CISCO 300-510 Implementing Cisco Service Provider Advanced Routing Solutions (SPRI) Free Practice Test — 30 Questions

Question 1

In a service provider network, a router is configured with multiple routing protocols, including OSPF and BGP. The OSPF routing table shows a route to a destination network with a cost of 10, while the BGP routing table shows the same destination with an AS path length of 3. If the router receives a packet destined for this network, which routing protocol will be preferred for forwarding the packet, and what factors contribute to this decision?

Accepted Answer

OSPF will be preferred due to its lower cost metric.

Question 2

In a large service provider network utilizing the IS-IS protocol, a network engineer is tasked with optimizing the routing efficiency between multiple areas. The engineer decides to implement a new Level 1 (L1) and Level 2 (L2) area design. Given that the network consists of three areas (Area 1, Area 2, and Area 3), and the engineer needs to ensure that inter-area routing is efficient while minimizing the overhead of LSP (Link State PDU) flooding, what is the most effective strategy to achieve this?

Accepted Answer

Configure Area 1 as a Level 1 area and Areas 2 and 3 as Level 2 areas, ensuring that only necessary routes are advertised between the levels.

Question 3

In a multi-area OSPF network, you are tasked with optimizing the routing process between Area 0 (the backbone area) and Area 1, which contains several subnets. You notice that the routers in Area 1 are experiencing high latency due to excessive routing updates. To mitigate this, you decide to implement OSPF route summarization at the ABR (Area Border Router) connecting Area 0 and Area 1. What is the primary benefit of this approach, and how does it affect the OSPF routing table size and convergence time?

Accepted Answer

It reduces the size of the OSPF routing table and decreases convergence time by limiting the number of routes advertised to Area 0.

Question 4

In a scenario where a large enterprise is considering transitioning its routing architecture to a service provider model, which of the following key differences should be prioritized in their planning? The enterprise currently utilizes a flat routing structure with a focus on internal traffic optimization, while the service provider model emphasizes scalability and multi-tenancy. What aspect should the enterprise focus on to ensure a successful transition?

Accepted Answer

The need for hierarchical routing design to manage large-scale networks effectively.

Question 5

In a network transitioning to a 5G architecture, a service provider is evaluating the impact of network slicing on resource allocation and management. Given that network slicing allows for the creation of multiple virtual networks on a single physical infrastructure, how does this technology enhance the efficiency of resource utilization while ensuring Quality of Service (QoS) for diverse applications such as IoT, augmented reality, and ultra-reliable low-latency communications (URLLC)?

Accepted Answer

Network slicing enables dynamic allocation of resources based on real-time demand and application requirements, allowing for tailored QoS parameters for each slice.

Question 6

In a network design scenario, a service provider is tasked with allocating IPv4 addresses to multiple customer sites. The provider has a block of 192.168.0.0/24 and needs to subnet this block to accommodate different site sizes. Site A requires 50 hosts, Site B requires 30 hosts, and Site C requires 10 hosts. What is the most efficient way to allocate the subnets while minimizing wasted addresses, and what would be the subnet mask for each site?

Accepted Answer

Site A: /26, Site B: /27, Site C: /28

Question 7

In a service provider environment utilizing Cisco IOS XR, you are tasked with configuring a high-availability routing solution that employs both BGP and OSPF. The network consists of multiple routers, and you need to ensure that the routing protocols can efficiently handle failover scenarios. Given the following requirements: 1) BGP should be used for external routes, 2) OSPF should be used for internal routes, and 3) the routers must support route redistribution between these protocols while maintaining optimal routing paths. Which configuration approach would best achieve these goals while ensuring minimal disruption during failover?

Accepted Answer

Configure BGP as the primary routing protocol and redistribute OSPF routes into BGP with appropriate route maps to control the redistribution process.

