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Cisco 300-420 Designing Cisco Enterprise Networks (ENSLD) Exam Practice Test

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Total 242 questions

Designing Cisco Enterprise Networks (ENSLD) Questions and Answers

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Question 1

Refer to the exhibit.

The failover time of ISP-2 is significantly shorter than ISP-1 when an interface on the ISP router toward the campus network fails. Which solution minimizes the downtime to the sub-second?

Options:

A.

Aggressive timers

B.

Next-hop address tracking

C.

Graceful-restart

D.

BFD

Question 2

A network engineer must design a multicast solution to prevent the spoofing of multicast streams and ensure efficient bandwidth utilization. The network will be merged with another multicast domain in the future, and the merge must require minimum effort. Which two solutions meet the customer requirements? (Choose two.)

Options:

A.

PIM-SSM

B.

IGMPv3

C.

IGMPv2

D.

PIM-SM

E.

MSDP

Question 3

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?

Options:

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

Question 4

How is internet access provided to a WAN edge router that is connected to a MPLS transport link?

Options:

A.

OMP advertises a default route from a WAN Edge router that is connected to the MPLS and internet transport networks

B.

Internet access must be provided at the WAN Edge router through either a 4G/5G link or local Internet circuit

C.

An extranet must be provided in the MPLS transport network to allow private traffic to reach the public internet

D.

TLOC extensions are used to route traffic to a WAN Edge router that is connected to the Internet transport network

Question 5

A company plans to transition to IPv6. They will link their IPv4 addresses to the lowest significant bits of the new Ipv6 addresses. A network administrator with an employee id: 4264:42:116 is preparing a mapping schema for the new IPv6 addresses. Which address does the 172.16.10.0/24 network translate to?

Options:

A.

2001:db8:abcd::ac10:a00/120

B.

2001:db8:abcd:172:16:10::/96

C.

2001:db8:abcd:11d8:a00/120

D.

2001:db8:ac10:0a00::/64

Question 6

Refer to the exhibit. An architect is developing a solution to consolidate networks while retaining device redundancy. The routing protocol for the WAN routers must be open standard, ensure high availability, and provide the fastest convergence time. Which solution must the design include?

Options:

A.

both routers running EIGRP

B.

one router running OSPFv2 and other OSPF v3

C.

one router running ISIS and other OSPF v3

D.

both routers running OSPFv2

Question 7

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?

Options:

A.

Local Preference

B.

MED

C.

Weight

D.

AS Path

E.

Community

Question 8

An existing network solution is using BFD in echo mode. Several of the network devices are experiencing high CPU utilization which an engineer has determined is related to the BFD feature. Which solution should the engineer leverage to reduce the CPU load?

Options:

A.

Implement slow timers between peers with low CPU resources.

B.

Implement BED asynchronous mode between peers with low CPU resources.

C.

Enable BFD multi-hop on the devices with low CPU resources.

D.

Utilize carrier delay on all routers in the network.

Question 9

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?

Options:

A.

Configure route leaking on the router in area 2.

B.

Configure route leaking on the router in area 1.

C.

Configure the high metric on the router in area 4.

D.

Configure route filter on the router in area 4.

Question 10

Drag and drop the characteristics from the left onto the Yang model they describe on the right.

Select and Place:

Options:

Question 11

Refer to the exhibit.

A network engineer must improve the current IS-IS environment. The Catalyst switch is equipped with dual supervisors. Each time a stateful switchover occurs, the network experiences unnecessary route recomputation. Which solution addresses this issue if the upstream router does not understand graceful restart messaging?

Options:

A.

Enable IS-IS remote LFA FRR on both devices.

B.

Enable NSR on the switch.

C.

Enable NSF on the switch.

D.

Configure ISIS aggressive timers on both devices.

Question 12

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

Options:

A.

    summary-only

B.

    receive-only

C.

    external

D.

    summary

E.

    totally-stubby

F.

    not-so-stubby

Question 13

An engineer must design a management network that enables SSH, NTP, FTP, and SNMP over the production network. The design requires the management of routers and switches that exist across different networks. Which feature must the design include?

Options:

A.

Management Plane Protection

B.

dedicated management console connection per device

C.

terminal server

D.

dedicated management VRF connection per device

Question 14

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

Options:

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.

Question 15

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

Options:

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.

Question 16

Drag and drop the characteristics from the left onto the configuration protocols they describe on the right.

Options:

Question 17

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?

Options:

A.

LTE

B.

802.16 WiMAX

C.

Laser link

D.

802.15.1 Bluetooth

Question 18

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

Options:

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.

Question 19

An engineer must design a scalable QoS architecture that allows the separation of the traffic into classes on predefined business requirements. The design must also utilize the differentiated services code points as the QoS priority descriptor value and support at least 10 levels of classification. Which QoS technology should the engineer include in the design?

