ICND Interconnecting Cisco Networking Devices Part 2 Free Practice Test — 30 Questions

Question 1

Anya, a network administrator, has recently deployed a new Quality of Service (QoS) policy on a critical Cisco router to prioritize Voice over IP (VoIP) traffic. She has configured Weighted Fair Queuing (WFQ) to manage potential congestion, aiming to ensure low latency for real-time communications. However, after implementation, Anya notices that while VoIP traffic is performing as expected, certain non-VoIP data packets are intermittently experiencing significant latency, disrupting less time-sensitive applications. This suggests a nuanced interaction between the QoS policy and the handling of unmarked or lower-priority traffic within the WFQ framework. Which of the following actions would be the most effective initial step for Anya to diagnose and resolve this issue?

Accepted Answer

Analyze the router's QoS configuration to examine the specific WFQ weights assigned to different traffic classes and review how unmarked traffic is being classified and queued.

Question 2

Anya, a senior network architect, is spearheading a critical transition of a core enterprise network segment from a traditional, hardware-centric model to a new software-defined networking (SDN) framework. The project timeline is aggressive, and initial stakeholder expectations are high for a seamless upgrade. During the early stages of deployment, Anya discovers a previously undocumented incompatibility between the chosen SDN controller and a suite of specialized, older-generation network appliances that are essential for a specific business function. This unforeseen issue disrupts the planned migration sequence and necessitates an immediate re-evaluation of the integration strategy. Anya must quickly assess the situation, identify potential workarounds or alternative solutions, and communicate revised timelines and potential impacts to various business units. Which core behavioral competency is most directly and critically demonstrated by Anya\'s response to this evolving and ambiguous challenge?

Accepted Answer

Adaptability and Flexibility

Question 3

Anya, a network architect, is evaluating routing protocol options for a rapidly expanding multinational corporation\'s network. The company\'s infrastructure is becoming increasingly complex, with interconnections across multiple geographical sites and diverse network segments. Anya is particularly interested in a protocol that excels in large-scale deployments by employing a hierarchical design to manage routing information efficiently and ensure rapid convergence when network topology changes occur. If a critical link within one of the protocol\'s defined areas fails, what is the most characteristic behavior of this routing protocol in isolating the impact of this failure and maintaining overall network stability?

Accepted Answer

Routers in adjacent, unaffected areas will immediately receive detailed, updated link-state information for the entire network, requiring a full recalculation of their routing tables.

Question 4

Anya, a network architect for a large e-commerce platform, is responsible for the inbound traffic flow to a critical server cluster hosted within her organization\'s data center. Her network is multi-homed, with two distinct upstream Internet Service Providers (ISPs), designated as ISP-A and ISP-B. Anya needs to engineer the network so that a greater proportion of external traffic destined for the server cluster enters her network through ISP-A, while still maintaining connectivity through ISP-B as a backup. She has full control over the BGP advertisements made to both ISPs and has confirmed that both ISPs are configured to consider the Multi-Exit Discriminator (MED) attribute when selecting paths for traffic entering their networks and destined for Anya\'s AS. Which BGP attribute manipulation would most directly and effectively achieve Anya\'s objective of preferentially steering inbound traffic through ISP-A?

Accepted Answer

Advertise the server cluster's network prefix to ISP-A with a lower MED value than the MED value used when advertising the same prefix to ISP-B.

Question 5

Anya, a network engineer, is troubleshooting a connectivity problem between two segments of a corporate network. The segments are connected via a Cisco router running EIGRP. She has verified that the interfaces on the router are operational and configured with IP addresses belonging to the respective subnets. EIGRP neighbor relationships are established, and the EIGRP process is active. However, routes originating from one subnet are not being advertised to the other segment, preventing communication. What is the most likely configuration oversight on the router that would lead to this specific behavior, assuming no explicit passive-interface commands are blocking the advertisement?

Accepted Answer

The absence of a `network` command in the EIGRP configuration that matches the IP address range of the unadvertised subnet.

Question 6

Anya, a network engineer, is investigating sporadic packet loss on a critical WAN link managed by a Cisco ISR router. She has verified the physical cabling and confirmed no interface errors are being reported. Her hypothesis centers on a misconfigured Quality of Service (QoS) policy that might be overly aggressive in rate-limiting or shaping traffic, leading to intermittent drops during peak usage. To confirm her suspicion and identify the specific QoS configuration impacting the interface, which command would provide the most direct and insightful output regarding the active QoS policies applied to that interface?

