/2, and A102 Level 1/2

C. C302 Level 2, A302 Level 1/2, and A101 Level 2

D. C102 Level 2, A202 Level 2, and A102 Level 1

View answer

Correct Answer: A

Question #14

Currently, inter-VRF routing between the global routing table and VRF-A is accomplished on the client firewall, but the customer wants to do this on the core network layer. The customer does not want to run BGP, VRF-Lite, or static routing. Which mechanism meets the requirements?

A. inter-VRF can only be used on an external device with a link in each VRF

B. policy-based routing with the global set statement in a route map

C. route map that matches access lists and prefix lists with the import feature

D. VRF receive feature under the global routing interfaces

View answer

Correct Answer: D

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

View answer

Correct Answer: AC

Question #16

An architect is creating a migration strategy for a large organization in which the choice made by the application between IPv6 and IPv4 is based on the DNS request. Which migration strategy does the architect choose?

A. AFT for public web presence

B. host-initiated tunnels

C. dual-stack

D. site-to-site IPv6 over IPv4 tunnels

View answer

Correct Answer: C

Question #17

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 not have any kind of BGP peering

D. The route reflectors should have peering through another nonclient router

E. Reveal Answer

View answer

Correct Answer: B

Question #18

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, bothcompanies 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

View answer

Correct Answer: A

Question #19

Refer to the exhibits. An engineer is troubleshooting an issue in which the Gig0/2 interface on a Cisco switch named SW2 fails to become the root port. Which two commands must be run on SW2 to resolve this issue? (Choose two.)

A. SW2(config-if)# no spanning-tree cost 4

B. SW2(config)# interface Gig0/2

C. SW2(config-if)# spanning-tree cost 4

D. SW2(config)# interface Fa0/3

E. SW2(config-if)# spanning-tree cost 5

View answer

Correct Answer: BE

Question #20

Which design consideration must be made when using IPv6 overlay tunnels?

A. Overlay tunnels that connect isolated IPv6 networks are considered a final IPv6 network architecture

B. Overlay tunnels should only be considered as a transition technique toward a permanent solution

C. Overlay tunnels should be configured only between border devices and require only the IPv6 protocol stack

D. Overlay tunneling encapsulates IPv4 packets in IPv6 packets for delivery across an IPv6 infrastructure

View answer

Correct Answer: B

Question #21

Which feature must be incorporated into the campus LAN design to enable Wake on LAN?

A. dynamic ARP Inspection Snooping on layer 2 devices

B. directed broadcasts on layer 3 devices

C. proxy ARP on layer 3 devices

D. DHCP Snooping on layer 2 devices

View answer

Correct Answer: B

Question #22

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. ultihop

B. ultipath Load Sharing

C. ext-Hop Address Tracking

D. S-Path Prepending

View answer

Correct Answer: B

Question #23

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 higherbandwidth 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 subnetattached 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

View answer

Correct Answer: A

Question #24

An engineer is designing a BGP solution supporting a VXLAN environment over a Layer 3 IPv4 network fabric with these requirements:-provide Layer 2 adjacency-allow VM migration of workloads between sites-IGP is OSPFWhich BGP address family must the engineer choose?

A. L2VPN VPLS-VPWS

B. L2VPN EVPN

C. IPv4 unicast

D. VPNv4

View answer

Correct Answer: B

Question #25

Which protocol runs between the vSmart controllers and between the vSmart controllers and the vEdge routers, and unifies all control plane functions under a single protocol umbrella?

A. OMP

B. OSPF

C. IKE

D. VRRP

E. BGP

View answer

Correct Answer: A

Question #26

What is a benefit of using VRRPv3 as compared to VRRPv2?

A. VRRPv3 supports IPv4 and IPv6

B. VRRPv3 supports authentication

C. VRRPv3 supports preemption

D. VRRPv3 supports stateful switchover

View answer

Correct Answer: A

Question #27

A company wants to deploy IPv6 within its existing network infrastructure. All current infrastructure equipment supports IPv6, and the company wants a migration strategy that must not require purchasing additional equipment. The plan must keep operational management costs low, support IPv6 multicast, and allow applications to migrate using DNS. Which strategy must the company choose?

A. hybrid ISATAP tunnel model

B. hybrid manual tunnel model

C. dual-stack model

D. service block model

View answer

Correct Answer: C

Question #28

Which feature must be incorporated into the campus LAN design to enable Wake on LAN?

A. dynamic ARP Inspection Snooping on layer 2 devices

B. directed broadcasts on layer 3 devices

C. proxy ARP on layer 3 devices

D. DHCP Snooping on layer 2 devices

View answer

Correct Answer: B

Question #29

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

View answer

Correct Answer: DE

Question #30

A customer with an IPv4 only network topology wants to enable IPv6 connectivity while preserving the IPv4 topology services. The customer plans to migrate IPv4services to the IPv6 topology, then decommission the IPv4 topology. Which topology supports these requirements?

