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300-420
Designing Cisco Enterprise Networks (ENSLD) v1.1 Questions and Answers

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Viewing page 8 out of 12 pages

Viewing questions 71-80 out of questions

Questions # 71:

What are two advantages of the Cisco SD-WAN technology9 (Choose two)

Options:

Improved application experience

Easier deployment

Optimized cloud connectivity

Proactive network management

Consistent connectivity

Answer

A, C

Questions # 72:

A customer requires QoS to support multimedia conferencing over MPLS. The network architect chooses to use per-hop behavior. Which solution must the architect use to classify and mark traffic traveling between branch sites?

Options:

BW Queue and DSCP WRED with DSCP AF3

BW Queue with DSCP AF3

BW Queue and DSCP WRED with DSCP AF4

BW Queue with DSCP AF4

Answer

Questions # 73:

An architect is designing a connectivity solution for a customer's two small branch offices. The customer wants a cost-effective design, no routing overload, and some down time during the year is acceptable. Which connectivity solution must the architect choose?

Options:

dual multihomed

single-homed

single multihomed

dual-homed

Answer

Questions # 74:

An engineer working for a service provider with an employee ID: 4863:43:939 must design a solution to provide remote connectivity over the public internet. The design must:

securely connect multiple remote sites to the central site

provide redundant paths to the central site

allow auto path selection based on failure and connection quality

support IP multicast

minimal configuration at remote sites

Which solution must the engineer choose?

Options:

MPLS provided service with BGP

dual DMVPN with EIGRP routing

full mesh OSPF with IPsec tunnels

full mesh ISIS with GRE tunnels and IPsec

Answer

Questions # 75:

An engineer must design a QoS solution for a customer that is connected to an ISP over a 1Gbps link with a 100Mbps CIR. The ISP aggressively drops all traffic received over which is causing numerous TCP retransmissions. The customer is not using any RTP applications but wants to maximize bandwidth usage up to the CIR. Which QoS solution engineer choose?

Options:

Policing

Traffic shaping

Policer with markdown

Queuing

Answer

Explanation

https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/19645-policevsshape.html

Traffic shaping limits the rate of traffic that is sent or received over a network connection by buffering and delaying the flow of data packets. This will help to ensure that the customer is not exceeding the 100Mbps CIR that the ISP has set and also prevent the aggressive dropping of traffic. Traffic shaping will also help to maximize the bandwidth usage while still staying within the limits of the CIR.

Questions # 76:

An architect must create a QoS solution for a customer to ensure that a 40 Mbps Internet connection is shared between four subnets based on these requirements:

* Each subnet must receive no less than 10 Mbps of download bandwidth during peak traffic times.

* A subnet can use up to 40 Mbps during nonpeak traffic times if the other subnets are idle.

* Download traffic must never experience a delay.

Which solution must the architect choose?

Options:

rate-limiting and shaping

bandwidth percentage and policing

shaping and policing

bandwidth percentage and rate-limiting

Answer

Explanation

Selected Answer: B

"Download traffic must never experience a delay."

This means we shouldn't be using Shaping at any point (since that puts packets into a buffer and sends them out later on when congestion has been reduced)

Also: "Rate-limiting" is a bigger term and under it we have 2 things: "Policing" and "Shaping"

Questions # 77:

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?

Options:

Use EIGRP to establish a neighbor relationship with the main office via

L3VPN MPLS and the IPSEC VPN tunnel.

Use BGP with the multipath feature enabled to force traffic via the primary path when available.

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

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

Answer

Questions # 78:

Question # 78

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?

Options:

BFD on all routers

nonstop forwarding on R1 and R3

nonstop forwarding on R3 only

graceful restart on all routers

Answer

Questions # 79:

Refer to the exhibit.

Question # 79

An architect must design an IPv6 migration solution for an enterprise customer to support these requirements:

* Clients will transition to the new IPv6 network, which provides NAT64 and IPv6 DNS resolution services, using the same DNS name that points to the IPv4 address.

* The service provider will create a client-facing IPv6 interface with a new IPv6 virtual address that points to the same IPv4 DNS server.

* The service provider will support clients that use global IPv6 addresses and encapsulate IPv4 packets into IPv6 tunnels.

Which two migration solutions must the architect choose? (Choose two.)

Options:

Use dual-stack lite from the MPLS network to the IGR.

Use IPv6 tunneling from the devices to the core MPLS network.

Use dual-stack lite from the devices to the core MPLS network.

Use NAT44/64 from the MPLS network to the IGR.

Use NAT44/64 from the devices to the core MPLS network.

Answer

C, D

Questions # 80:

An architect must design a QoS model for a business-critical application that Is delay-sensitive and requires high bandwidth. The company's head office hosts the application, and DMVPN tunnels protected with IPsec provide connectivity between the head office and branches. Which solution must the architect choose?