Accepted Answer

show policy-map interface GigabitEthernet0/1

Question 7

Anya, a senior network engineer, is investigating a persistent performance degradation affecting a critical financial trading application across a large, geographically dispersed enterprise network. Users report significant delays in order execution and data synchronization. Initial diagnostics reveal intermittent packet loss and increased jitter on several inter-site links, but no single interface is consistently saturated. The network comprises Cisco routers and switches, firewalls from multiple vendors, and various WAN technologies. Anya suspects that a combination of factors across different network layers might be contributing to the problem, rather than a singular device failure. Which of the following diagnostic approaches would most effectively isolate the root cause of the application\'s performance issues?

Accepted Answer

Systematically analyze packet captures at the application layer to identify malformed packets or protocol anomalies, correlate these with network layer metrics like latency and packet loss on affected paths, and then investigate transport layer behaviors such as TCP retransmission rates and windowing, while also examining physical and data link layer integrity for intermittent link issues.

Question 8

Anya, a network administrator, is implementing a new Quality of Service (QoS) policy on a Cisco ISR router connecting a branch office to the main headquarters. The primary objective is to ensure that Voice over IP (VoIP) traffic experiences minimal delay and jitter, maintaining high call quality, even during periods of network congestion. She has already defined a class-map to identify VoIP traffic based on DSCP values. She now needs to select the most appropriate traffic shaping or queuing action to be applied to this VoIP class within the policy-map. Which of the following actions would best achieve Anya\'s goal of prioritizing real-time voice packets with guaranteed low latency?

Accepted Answer

Low Latency Queuing (LLQ)

Question 9

Anya, a network engineer for a burgeoning fintech company, is observing significant latency and jitter impacting their real-time financial data streams and internal video collaboration tools. The network infrastructure relies on Cisco routers, and the surge in usage has highlighted the need for a robust Quality of Service (QoS) implementation. Anya\'s primary objective is to ensure that voice and video traffic are consistently prioritized, guaranteeing a predictable and high-quality user experience for these critical applications. What is the most effective initial step Anya should undertake to begin configuring the QoS policy on the Cisco routers to achieve this prioritization?

Accepted Answer

Develop a policy map that defines specific traffic classes for voice and video, associating them with appropriate QoS actions.

Question 10

During a critical maintenance window, Anya, a network engineer, is tasked with reconfiguring a core router that serves as the gateway for multiple VLANs. The existing IP addressing scheme is being replaced with a new one, requiring changes to interface IP addresses and potentially subnet masks. Anya has meticulously documented the current configuration and received the precise new IP address assignments. She needs to execute these changes rapidly and accurately to minimize network disruption. Which of the following sequences of actions best reflects a proactive and adaptable approach to managing this transition while ensuring operational continuity?

Accepted Answer

After verifying the new IP address scheme against the network topology and ensuring all necessary VLAN interfaces are correctly configured and activated, Anya should then enable the relevant routing protocols on the updated interfaces, followed by a ping test to a host on a different subnet to confirm reachability.

Question 11

A network administrator observes that users across multiple departments are reporting sporadic packet loss and increased latency on the internal corporate network, but the issue does not appear to affect all users simultaneously or in a consistent pattern. The administrator has access to network monitoring tools but has not yet identified a clear culprit. Which of the following actions best demonstrates adaptability and effective problem-solving in this ambiguous situation?

Accepted Answer

Initiate a phased rollout of a new QoS policy across the entire network to prioritize critical traffic, assuming the performance issues are related to congestion.

Question 12

Anya, a network administrator, is troubleshooting a connectivity issue where users in VLAN 10 cannot reach users in VLAN 20, although both groups can access internal resources within their respective VLANs. Anya has verified that IP addressing, subnet masks, and default gateways are correctly assigned to hosts in both VLANs. The router, acting as the default gateway for both VLANs, has correctly configured subinterfaces with appropriate IP addresses and 802.1Q encapsulation for VLAN 10. However, the communication between VLAN 10 and VLAN 20 remains broken. What specific configuration on the switchport connecting the router to the switch is most likely missing to enable inter-VLAN routing for VLAN 20?