Question 8

In a service provider network, you are tasked with implementing Quality of Service (QoS) to ensure that voice traffic is prioritized over video and data traffic. You decide to use Differentiated Services Code Point (DSCP) values to classify and mark packets. If voice packets are marked with a DSCP value of 46, video packets with a DSCP value of 34, and data packets with a DSCP value of 0, which of the following statements best describes the expected behavior of the network when these packets traverse a router configured with QoS policies?

Accepted Answer

Voice packets will be forwarded with the highest priority, ensuring minimal latency and jitter compared to video and data packets.

Question 9

In a service provider network utilizing MPLS for traffic engineering, a network engineer is tasked with optimizing the path for a specific traffic flow that has a bandwidth requirement of 10 Mbps. The current path has a total available bandwidth of 50 Mbps, but due to existing traffic, only 30 Mbps is currently usable. The engineer decides to implement a new MPLS Traffic Engineering (TE) tunnel that can accommodate the required bandwidth. If the new tunnel is established with a maximum bandwidth of 20 Mbps, what is the total available bandwidth for the traffic flow after the new tunnel is added, and what implications does this have for the overall network performance?

Accepted Answer

40 Mbps available bandwidth

Question 10

In a service provider network, a network engineer is tasked with designing a routing policy that optimally manages traffic between multiple customer sites while ensuring minimal latency and maximum bandwidth utilization. The engineer decides to implement BGP with route filtering and path manipulation techniques. Which of the following strategies would best achieve the desired outcome while adhering to BGP best practices?

Accepted Answer

Implementing prefix lists and route maps to control incoming and outgoing routes based on specific criteria.

Question 11

In a Network Functions Virtualization (NFV) architecture, a service provider is tasked with deploying a virtualized firewall service across multiple data centers to enhance security and reduce latency. The provider needs to ensure that the virtualized firewall can scale dynamically based on traffic load. Given that the average traffic load is represented by the function $T(t) = 5t^2 + 3t + 2$, where $t$ is time in hours, determine the rate of change of traffic load at $t = 4$ hours. Additionally, identify which NFV component is primarily responsible for managing the scaling of the virtualized firewall service in response to this traffic load.

Accepted Answer

The NFV Orchestrator

Question 12

In a service provider network, a router is configured to implement traffic shaping for a specific class of traffic that has a committed information rate (CIR) of 1 Mbps and a burst size of 256 KB. The router is also set to police traffic exceeding the CIR using a token bucket algorithm. If the incoming traffic rate fluctuates between 800 Kbps and 1.5 Mbps, calculate the number of tokens that would be available in the bucket after 10 seconds if the token generation rate is set to 1 token per byte. Additionally, determine whether the traffic would be shaped or policed during this period.

Accepted Answer

10,000 tokens, traffic will be policed

Question 13

A network engineer is tasked with designing a subnetting scheme for a corporate network that requires at least 500 hosts in each subnet. The organization has been allocated the IP address block of 192.168.0.0/22. How many subnets can the engineer create, and what will be the subnet mask for each subnet?

Accepted Answer

4 subnets with a subnet mask of /24

Question 14

In a service provider network, a router has received multiple routing updates from different protocols: OSPF, EIGRP, and BGP. The routing table shows the following metrics for a specific destination network: OSPF has a cost of 20, EIGRP has a metric of 150, and BGP has an administrative distance of 20 with a local preference of 100. Given that the router uses the best path selection process, which routing protocol will be preferred for this destination network?

Accepted Answer

OSPF

Question 15

In a large enterprise network, the network management team is tasked with monitoring the performance of various devices across multiple locations. They decide to implement SNMP (Simple Network Management Protocol) for this purpose. Given that the network consists of 500 devices, each generating an average of 10 SNMP traps per hour, calculate the total number of SNMP traps generated by the entire network in a 24-hour period. Additionally, if the team wants to ensure that they can handle a 20% increase in trap generation, how many traps should their monitoring system be capable of processing per hour to accommodate this increase?