Options:

A.

RSVP

B.

Diffserv

C.

Best effort

D.

Interserv

Question 20

A global organization with several branches hired a network architect to design an overlay VPN solution. The branches communicate with each other frequently. The customer expects to add more branches in the future. To meet the customer's security requirements, the architect plans to provide traffic protection using dynamic IPsec tunnels. Which solution should the architect choose?

Options:

A.

DMVPN

B.

EasyVPN

C.

GETVPN

D.

L2TP

Question 21

Which information update is carried by OMP and enables the Cisco SD-WAN to build a secure overlay fabric on top of any public or private transport without regard for the actual link IP?

Options:

A.

TLOC

B.

RLOC

C.

LISP PITR

D.

DTLS

Question 22

An engineer is designing an IPv4 addressing plan for an enterprise with 1000 branches. Each branch requires a prefix for data and a prefix for voice. Each prefix must accommodate up to 128 hosts, and prefixes must facilitate summarization at aggregation points in the network. The security team requires a simple method for identifying voce prefixes. Which allocation does the engineer recommend from the RFC1918 address space?

Options:

A.

/24 prefixes for data from 10.0.0.0/15 and /24 prefixes for voice from 172.16.0.0/15

B.

/24 prefixes for data from 10.0.0.0/8 and /24 prefixes for voice from the next contiguous /24 prefix per site

C.

/25 prefixes for data from 10.0.0.0/8 end /25 prefixes for voice from the next contiguous /25 prefix per branch

D.

/24 prefixes for data from 10.0.0.0/8 and /24 prefixes for voice from 172.16.0.0/12

Question 23

Which two functions are provided by the Cisco SD-WAN orchestration plane? (Choose two.)

Options:

A.

centralized provisioning

B.

primary authentication point

C.

NAT traversal facilitation

D.

Zero Touch Provisioning

E.

troubleshooting and monitoring

Question 24

Which type of rendezvous point deployment is standards-based and supports dynamic RP discovery?

Options:

A.

bootstrap router

B.

Anycast-RP

C.

Auto-RP

D.

static RP

Question 25

Which two BGP features will result in successful route exchanges between eBGP neighbors sharing the same

AS number? (Choose two.)

Options:

A.

advertise-best-external

B.

bestpath as-path ignore

C.

client-to-client reflection

D.

as-override

E.

allow-as-in

Question 26

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?

Options:

A.

R1:

- Routes advertised to ISP-1: 0x AS-path prepend

- Routes received from ISP-1: HIGH local-preference

- Routes advertised 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 action

R2:

- 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 action

R2:

- 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

- Routes received from ISP-1: LOW local-preference

- Routes advertised to R2: community NO-ADVERTISE

- Routes received from R2: no action

R2:

- Routes advertised to ISP-2: 0x AS-path prepend

- Routes received from ISP-2: HIGH local-preference

- Routes advertised to R1: community NO-EXPORT

- Routes received from R1: no action

Question 27

What is the role of a control-plane node in a Cisco SD-Access architecture?

Options:

A.

fabric device that connects wired endpoints to the SD-Access fabric

B.

map system that manages endpoint to device relationships

C.

fabric device that connects APs and wireless endpoints to the SD-Access fabric

D.

map system that manages External Layer 3 networks

Question 28

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?

Options:

A.

PIM-SM

B.

PIM-SSM

C.

any-source multicast

D.

BIDIR-PIM

Question 29

Drag and drop the characteristics from the left onto the YANG models they describe on the right. Not all options are used.

Options:

Question 30

Which consideration must be made when designing a Cisco SD-Access fabric underlay?

Options:

A.

Subnets must be reduced to decrease latency.

B.

Up to six control planes are supported.

C.

The default MTU should be increased.

D.

A unified policy must be used.

Question 31

Refer to the exhibit. An engineer must design an automatic failover solution. The solution should allow HSRP to detect a WAN 1 failure and initiate an automatic failover, making router R2 the active HSRP router. Which two solutions should the engineer choose? (Choose two.)

Options:

A.

Implement Enhanced Object Tracking on router R1

B.

use a floating static route

C.

Implement IP SLA on router R1

D.

Implement PBR on router R1

E.

use IP source routing

Question 32

When a first hop redundancy solution is designed, which protocol ensures that load balancing occurs over multiple routers using a single virtual IP address and multiple virtual MAC addresses?

Options:

A.

GLBP

B.

IRDP

C.

VRRP

D.

HSRP

Question 33

Refer to the exhibit. A customer experienced an unexpected network outage when the link between R1 and R2 went down. An architect must design a solution to ensure network continuity in the event the link fails again. Which solution should the design include?

Options:

A.

Make R31 an L1 router.

B.

Make R3 an L1L2 router

C.

Make Area 0 L2-only

D.

Make R11 an L2 router.

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Total 242 questions