Accepted Answer

The switchport needs to be configured to allow VLAN 20 traffic using the command `switchport trunk allowed vlan add 20`.

Question 13

During the implementation of a new Quality of Service (QoS) policy across a multi-vendor enterprise network, a network administrator, Kai, observes that a critical VoIP application experiences intermittent packet loss and increased jitter, contradicting the expected performance improvements. Standard QoS troubleshooting commands on the affected devices do not reveal any misconfigurations. The network remains functional for other services, but the VoIP degradation is impacting user experience. Kai needs to determine the most appropriate next step to resolve this issue.

Accepted Answer

Analyze the interaction between the newly implemented QoS policy and the existing traffic shaping configurations on all relevant network segments, while also evaluating the feasibility of applying a different queuing mechanism for real-time traffic.

Question 14

Anya, a seasoned network architect, is spearheading a complex network infrastructure upgrade. Her team is migrating a large branch office network from an older, less efficient routing protocol to a more robust and scalable solution. The primary drivers for this change are to improve convergence times and enhance overall network stability, which have been compromised by the legacy protocol\'s limitations. Anya needs to ensure a seamless transition with minimal service interruption for end-users. Considering the inherent complexities of routing protocol transitions and the potential for unforeseen issues, which of the following proactive assessments is most critical for Anya to undertake *before* commencing any configuration changes on the production network?

Accepted Answer

A detailed simulation of the proposed routing protocol's behavior across various network failure scenarios, focusing on convergence characteristics and administrative distance interactions with potential fallback protocols.

Question 15

Anya, a network administrator for a critical infrastructure provider, is alerted to a complete network outage impacting a major financial institution client. The outage occurred during a scheduled, minor configuration change on a distribution layer switch. The client\'s operations are severely hampered, and they are demanding immediate restoration. Anya has access to all network monitoring tools and device configurations. Which course of action best demonstrates her ability to manage this crisis effectively while adhering to best practices for network incident response and client communication?

Accepted Answer

Immediately begin a deep dive into the core routing protocol configurations on the core routers to identify any subtle BGP or OSPF flapping.

Question 16

A network administrator is tasked with migrating a legacy campus network from an older, proprietary routing protocol to a more modern, standards-based OSPFv3 implementation. Simultaneously, the organization is rolling out a new Software-Defined Networking (SDN) controller that will manage a segment of the network. During the migration, several unexpected interoperability issues arise between the new OSPFv3 configuration and existing Layer 2 security policies, causing intermittent connectivity for a critical research department. The administrator’s direct supervisor has emphasized maintaining uptime for this department above all else, but also stressed the importance of adopting the new technologies within the quarter. Which of the following approaches best demonstrates the required adaptability and flexibility to effectively manage this situation?

Accepted Answer

Temporarily revert the OSPFv3 configuration for the affected research department segment to its previous state, while simultaneously dedicating resources to thoroughly investigate and resolve the interoperability conflict with the SDN controller and security policies before reattempting the OSPFv3 deployment.

Question 17

Anya, a network engineer supporting a distributed enterprise, is investigating intermittent connectivity failures between a remote branch office and the central data center. Network monitoring reveals a significant surge in ICMP echo requests originating from within the branch office network, all directed towards the data center\'s primary gateway. Basic physical layer checks and common IP configuration verifications have been completed without resolution. To isolate the specific host generating this unusual volume of ICMP traffic, which of the following diagnostic actions would be most effective for Anya to perform on the branch office\'s edge router?

Accepted Answer

Utilize the `show ip cache flow` command on the branch router

Question 18

Anya, a network administrator, is tasked with implementing a Quality of Service (QoS) policy to prioritize Voice over IP (VoIP) traffic across a busy enterprise network experiencing intermittent congestion. She receives initial requirements from the IT department, but the marketing team later requests higher priority for their video conferencing tools, creating a conflict. As she begins implementation, she discovers that the chosen queuing mechanism is not effectively mitigating latency for VoIP calls during peak hours, necessitating a re-evaluation of her strategy. Which of the following behavioral competencies is Anya most critically demonstrating through her actions in this scenario?

Accepted Answer

Adaptability and Flexibility

Question 19

A network administrator is configuring route summarization on a Cisco router to reduce the size of routing tables across the enterprise. The router has multiple connected subnets within the $10.10.0.0/16$ range, including $10.10.1.0/24$, $10.10.2.0/24$, and $10.10.3.0/24$. The administrator decides to summarize these into a single route. If the link to $10.10.2.0/24$ fails, what is the most likely immediate consequence for traffic destined for any IP address within the $10.10.2.0/24$ subnet, assuming no additional preventative measures are in place?

