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  • Exam Name: Designing Cisco Enterprise Networks (ENSLD)
  • Last Update: Jan 22, 2022
  • Questions and Answers: 149
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300-420 Designing Cisco Enterprise Networks (ENSLD) Questions and Answers

Question # 6

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

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Question # 7

A customer is discussing QoS requirements with a network consultant. The customer has specified that end-to-end path verification is a requirement. Which QoS solution meets this requirement?

A.

IntServ model with RSVP to support the traffic flows

B.

DiffServ model with PHB to support the traffic flows

C.

marking traffic at the access layer with DSCP to support the traffic flows

D.

marking traffic at the access layer with CoS to support the traffic flows

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Question # 8

Which design element should an engineer consider when multicast is included in a Cisco SD-Access architecture?

A.

PIM SSM must run in the underlay.

B.

Multicast clients reside in the underlay, and the multicast source is outside the fabric or

in the overlay.

C.

Rendezvous points must be used in a PIM SSM deployment.

D.

Multicast traffic is transported in the overlay and the EID space for wired and wireless clients.

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Question # 9

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.

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Question # 10

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

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Question # 11

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.

PIM-SSM

B.

PIM-SM

C.

MSDP

D.

BIDIR-PIM

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Question # 12

A company is planning to open two new branches and allocate the 2a01:c30:16:7009::3800/118 IPv6 network for the region. Each branch should have the capacity to accommodate maximum of 200 hosts. Which two networks should the company use? (Choose two.)

A.

2a01:0c30:0016:7009::3a00/120

B.

2a01:0c30:0016:7009::3b00/121

C.

2a01:0c30:0016:7009::3a80/121

D.

2a01:0c30:0016:7009::3b00/120

E.

2a01:0c30:0016:7009::3c00/120

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Question # 13

Refer to the exhibit.

An engineer must optimize the traffic flow of the network. Which change provides a more

efficient design between the access and the distribution layer?

A.

Add a link between access switch A and access switch B

B.

Reconfigure the distribution switch A to become the HSRP Active

C.

Change the link between distribution switch A and distribution switch B to be a routed link

D.

Create an EtherChannel link between distribution switch A and distribution switch B

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Question # 14

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 originated in the RIP domain. Which action should the engineer take?

A.

Make area 1 a NSSA.

B.

Make area 1 a stub.

C.

Make area 1 a standard OSPF area.

D.

Make the area 1 routers part of area 0.

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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

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Question # 16

Which solution allows overlay VNs to communicate with each other in an SD-WAN Architecture?

A.

External fusion routers can be used to map VNs to VRFs and selectively route traffic between VRFs.

B.

GRE tunneling can be configured between fabric edges to connect one VN to another.

C.

SGTs can be used to permit traffic from one VN to another.

D.

Route leaking can be used on the fabric border nodes to inject routes from one VN to another.

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Question # 17

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

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Question # 18

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

B.

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 static routes tied to an IP SLA to prefer the primary path while a floating static route points to the backup connection.

E.

Use OSPF with a passive-interface command on the backup connection.

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Question # 19

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

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Question # 20

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:

Which backup WAN link type the engineer recommend?

A.

LTE

B.

802.16 WiMAX

C.

Laser link

D.

802.15.1 Bluetooth

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Question # 21

An engineer must connect a new remote site to an existing OSPF network. The new site consists of two low-end routers, one for WAN, and one for LAN. There is no demand for traffic to pass through this area. Which area type does the engineer choose to provide minimal router resources utilization, while still allowing for full connectivity to the rest of the network?

A.

not so stubby

B.

totally not so stubby

C.

totally stubby area

D.

stubby area

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Question # 22

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.

PIM-SM

B.

PIM-SSM

C.

any-source multicast

D.

BIDIR-PIM

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