Accepted Answer

600 traps per hour

Question 16

In a service provider network, a network engineer is tasked with optimizing the routing protocols to ensure efficient traffic flow and minimal latency. The engineer decides to implement a combination of OSPF and BGP. Given the following network topology, where OSPF is used within the internal network and BGP is used for external routing, what is the primary advantage of using OSPF for internal routing in this scenario?

Accepted Answer

OSPF provides faster convergence times compared to BGP, which is crucial for internal routing efficiency.

Question 17

In a service provider network, a network engineer is tasked with implementing traffic classification and marking for a new VoIP service. The engineer needs to ensure that the VoIP packets are prioritized over other types of traffic to maintain call quality. The engineer decides to use Differentiated Services Code Point (DSCP) values for marking. If the VoIP traffic is marked with a DSCP value of 46, which corresponds to Expedited Forwarding (EF), what is the expected behavior of the network devices when handling this traffic compared to a DSCP value of 0, which represents Best Effort service?

Accepted Answer

The network devices will prioritize the VoIP traffic marked with DSCP 46 over the Best Effort traffic marked with DSCP 0, ensuring lower latency and higher bandwidth allocation for VoIP calls.

Question 18

A network engineer is troubleshooting a service provider\'s MPLS network where users are experiencing intermittent connectivity issues. The engineer suspects that the problem may be related to the Label Distribution Protocol (LDP) configuration. After reviewing the configuration, the engineer finds that the LDP session is established, but the labels are not being distributed correctly. Which of the following actions should the engineer take first to diagnose the issue effectively?

Accepted Answer

Verify the LDP neighbor relationships and ensure that the correct interfaces are enabled for LDP.

Question 19

In a service provider network, a network engineer is tasked with implementing data plane security mechanisms to protect against various types of attacks, including DDoS and packet sniffing. The engineer decides to deploy a combination of Access Control Lists (ACLs) and IPsec to secure the data plane. Given a scenario where the network experiences a sudden spike in traffic, which of the following strategies would best enhance the data plane security while maintaining performance and ensuring legitimate traffic is not disrupted?

Accepted Answer

Implement rate limiting on the ACLs to control the amount of traffic allowed through specific interfaces.

Question 20

In a service provider network, a customer reports intermittent connectivity issues to a specific external site. After initial troubleshooting, you suspect that the problem may be related to routing table inconsistencies. Given that the network uses BGP for external routing, which of the following actions would be the most effective first step to diagnose and resolve the issue?

Accepted Answer

Check the BGP route advertisements and ensure that the correct prefixes are being advertised to the external peer.

Question 21

In a large enterprise network, a network engineer is tasked with implementing OSPF (Open Shortest Path First) routing with authentication to enhance security. The engineer decides to use OSPF MD5 authentication for all routers in the area. During the configuration, the engineer must ensure that the authentication keys are synchronized across all routers to prevent routing issues. If Router A has an MD5 key of \"key123\" and Router B has a key of \"key456\", what potential issues could arise from this configuration, and how should the engineer address them to ensure seamless OSPF operation?

Accepted Answer

The routers will not form OSPF neighbor relationships due to mismatched authentication keys, and the engineer should configure the same MD5 key on both routers.

Question 22

A service provider is tasked with allocating IPv4 addresses for a new customer segment that requires a total of 500 unique addresses. The provider decides to use Variable Length Subnet Masking (VLSM) to optimize address space utilization. If the provider starts with a /24 subnet (which provides 256 addresses), how many additional subnets of /23 (which provides 512 addresses each) will the provider need to allocate to meet the customer\'s requirements?

Accepted Answer

1

Question 23

In a service provider network, a router is experiencing congestion due to a sudden spike in traffic. The network engineer decides to implement Weighted Fair Queuing (WFQ) to manage the traffic effectively. If the total bandwidth of the link is 1 Gbps and the engineer allocates weights of 3, 2, and 1 to three different traffic classes, how much bandwidth will each class receive during congestion? Additionally, if the total traffic during peak hours is 600 Mbps, what percentage of the total traffic will each class represent?