Accepted Answer

Traffic destined for $10.10.2.0/24$ will be dropped because the summarized route will no longer be advertised.

Question 20

Anya, a network administrator for a multinational corporation, is responsible for a critical VoIP deployment that spans multiple continents. She has implemented a Cisco Quality of Service (QoS) policy on the core routers to ensure low latency and jitter for voice calls, while also allowing for high-throughput file transfers during off-peak hours. However, recent user feedback indicates that call quality degrades significantly during periods of high network utilization, and some critical data transfers are experiencing unexpected delays. Anya suspects that the existing classification and marking mechanisms are not accurately distinguishing between the real-time voice traffic and other types of data that are also consuming bandwidth. To address this issue and improve the overall effectiveness of the QoS strategy, what is the most prudent initial action Anya should take?

Accepted Answer

Refine the access control lists (ACLs) and Network Based Application Recognition (NBAR) configurations used for traffic classification to ensure accurate identification of VoIP packets.

Question 21

Anya, a senior network administrator, observes a growing trend of sophisticated, state-sponsored attacks targeting critical infrastructure, alongside an increasing demand for high-bandwidth, low-latency connectivity to support the company\'s new global cloud-based analytics platform. Her current network, designed a decade ago, relies on legacy routing protocols and a centralized security model that is proving inadequate. The executive team has mandated a 20% annual increase in data processing capacity and a significant reduction in network downtime. Anya\'s team is skilled in current operations but lacks extensive experience with modern software-defined networking (SDN) and zero-trust security architectures. What strategic approach best demonstrates Anya\'s adaptability, leadership potential, and problem-solving abilities in this complex environment?

Accepted Answer

Initiate a phased migration to an SDN architecture with a zero-trust security framework, prioritizing core infrastructure upgrades and providing targeted training for her team on new methodologies, while actively communicating the strategic benefits and implementation roadmap to stakeholders.

Question 22

Anya, a network engineer, is tasked with overhauling a legacy branch office network that suffers from frequent, undocumented outages and uses an outdated routing protocol. Her directive is to implement a more resilient and scalable solution within a compressed timeframe, with strict instructions to avoid any impact on active user sessions. The existing network documentation is sparse, and the original implementation team is no longer available. Which combination of behavioral competencies and technical skills would be most critical for Anya to successfully navigate this complex and ambiguous project?

Accepted Answer

Adaptability and flexibility, problem-solving abilities, communication skills, and technical troubleshooting proficiency

Question 23

Anya, a network engineer at a financial institution, is tasked with resolving intermittent connectivity disruptions affecting a critical trading platform segment. Standard diagnostic tools, including interface statistics, SNMP monitoring, and basic packet captures on core routers, have failed to isolate a definitive cause. The network traffic patterns are highly variable, and the disruptions occur without a clear, predictable schedule. Management has emphasized the urgency of restoring stable connectivity, increasing the pressure on Anya to find a solution rapidly. Anya’s current troubleshooting methodology is proving insufficient given the ambiguous nature of the problem.

Which of the following actions best exemplifies Anya\'s adaptability and flexibility in response to this evolving and ambiguous network challenge?

Accepted Answer

Systematically exploring and implementing alternative diagnostic methodologies, such as deep packet inspection on selected flows during suspected disruption periods, analyzing control plane protocol states (e.g., BGP, OSPF neighbor adjacencies), and potentially engaging with application-level teams to correlate network events with application behavior.

Question 24

Anya, a network administrator at a growing tech firm, is investigating a persistent issue of elevated latency and intermittent packet loss affecting critical application traffic between two branch offices. The network segment utilizes OSPFv2 for routing. Initial diagnostics confirm that OSPF neighbor adjacencies are stable, and interface error counters show no significant anomalies. However, performance monitoring indicates that a recently upgraded 10 Gbps link between the offices is now carrying a disproportionately high volume of traffic compared to the older, but still functional, 1 Gbps links, leading to congestion on the faster link. This suggests a potential imbalance in how OSPF is selecting paths due to differing interface bandwidths. Which of the following actions would most effectively address this suboptimal path selection and improve overall network stability in this scenario?

