CISCO 500-240 Cisco Mobile Backhaul for Field Engineers Free Practice Test — 30 Questions

Question 1

A telecommunications company is planning to upgrade its mobile backhaul network to accommodate a projected increase in data traffic. Currently, the network supports 500 Mbps of throughput, and the company anticipates a 40% increase in traffic over the next year. Additionally, they expect to add new services that will require an additional 150 Mbps. What is the minimum throughput the company should plan for in the next year to ensure adequate capacity?

Accepted Answer

800 Mbps

Question 2

A telecommunications company is planning to expand its mobile backhaul capacity to accommodate a projected increase in data traffic. Currently, the network supports 500 Mbps of throughput, and the company anticipates a 40% increase in traffic over the next year. Additionally, they want to ensure that the network can handle peak traffic, which is typically 25% higher than the average traffic. What is the minimum capacity the company should plan for to meet both the average and peak traffic demands?

Accepted Answer

700 Mbps

Question 3

In a mobile backhaul network, a service provider is evaluating the capacity requirements for transmitting voice and data traffic. The provider estimates that each voice call requires 64 kbps, while each data session requires 512 kbps. If the provider anticipates handling 200 simultaneous voice calls and 150 data sessions at peak times, what is the total bandwidth requirement in Mbps for the backhaul link?

Accepted Answer

88 Mbps

Question 4

In a mobile backhaul network design, a field engineer is tasked with optimizing the bandwidth allocation for a new deployment that will support both voice and data services. The engineer needs to ensure that the total bandwidth is sufficient to handle peak traffic loads while maintaining Quality of Service (QoS) standards. If the peak voice traffic requires 64 kbps per call and the expected maximum number of simultaneous voice calls is 300, while the data traffic is expected to peak at 10 Mbps, what is the minimum total bandwidth required for the backhaul network to accommodate both voice and data traffic without compromising QoS?

Accepted Answer

22.4 Mbps

Question 5

In a network utilizing a QoS model, a service provider is tasked with ensuring that voice traffic is prioritized over video traffic to maintain call quality during peak usage hours. The provider implements a Weighted Fair Queuing (WFQ) mechanism where voice packets are assigned a weight of 5 and video packets a weight of 2. If the total bandwidth available is 100 Mbps, how much bandwidth will be allocated to voice traffic if the total number of packets transmitted during peak hours is 500 voice packets and 300 video packets?

Accepted Answer

71.43 Mbps

Question 6

In the context of future innovations in mobile backhaul, consider a telecommunications company that is evaluating the potential of integrating 5G technology with existing fiber-optic networks. The company aims to enhance its network capacity and reduce latency for its users. If the current latency of the fiber-optic network is 20 milliseconds and the expected latency reduction with 5G integration is 75%, what will be the new latency after the integration? Additionally, how does this integration impact the overall network architecture in terms of scalability and flexibility?

Accepted Answer

5 milliseconds

Question 7

In a mobile backhaul network, a service provider is evaluating the performance of its core network to ensure it meets the demands of increasing data traffic. The provider has a core network architecture that includes multiple routers and switches, and they are considering implementing MPLS (Multiprotocol Label Switching) to enhance traffic management. If the average packet size is 1500 bytes and the network experiences a peak traffic load of 1 Gbps, what is the maximum number of packets that can be transmitted in one second? Additionally, how does the implementation of MPLS improve the efficiency of this core network in handling such traffic loads?

Accepted Answer

833,333 packets per second

Question 8

In a mobile backhaul network, a service provider is evaluating the performance of its core network in terms of latency and bandwidth. The provider has a total of 100 Mbps bandwidth available for backhaul connections. If the average latency for a single user session is measured at 50 ms, and the provider anticipates that the number of concurrent user sessions will increase from 200 to 400, what will be the new average bandwidth per user session, and how does this impact the overall latency experienced by users?

Accepted Answer

250 kbps per user session with potential increased latency due to congestion

Question 9

In a network utilizing multiple routing protocols, a network engineer is tasked with optimizing the routing decisions between OSPF and EIGRP. Given that OSPF uses a link-state routing algorithm while EIGRP employs a distance-vector routing algorithm, how would the engineer best explain the implications of these differences on convergence time and network resource utilization?

Accepted Answer

OSPF generally converges faster than EIGRP due to its use of a link-state algorithm, which allows for quicker dissemination of routing information across the network, but it requires more memory and CPU resources to maintain the link-state database.

Question 10

A telecommunications company is planning to expand its mobile backhaul capacity to accommodate a projected increase in data traffic. Currently, the network supports 500 Mbps of throughput, and the company anticipates a 40% increase in traffic over the next year. Additionally, they expect to implement a new service that will require an additional 150 Mbps. What is the total capacity the company needs to provision to meet the anticipated demand?

Accepted Answer

800 Mbps

Question 11

In the context of future trends in mobile backhaul technologies, a telecommunications company is evaluating the potential impact of deploying a 5G network with enhanced Mobile Broadband (eMBB) capabilities. The company anticipates that the data traffic will increase by 100% annually over the next three years. If the current data traffic is 500 Gbps, what will be the projected data traffic at the end of three years, assuming the growth is compounded annually? Additionally, how does this growth influence the choice of backhaul technology, particularly in terms of capacity and latency requirements?

