CCNA Discovery 4 Chapter 4 V4.0 Answers

1. The design of an IP telephony system needs to meet the technical requirements to provide a connection to the PSTN as well as provide high-quality voice transmissions using the campus network. Which two elements directly affect the ability of the design to meet these requirements? (Choose two.)

• voice-enabled firewall

• PoE switches and patch panels

• redundant backbone connectivity

voice-enabled router at the enterprise edge

separate voice and data VLANs with QoS implemented


2. Which technology provides a mechanism for implementing QoS at Layer 2?

• ToS



• IP precedence


3. When QoS is implemented in a converged network, which two factors can be controlled to improve performance? (Choose two.)

• link speed


• packet routing


• packet addressing


4. Which two traffic types are examples of external traffic flows? (Choose two.)

• A user in the IT department telnets to the core layer router.

A user in marketing connects to the web server of a competitor.

• A user in the IT department telnets into the access layer switch.

A user in the services department logs in to a web-based email program.

• A user in accounting connects to an FTP server that is connected to the access layer switch.



The network design documents include requirements to prevent switching loops

Refer to the exhibit. The network design documents include requirements to prevent switching loops, to provide link-specific failover, and to provide Layer 3 recovery. Which two protocols would be needed to provide the support? (Choose two.)







6. Which two statements are characteristics of file transfer traffic flows? (Choose two.)

• RTP should be used.

• Packets are small in size.

Transfers are throughput intensive.

Response-time requirements are low.

• Traffic cannot withstand retransmission delays.



Which option correctly matches the terms on top with its definition on the bottom

Refer to the exhibit. Which option correctly matches the terms on top with its definition on the bottom?

• A=1, B=3, C=2, D=4

• A=2, B=1, C=4, D=3

• A=2, B=4, C=1, D=3

• A=3, B=2, C=4, D=1

A=4, B=3, C=1, D=2

• A=4, B=2, C=3, D=1


8. When implementing VoIP services, which two design considerations should be followed? (Choose two.)

Confirm that network jitter is minimal.

• Use TCP to reduce delays and dropped packets.

• Establish priority queuing to ensure that large data packets are sent uninterrupted.

• Disable real-time protocols to reduce queuing strategy demands.

• Ensure that packet delays do not exceed 150 ms.


9. What two Cisco tools can be used to analyze network application traffic? (Choose two.)



• AutoQoS

• Wireshark

• Custom Queuing


10. An analysis of network protocols reveals that RTP and RTCP are being used. What uses these protocols?




• firewall

real-time video



If ACL 150 identifies only voice traffic

Refer to the exhibit. If ACL 150 identifies only voice traffic from network and no other traffic, which queue will voice traffic from other networks use?

• high

• normal

• medium



12. Several web and email servers have recently been installed as part of an enterprise network. The security administrator has been asked to provide a summary of security features that can be implemented to help prevent unauthorized traffic from being sent into or out of sensitive internal networks. Which three features should the security administrator recommend? (Choose three.)


• priority queuing

access control lists

intrusion detection systems


• 128-bit WEP


13. Which two items can be determined by diagramming internal traffic flow? (Choose two.)

• the type of ISP services needed

• the capabilities of end-user devices

the areas where network congestion may occur

• the location of VPN servers used to connect teleworkers

locations where high-bandwidth connections are required


14. A company is considering adding voice and video to the data networks. Which two statements are true if voice and video are added? (Choose two.)

• PoE switches must be purchased.

More UDP-based traffic flows will be evident.

• Response times will be increased even if QoS is implemented.

QoS will most likely be implemented to prioritize traffic flows.

• VPNs will most likely be implemented to protect the voice traffic.


15. A network design must minimize latency to support real-time streaming applications. Which two protocols enable control and scalability of the network resources and minimize latency by incorporating QoS mechanisms? (Choose two.)







16. Which two network applications are most affected by network congestion and delays? (Choose two.)

IP telephony

live video webcasts

• audio file downloads

• online banking services

• file archival and retrieval


17. What is the primary goal of QoS?

• classification of traffic

• filtering and queuing voice traffic

• reducing bandwidth requirements

providing priority service to selected traffic


18. Which two major differences are associated with IP telephony when compared to traditional telephony that uses a PBX? (Choose two.)

manages phones centrally

• utilizes centralized call routing

• creates peer-to-peer relationships between phones

requires a separate infrastructure to support data transfer

• requires significant manual configuration when adding, moving, or changing phones


19. A database server is configured to purge all data that is 60 days old. Ten data items that are 60 days old are to be purged. However, there is a failure halfway through the transaction, and the entire transaction is voided. What type of transaction action occurred?


• consistent

• durable

• isolated


20. When implementing QoS in traffic queues, what is the first step the designer should take to ensure that traffic is properly prioritized?

• define QoS policies

• define traffic classes

• determine traffic patterns

identify traffic requirements

• identify networking equipment


21. A company that has a traditional telephone system wants to convert to IP telephony. Which two factors should be considered for the design? (Choose two.)

• Digital communications systems have greater noise than analog systems when processing voice traffic.

Voice-enabled routers or a server must be used for call control and signaling.

• Voice to IP conversions can cause router overhead.

Power to the phones can be supplied through properly equipped patch panels or switches.

• The cost to combine voice and data VLANs can be a considerable amount.


22. What design strategy should be followed when designing a network that uses video on demand?

• implement the appropriate routing protocol to ensure that data segments arrive in order

• implement different QoS queues based on the type of video traffic being distributed

install servers to store the data in a centrally located server farm

• configure queuing in the core routers to ensure high availability



After configuring QoS

Refer to the exhibit. After configuring QoS, a network administrator issues the command show queueing interface s0/1. What two pieces of information can an administrator learn from the output of this command? (Choose two.)

• queue traffic definitions

• priority list protocol assignments

type of queuing being implemented

number of packets placed in each queue

• queuing defaults that have been changed

• bandwidth utilization counters for each queue


24. In network design, which technology can be implemented to prioritize traffic based on its importance and technical requirements?







25. A customer purchases tickets online and pays using a credit card, but the system goes down before the transaction is complete. What transaction type retains a record of this transaction after the system failure so that the customer will still receive the tickets and the credit card account will be debited accordingly?

• atomic

• consistent


• isolated

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