Accepted Answer

Increase the OSPF reference bandwidth on all routers to a value that provides more granular cost differences between the 1 Gbps and 10 Gbps interfaces.

Question 25

Anya, a network administrator for a global enterprise, is alerted to widespread reports of intermittent network disruptions and sluggish application responsiveness affecting users in several key branch offices. The network relies on Cisco routing and switching infrastructure, with inter-branch connectivity facilitated by a combination of dedicated leased lines and VPN tunnels. Initial user feedback is varied, with some reporting complete outages while others describe slow performance. Anya must quickly identify the root cause and implement a resolution while minimizing business impact. Which of the following actions would be the most effective first step in Anya\'s diagnostic process?

Accepted Answer

Systematically verify the operational status, interface statistics, and configuration integrity of the core network devices and critical WAN links that interconnect the affected branch offices.

Question 26

Anya, a network engineer, is troubleshooting intermittent connectivity issues at a remote branch office. Users report sporadic inability to access shared resources and occasional slow performance. Initial observations suggest potential problems at both the data link and network layers, with some reports of duplicate IP addresses being assigned. Anya needs to implement a troubleshooting strategy that balances efficiency, accuracy, and minimal disruption to ongoing business operations. Which of the following approaches best reflects a robust and adaptable methodology for addressing this complex scenario?

Accepted Answer

Systematically isolate affected network segments and devices, verify IP addressing and routing configurations, and utilize diagnostic tools to pinpoint the root cause while minimizing user impact.

Question 27

Consider a scenario where a Cisco router, configured with EIGRP, has a primary path to a destination network with a reported distance of 120 and a feasible distance of 100. It also has a secondary path with a reported distance of 130. If the primary path link experiences a sudden physical failure, what is the most immediate and likely action the EIGRP process will take to restore connectivity to the destination network, assuming no other adjacent routers have a better feasible distance than the secondary path\'s reported distance?

Accepted Answer

Immediately install the secondary path into the routing table as it is the next best option.

Question 28

Anya, a seasoned network engineer, is tasked with deploying a new Quality of Service (QoS) policy across a critical enterprise network to ensure superior performance for real-time applications like Voice over IP (VoIP) while managing bandwidth for less time-sensitive data. She has a strong foundation in legacy QoS mechanisms but is encountering subtle performance degradations and unexpected traffic shaping behavior with the new integrated services framework. Anya suspects that the configuration, while technically compliant with the initial design, is not optimally tuned for the network\'s dynamic traffic patterns. She needs to iteratively refine the policy, potentially re-evaluating classification, marking, queuing, and shaping strategies, without causing significant service disruption. Which of the following behavioral competencies is most crucial for Anya to effectively navigate this evolving situation and achieve the desired network performance?

Accepted Answer

Adaptability and Flexibility

Question 29

A network administrator is configuring BGP on RouterA, which has established peering sessions with two neighboring routers, R1 and R2. Both R1 and R2 advertise the same destination network, 192.168.1.0/24. RouterA has received the following BGP update information for this network:

From R1: AS_PATH: 65002 65003, Local_Pref: 150, Origin: IGP, MED: 75
From R2: AS_PATH: 65004 65005, Local_Pref: 100, Origin: IGP, MED: 50

Given that RouterA is configured to use the default BGP path selection algorithm, which path will RouterA select as the best path to reach the 192.168.1.0/24 network?

Accepted Answer

The path advertised by R1 due to its higher Local Preference.

Question 30

Anya, a senior network engineer, is tasked with resolving a sudden and significant performance degradation impacting a core customer-facing e-commerce platform. Initial user reports are vague, mentioning intermittent slowness and occasional transaction failures. Anya has confirmed the issue is not directly related to server load or application code deployment. She suspects a network-related bottleneck or misconfiguration, but the exact nature of the problem remains elusive, with no specific error messages pointing to a single culprit. She must quickly restore service while maintaining transparency with management and the development team. Which of the following best describes the primary skill set Anya needs to effectively address this complex and ambiguous technical challenge?

Accepted Answer

A comprehensive blend of systematic problem-solving, adaptable technical diagnostic skills, proactive communication, and the ability to manage competing priorities under pressure.

ICND Interconnecting Cisco Networking Devices Part 2 Free Practice Test — 30 Questions

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