Accepted Answer

1,125 Gbps

Question 12

In the deployment of a mobile backhaul network in a coastal region, engineers must consider various environmental factors that could impact the network\'s performance and sustainability. If the average temperature in the region is expected to rise by 2°C over the next decade, and the humidity levels are projected to increase by 10%, what are the potential implications for the network\'s equipment and infrastructure? Additionally, consider the impact of saltwater corrosion on the materials used in the deployment. Which of the following considerations should be prioritized to ensure the longevity and reliability of the network?

Accepted Answer

Use corrosion-resistant materials and implement cooling systems to manage temperature and humidity fluctuations.

Question 13

In the context of mobile backhaul networks, which of the following standards is primarily focused on ensuring interoperability and performance in packet-based transport networks, particularly for mobile operators? This standard is crucial for enabling seamless integration of various technologies and ensuring quality of service (QoS) across different network elements.

Accepted Answer

ITU-T G.8031

Question 14

A network engineer is troubleshooting a recurring issue where a specific set of mobile backhaul links intermittently drop packets during peak usage hours. The engineer decides to apply a systematic troubleshooting methodology to identify the root cause. Which of the following steps should the engineer prioritize first to effectively diagnose the problem?

Accepted Answer

Gather and analyze performance metrics from the affected links during peak hours.

Question 15

In a smart city deployment, a telecommunications company is evaluating the integration of 5G technology with IoT devices to enhance urban infrastructure. The company aims to optimize data transmission rates and reduce latency for applications such as traffic management and public safety. If the average data rate of a 5G connection is approximately 10 Gbps and the company plans to connect 1,000 IoT devices, each requiring a minimum bandwidth of 1 Mbps, what is the maximum number of devices that can be supported simultaneously without exceeding the total available bandwidth?

Accepted Answer

10,000 devices

Question 16

In a service provider network, a customer requires the implementation of VLANs and Q-in-Q tunneling to segregate traffic for multiple clients while maintaining the ability to manage and monitor the traffic effectively. If the service provider uses a Q-in-Q configuration, how many VLAN tags will be present in the Ethernet frame when it traverses the service provider\'s network, assuming the customer is using 802.1Q VLAN tagging for their internal traffic?

Accepted Answer

2 VLAN tags

Question 17

In a service provider network utilizing MPLS, a network engineer is tasked with designing a traffic engineering solution to optimize bandwidth usage across multiple paths. The engineer decides to implement MPLS Traffic Engineering (MPLS-TE) with a focus on ensuring that the traffic is distributed evenly across the available paths. Given that the total bandwidth of the links is 1 Gbps and the engineer wants to allocate bandwidth to three different classes of service (CoS) with the following requirements: CoS1 requires 400 Mbps, CoS2 requires 300 Mbps, and CoS3 requires 200 Mbps. What is the maximum bandwidth that can be allocated to CoS1 while still meeting the requirements of CoS2 and CoS3?

Accepted Answer

400 Mbps

Question 18

In a corporate environment, a network engineer is tasked with establishing a secure communication channel between two branch offices using IPsec. The engineer decides to implement a tunnel mode IPsec configuration. Given that the data being transmitted includes sensitive financial information, the engineer must ensure that both confidentiality and integrity are maintained. Which of the following configurations would best achieve this goal while also considering the overhead introduced by encryption and authentication processes?

Accepted Answer

Use AES-256 for encryption and SHA-256 for integrity checks.

Question 19

In a mobile backhaul network, a service provider is tasked with optimizing the transport of data from multiple cell sites to the core network. Each cell site generates an average of 150 Mbps of data traffic. If the provider has a total of 20 cell sites and aims to maintain a 20% overhead for network management and redundancy, what is the minimum required bandwidth for the backhaul connection to ensure optimal performance?

Accepted Answer

3600 Mbps

Question 20

In a recent deployment of a mobile backhaul network, a field engineer observed that the latency in the network increased significantly during peak usage hours. The engineer decided to analyze the impact of various factors on latency, including bandwidth allocation, queuing delays, and the number of active users. If the total latency $ L $ can be expressed as the sum of propagation delay $ P $, transmission delay $ T $, queuing delay $ Q $, and processing delay $ R $, how would the engineer best approach optimizing the network to reduce latency during peak hours?

Accepted Answer

By increasing bandwidth allocation to reduce transmission delay and managing queuing effectively.

Question 21

In a mobile backhaul network, a field engineer is tasked with implementing security measures to protect against unauthorized access and data breaches. The engineer considers several strategies, including encryption, access control, and network segmentation. Which combination of these strategies would most effectively mitigate risks associated with data interception and unauthorized access in a mobile backhaul environment?

Accepted Answer

Implementing end-to-end encryption, strict access control policies, and segmenting the network into distinct zones based on function and sensitivity.