Accepted Answer

Class 1: 450 Mbps, Class 2: 300 Mbps, Class 3: 150 Mbps

Question 24

In a multi-homed environment where a service provider connects to two different ISPs, an organization is using BGP to manage its routing. The organization has configured a local preference value of 200 for routes learned from ISP A and a local preference value of 100 for routes learned from ISP B. Additionally, the AS path for routes from ISP A is shorter than that from ISP B. If a route from ISP A is advertised to the organization with a next hop of 192.0.2.1 and a route from ISP B is advertised with a next hop of 203.0.113.1, which route will the organization prefer based on BGP attributes, and what will be the final decision-making process for selecting the best route?

Accepted Answer

The route from ISP A will be preferred due to the higher local preference value.

Question 25

In a network utilizing the IS-IS protocol, a network engineer is tasked with optimizing the routing efficiency by adjusting the Level 1 and Level 2 IS-IS area configurations. The engineer decides to implement a multi-area design where certain routers will only participate in Level 1 routing, while others will handle both Level 1 and Level 2. Given that the Level 1 routers are responsible for intra-area routing and the Level 2 routers handle inter-area routing, what is the primary benefit of this configuration in terms of routing scalability and efficiency?

Accepted Answer

It reduces the size of the routing table by limiting the number of routes that Level 1 routers need to maintain.

Question 26

In a large enterprise network, the design team is tasked with optimizing OSPF routing to improve efficiency and reduce unnecessary routing updates. They decide to implement different types of OSPF areas. Given the following scenario: Area 1 is a standard OSPF area, Area 2 is configured as a stub area, and Area 3 is configured as a totally stubby area. If a router in Area 2 needs to communicate with a router in Area 3, which of the following statements accurately describes the routing behavior and implications of this configuration?

Accepted Answer

The router in Area 2 will receive external routes from Area 3, but it will not propagate external routes to Area 3.

Question 27

In a multi-homed environment where a service provider is using BGP to manage routing between multiple autonomous systems (AS), consider the following attributes for a route advertised from AS 65001 to AS 65002. The route has a weight of 200, a local preference of 150, an AS path of \"65001 65003 65004\", and a next hop of 192.0.2.1. If AS 65002 receives another route from AS 65005 with a weight of 100, a local preference of 100, an AS path of \"65005\", and the same next hop of 192.0.2.1, which route will AS 65002 prefer based on BGP attributes, and what will be the final decision-making process?

Accepted Answer

The route from AS 65001 will be preferred due to higher weight and local preference.

Question 28

In a service provider network, a network engineer is tasked with optimizing the routing protocols to ensure efficient data flow and minimal latency. The engineer decides to implement a combination of OSPF and BGP to manage internal and external routing. Given the following metrics: OSPF has a cost of 10 for a specific route, while BGP has an AS path length of 3. If the engineer needs to determine the best path for a packet traveling from a source in AS 65001 to a destination in AS 65002, which of the following statements best describes the decision-making process for selecting the optimal route?

Accepted Answer

The OSPF route will be preferred due to its lower cost compared to the BGP AS path length.

Question 29

In a service provider network, two routers, R1 and R2, are configured to establish a BGP peering session. R1 has an AS number of 65001 and R2 has an AS number of 65002. During the session establishment, R1 sends an OPEN message to R2 with the following parameters: Hold Time set to 90 seconds, BGP Version 4, and a Router ID of 192.0.2.1. R2 responds with its own OPEN message, including a Hold Time of 120 seconds, BGP Version 4, and a Router ID of 192.0.2.2. What will be the effective Hold Time for the BGP session between R1 and R2 after the OPEN messages are exchanged?

Accepted Answer

90 seconds

Question 30

In a service provider network, a router has the following routing table entries for a specific destination network 192.168.1.0/24:

Accepted Answer

92.168.1.0/24 via 10.1.1.1 (OSPF, metric 20)

CISCO 300-510 Implementing Cisco Service Provider Advanced Routing Solutions (SPRI) Free Practice Test — 30 Questions

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