A. dual stack

B. 6VPE

C. 6to4

D. NAT64

View answer

Correct Answer: A

Question #31

Refer to the exhibit.An architect must design an IGP solution for an enterprise customer. The design must support:Physical link flaps should have minimal impact.Access routers should converge quickly after a link failure.Which two ISIS solutions should the architect include in the design? (Choose two.)

A. Use BGP to IS-IS redistribution to advertise all Internet routes in the Level 1 area

B. Advertise the IS-IS interface and loopback IP address toward the Internet and data center

C. Reduce SPF and PRC intervals to improve convergence time

D. Configure all access and aggregate routers to establish Level 1 / Level 2 adjacencies across the network

E. Configure access routers to establish a Level 1 adjacency and aggregate routers to establish a Level 1 / Level 2 adjacency

View answer

Correct Answer: CE

Question #32

An architect is designing a network solution for a customer. The network is IPv6-only with 1000 hosts. The design must provide external access to up to 10 concurrent IPv6 hosts to allow communication with legacy IPv4 devices on an adjacent network. The customer set aside 10 IPv4 addresses to allow for one-to-one communication between hosts. Which solution must the architect select?

A. static NAT-PT

B. dynamic NPTv6

C. stateful NAT64

D. dynamic NAT-PT

View answer

Correct Answer: C

Question #33

Refer to the exhibit. A customer requires maximum uptime for the data plane between R1 and R3 running OSPF.Which solution must the design include for high availability if the routing process on R2 requires maintenance?

A. nonstop forwarding on R3 only

B. graceful restart on all routers

C. nonstop forwarding on R1 and R3

D. BFD on all routers

View answer

Correct Answer: B

Question #34

A company wants to deploy IPv6 within its existing network infrastructure. All current infrastructure equipment supports IPv6, and the company wants a migration strategy that must not require purchasing additional equipment. The plan must keep operational management costs low, support IPv6 multicast, and allow applications to migrate using DNS. Which strategy must the company choose?

A. hybrid ISATAP tunnel model

B. hybrid manual tunnel model

C. dual-stack model

D. service block model

View answer

Correct Answer: C

Question #35

Refer to the exhibit. Which method must an architect use to provide connectivity between the mail servers?

A. ISATAP

B. 6to4

C. 6rd

D. IPv4 compatible

View answer

Correct Answer: B

Question #36

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

A. erform manual summarization on all Layer 3 interfaces to minimize the size of the routing table

B. revent unnecessary EIGRP neighborships from forming across switch virtual interfaces

C. ower EIGRP hello and hold timers to their minimum settings to ensure rapid route reconvergence

D. onfigure multiple EIGRP autonomous systems to segment Data Center services and applications

View answer

Correct Answer: A

Question #37

An engineer is working with NETCONF and Cisco NX-OS based devices. The engineer needs a YANG model that supports a specific feature relevant only to Cisco NX-OS. Which model must the engineer choose?

A. Native

B. IEEE

C. OpenConfig

D. IETF

E. Reveal Answer

View answer

Correct Answer: A

Question #38

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 as 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 R5 and R6 as ABRs

C. a new OSPF area for R3 and R4 connections, with R3 and R4 as ABRs

D. a new OSPF area for R1, R2, R3, and R4 connections, with R1, R2, R3, and R4 as ABRs

E. a new OSPF area for R1 and R2 connections, with R5 and R6 as ABRs

View answer

Correct Answer: BE

Question #39

Refer to the exhibit. Due to budget constraints, a customer decided to purchase WAN routers with one LAN and one WAN interface per device. There is a requirement to connect the three sites to ensure high availability without buying additional WAN links. Which design deployment must the customer choose?

A. ingle-homed hub-and-spoke

B. ingle-homed full mesh

C. ual-homed hub-and-spoke

D. ual-homed full mesh

View answer

Correct Answer: A

Question #40

Which two steps can be taken to improve convergence in an OSPF network? (Choose two.)

A. Use Bidirectional Forwarding Detection

B. Merge all the areas into one backbone area

C. Tune OSPF parameters

D. Make all non-backbone areas stub areas

E. Span the same IP network across multiple areas

View answer

Correct Answer: AC

Question #41

Refer to the exhibit. Which solution decreases the EIGRP convergence time?

A. Enable subsecond timers

B. Increase the hold time value

C. Increase the dead timer value

D. Enable stub routing on the spokes

View answer

Correct Answer: D

Question #42

Refer to the exhibits. An engineer is troubleshooting an issue in which the Gig0/2 interface on a Cisco switch named SW2 fails to become the root port. Which two commands must be run on SW2 to resolve this issue? (Choose two.)