Question 22

A telecommunications company is planning to implement a new mobile backhaul network to support a growing number of IoT devices in a smart city environment. The network must ensure low latency and high reliability while accommodating a peak data rate of 1 Gbps. The company is considering two different architectures: a traditional TDM (Time Division Multiplexing) approach and a packet-based approach using MPLS (Multiprotocol Label Switching). Given the requirements for low latency and high reliability, which architecture would be more suitable for this scenario, and what are the key factors influencing this decision?

Accepted Answer

The packet-based MPLS architecture, due to its ability to efficiently manage bandwidth and provide Quality of Service (QoS) features.

Question 23

In a scenario where a telecommunications company is evaluating different mobile backhaul architectures for a new urban deployment, they are considering the trade-offs between a traditional TDM (Time Division Multiplexing) architecture and a packet-based architecture. The company needs to ensure low latency and high reliability for real-time applications such as VoIP and video streaming. Given the characteristics of both architectures, which architecture would be more suitable for this deployment, considering factors such as scalability, cost, and performance under varying traffic loads?

Accepted Answer

Packet-based architecture

Question 24

In a mobile network, the role of the Radio Access Network (RAN) is crucial for ensuring efficient communication between user devices and the core network. Consider a scenario where a mobile operator is experiencing increased latency and dropped calls in a densely populated urban area. The operator decides to implement a new RAN architecture that includes both macro and small cell deployments. What are the primary benefits of integrating small cells into the existing macro cell infrastructure in this context?

Accepted Answer

Enhanced capacity and improved user experience due to offloading traffic from macro cells

Question 25

In a mobile network, the role of the Radio Network Controller (RNC) is crucial for managing radio resources and ensuring efficient communication between the User Equipment (UE) and the core network. Suppose a mobile operator is experiencing increased latency in data transmission due to inefficient resource allocation. The operator decides to implement a new algorithm for dynamic resource allocation that adjusts the bandwidth based on real-time traffic demands. If the algorithm can increase the available bandwidth by 20% during peak hours and decrease it by 10% during off-peak hours, how would you calculate the effective bandwidth available to a user if the base bandwidth is 50 Mbps during peak hours and 30 Mbps during off-peak hours?

Accepted Answer

60 Mbps during peak hours and 27 Mbps during off-peak hours

Question 26

In a network utilizing MACsec for secure communication, a network engineer is tasked with configuring a MACsec-enabled switch to protect data traffic between two endpoints. The engineer needs to ensure that the switch can handle a maximum throughput of 10 Gbps while maintaining a low latency of less than 5 microseconds. Given that the MACsec protocol uses Galois/Counter Mode (GCM) for encryption, which requires additional processing time, how should the engineer configure the switch to optimize both throughput and latency while ensuring compliance with IEEE 802.1AE standards?

Accepted Answer

Enable MACsec with a key agreement protocol and configure the switch for hardware-based encryption acceleration.

Question 27

In a network troubleshooting scenario, a field engineer is tasked with diagnosing intermittent connectivity issues reported by users in a remote office. The engineer decides to apply a systematic troubleshooting methodology. After gathering initial information, the engineer identifies that the problem occurs during peak usage hours. What should be the next step in the troubleshooting process to effectively isolate the issue?

Accepted Answer

Analyze network traffic patterns and bandwidth utilization during peak hours.

Question 28

In a scenario where a telecommunications company is transitioning from a 4G LTE network to a 5G network, they need to evaluate the impact of 5G on their mobile backhaul infrastructure. Given that 5G technology is expected to support higher data rates, lower latency, and a greater number of connected devices, how should the company approach the redesign of their backhaul network to accommodate these changes? Consider factors such as bandwidth requirements, latency thresholds, and the types of transport technologies that may be employed.

Accepted Answer

The company should implement fiber-optic connections to ensure sufficient bandwidth and low latency, while also considering the use of microwave links for areas where fiber is not feasible.

Question 29

In a network utilizing MACsec for secure communication, a network engineer is tasked with configuring a MACsec-enabled switch to ensure that all traffic between two endpoints is encrypted. The engineer must determine the appropriate key management protocol to use for establishing secure connections and the necessary configuration steps to implement MACsec. Which of the following best describes the correct approach to achieve this?

Accepted Answer

Utilize the MACsec Key Agreement (MKA) protocol to manage keys dynamically and configure the switch to enable MACsec on the relevant interfaces.

Question 30

In a network utilizing Integrated Services (IntServ) for Quality of Service (QoS), a service provider is tasked with ensuring that a video conferencing application receives the necessary bandwidth and low latency for optimal performance. The application requires a guaranteed bandwidth of 1.5 Mbps and a maximum delay of 100 ms. If the network has a total capacity of 10 Mbps and is currently serving three other applications with the following bandwidth requirements: 2 Mbps, 3 Mbps, and 2 Mbps, what is the maximum number of additional video conferencing sessions that can be supported without violating the QoS requirements?

Accepted Answer

1

CISCO 500-240 Cisco Mobile Backhaul for Field Engineers Free Practice Test — 30 Questions

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