A. SW2(config-if)# no spanning-tree cost 4

B. SW2(config)# interface Gig0/2

C. SW2(config-if)# spanning-tree cost 4

D. SW2(config)# interface Fa0/3

E. SW2(config-if)# spanning-tree cost 5

View answer

Correct Answer: BE

Question #43

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

A. dvertise-best-external

B. estpath as-path ignore

C. lient-to-client reflection

D. s-override

E. llow-as-in

View answer

Correct Answer: DE

Question #44

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 the network's future growth?

A. - Campus: 10

B. - Campus: 10

C. - Campus: 10

D. - Campus: 10

View answer

Correct Answer: A

Question #45

Which two functions does the control plane node provide in a Cisco SD-Access architecture? (Choose two.)

A. LISP proxy ETR

B. host tracking database

C. policy mapping

D. map server

E. endpoint registration

View answer

Correct Answer: BD

Question #46

An infrastructure team is concerned about the shared memory utilization of a device, and for this reason, they need to monitor the device state. Which solution limits impact on the device and provides the required data?

A. IPFIX

B. static telemetry

C. on-change subscription

D. periodic subscription

View answer

Correct Answer: C

Question #47

At which layer does Cisco Express Forwarding use adjacency tables to populate addressing information?

A. Layer4

B. Layer 2

C. Layer 1

D. Layer 3

View answer

Correct Answer: B

Question #48

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. AStub area

B. BSham link

C. CVirtual link

D. DNSSA

View answer

Correct Answer: B

Question #49

Refer to the exhibit. An engineer is designing an OSPF network for a client. Requirements dictate that the routers in Area 1 should receive all routes belonging to the network, including EIGRP, except the ones that originated in the RIP domain. Which action should the engineer take?

A. Make area 1 a NSS

B. Make area 1 a stub

C. Make area 1 a standard OSPF area

D. Make the area 1 routers part of area 0

View answer

Correct Answer: A

Question #50

Refer to the exhibits. An engineer is troubleshooting an issue in which the Gig0/2 interface on a Cisco switch named SW2 fails to become the root port. Which two commands must be run on SW2 to resolve this issue? (Choose two.)

A. SW2(config-if)# no spanning-tree cost 4

B. SW2(config)# interface Gig0/2

C. SW2(config-if)# spanning-tree cost 4

D. SW2(config)# interface Fa0/3

E. SW2(config-if)# spanning-tree cost 5

View answer

Correct Answer: BE

Question #51

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:

A. LTE

B. 802

C. Laser link

D. 802

View answer

Correct Answer: A

Question #52

Which two options can you use to configure an EIGRP stub router? (Choose two)

A. summary-only

B. receive-only

C. external

D. summary

E. totally-stubby

F. not-so-stubby

View answer

Correct Answer: BD

Question #53

A client is moving to Model-Driven Telemetry and requires periodic updates. What must the network architect consider with this design?

A. Updates that contain changes within the data are sent only when changes occur

B. Empty data subscriptions do not generate empty update notifications

C. Periodic updates include a full copy of the data that is subscribed to

D. The primary push update is sent immediately and cannot be delayed

View answer

Correct Answer: C

Question #54

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

View answer

Correct Answer: A

Question #55

An architect is designing a network solution for a customer. The network is IPv6-only with 1000 hosts. The design must provide external access to up to 10 concurrent IPv6 hosts to allow communication with legacy IPv4 devices on an adjacent network. The customer set aside 10 IPv4 addresses to allow for one-to-one communication between hosts. Which solution must the architect select?

A. static NAT-PT

B. dynamic NPTv6

C. stateful NAT64

D. dynamic NAT-PT

View answer

Correct Answer: C

Question #56

Which OSPF area blocks LSA Type 3, 4 and 5, but allows a default summary route?

A. normal

B. stub

C. NSSA

D. totally stubby

View answer

Correct Answer: D

Question #57

Currently, inter-VRF routing between the global routing table and VRF-A is accomplished on the client firewall, but the customer wants to do this on the core network layer. The customer does not want to run BGP, VRF-Lite, or static routing. Which mechanism meets the requirements?

A. inter-VRF can only be used on an external device with a link in each VRF

B. policy-based routing with the global set statement in a route map

C. route map that matches access lists and prefix lists with the import feature

D. VRF receive feature under the global routing interfaces

View answer

Correct Answer: D

Question #58

Refer to the exhibit.An engineer is designing a hierarchical ISIS solution for an enterprise customer with these requirements:Users in areas 25 and 55 send and receive traffic from both backbone areas.Link flaps in areas 35 and 45 must not impact other areas.Routers will double within the next 12 months in areas 35 and 45.Which design must the engineer select?

A. A series routers Level 2, B series routers Level 2, and C series routers Level 1

B. A series routers Level 1/2, B series routers Level 1/2, and C series routers Level 1/2

C. A series routers Level 1/2, B series routers Level 2, and C series routers Level 2

D. A series routers Level 1, B series routers Level 1/2, and C series routers Level 2

View answer

Correct Answer: D

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