H12211 HCIA Routing&Switching Free Practice Test — 30 Questions

Question 1

Anya, a network engineer, is troubleshooting sporadic connectivity disruptions affecting a remote branch office. After confirming that all physical cabling is sound and basic link-layer protocols are operational, the intermittent packet loss persists. Anya then proceeds to investigate the router\'s configuration to pinpoint the source of the Layer 3 communication breakdown. Which of the following diagnostic actions is most crucial for Anya to undertake at this stage to identify potential routing path or gateway misconfigurations?

Accepted Answer

Reviewing the router's routing table entries for relevant subnet reachability and validating the configured default gateway.

Question 2

Innovate Solutions Inc. experiences a sudden failure of its primary $1000$ Mbps fiber optic internet connection, which was actively used for BGP routing. A secondary $50$ Mbps DSL link is configured as a backup. Internally, the network employs Weighted Fair Queuing (WFQ) to prioritize real-time video conferencing traffic. Upon the primary link\'s failure, how will the router\'s behavior and the performance of the video conferencing application be affected, considering the QoS configuration and the reduced bandwidth of the backup link?

Accepted Answer

The router will automatically switch to the DSL link, and while video conferencing traffic will still be prioritized by WFQ, its performance will be limited by the $50$ Mbps capacity of the DSL link, potentially leading to degraded quality.

Question 3

A network engineer, Anya, is tasked with migrating a critical network segment from an outdated routing protocol to a more robust and scalable solution. Her team expresses significant apprehension regarding the transition, citing concerns about potential service disruptions and the steep learning curve associated with the new technology. Anya must not only manage the technical implementation but also overcome her team\'s resistance and ensure a smooth adoption. Which combination of behavioral competencies is most crucial for Anya to effectively navigate this situation and achieve a successful outcome?

Accepted Answer

Leadership Potential, Teamwork and Collaboration, and Communication Skills

Question 4

Anya, a network administrator for a growing enterprise, is troubleshooting performance issues in a newly established branch office. The network relies on multiple switches interconnected with redundant links to ensure high availability. During peak hours, users report sporadic packet drops and noticeable delays in application responsiveness. Upon investigation, Anya identifies that these disruptions coincide with minor link fluctuations within the switched network. The current configuration employs the traditional Spanning Tree Protocol (STP) to prevent bridging loops. Considering the impact of convergence time on network stability and application performance, what fundamental protocol enhancement would most effectively address these intermittent connectivity problems by significantly reducing the time it takes for the network to recover from topology changes?

Accepted Answer

Implementing Rapid Spanning Tree Protocol (RSTP)

Question 5

Anya, a network administrator for a growing online retailer, observes a significant performance degradation on their primary e-commerce website following a successful marketing campaign. Initial user reports indicate slow loading times and intermittent transaction failures. Anya\'s first intervention is to upgrade the main internet service provider (ISP) link to a higher-capacity circuit. While this provides a minor, short-lived improvement, the issues persist. Considering the HCIA Routing & Switching curriculum\'s emphasis on proactive and adaptive problem-solving in dynamic network environments, which of the following represents the most appropriate subsequent action for Anya to demonstrate effective adaptability and problem-solving abilities?

Accepted Answer

Implement Quality of Service (QoS) policies to prioritize critical e-commerce traffic and conduct a detailed analysis of internal network device utilization and routing table efficiency.

Question 6

An organization has been allocated the IP network address $192.168.1.0/24$ and needs to segment it to support three departments: Department Alpha requires 50 host IP addresses, Department Beta requires 25 host IP addresses, and Department Gamma requires 15 host IP addresses. Considering the principles of efficient IP address allocation and the need for potential future expansion, which subnet mask would best facilitate this network design while adhering to the HCIA Routing & Switching curriculum\'s emphasis on practical network planning?

Accepted Answer

$255.255.255.192$

Question 7

Consider a network administrator configuring Quality of Service (QoS) on a Cisco router. They have implemented a strict priority queue for Voice over IP (VoIP) traffic, assigning it the highest priority level. Concurrently, they have configured Weighted Fair Queuing (WFQ) for all other general data traffic, with specific weights assigned to different data sub-classes. If a VoIP packet and a general data packet arrive at the router\'s egress interface simultaneously, and the interface is currently operating at 80% of its capacity, what is the most likely outcome regarding the transmission order of these packets?

Accepted Answer

The VoIP packet will be transmitted immediately, followed by the general data packet according to its WFQ allocation.

Question 8

Anya, a network engineer for a financial services firm, is investigating a recurring connectivity problem affecting a proprietary trading application between two internal subnets. Users report intermittent failures to connect to the application server. Anya has meticulously verified that all end-host IP configurations, subnet masks, and default gateway settings are accurate. She has also confirmed that the Huawei AR router facilitating inter-subnet communication is functioning correctly, with no reported hardware faults or high resource utilization. The issue is specific to the trading application, which uses a range of UDP ports. What is the most logical and effective next step in Anya\'s troubleshooting process to pinpoint the root cause of this intermittent, application-specific connectivity failure?

Accepted Answer

Review and analyze the Access Control Lists (ACLs) applied to the router interfaces involved in the traffic path between the subnets.

Question 9

Anya, a network administrator, is tasked with optimizing real-time application performance on an enterprise network by implementing a Quality of Service (QoS) strategy. She identifies that voice-over-IP (VoIP) traffic requires strict low latency and jitter, while video conferencing traffic demands consistent bandwidth but can tolerate slightly more variation. Standard file transfer protocols should receive best-effort delivery. Anya decides to utilize a hierarchical queueing mechanism on Huawei networking equipment. Which combination of QoS mechanisms, applied in sequence from traffic classification to interface application, best addresses Anya\'s requirements for prioritizing VoIP and video conferencing traffic while ensuring efficient network resource utilization?

Accepted Answer

Traffic Classification using Access Control Lists (ACLs) and Layer 2/3/4 information, followed by Traffic Behavior Policies (TBPs) defining priority levels and bandwidth guarantees for each traffic class, and finally applying these TBPs to egress interfaces using a Low Latency Queuing (LLQ) discipline for VoIP and Assured Forwarding (AF) for video conferencing.

Question 10

Anya, a network engineer managing a complex enterprise network employing OSPF for routing, observes that a newly activated 10 Gbps link between two core routers, R1 and R2, is not being utilized for traffic between critical server segments, despite its superior bandwidth and a theoretically lower cost. She suspects that the OSPF cost calculation might be misconfigured, leading the Shortest Path First (SPF) algorithm to favor older, lower-bandwidth links. What is the most effective initial troubleshooting step Anya should undertake to rectify this situation, assuming OSPF neighbor adjacencies are correctly established?

Accepted Answer

Verify and adjust the OSPF reference bandwidth on R1 and R2 to better reflect the 10 Gbps link speed.

Question 11

Consider a complex enterprise network employing OSPFv2 where Area 1, connected to the backbone Area 0 via an Area Border Router (ABR), has implemented route summarization. The ABR for Area 1 is configured to advertise a summary route of $192.168.1.0/22$ representing several internal subnets. If a specific host route for $192.168.1.5/32$, previously advertised within Area 1, becomes unreachable due to a link failure, what will be the most accurate representation of the routing information within the Link State Database (LSDB) of routers in Area 0?

Accepted Answer

The LSDB in Area 0 will contain a Type 3 LSAs for the summarized prefix $192.168.1.0/22$.

Question 12

Consider a large enterprise network where several critical access layer links are prone to intermittent failures due to environmental factors. The network operations team has observed that these frequent link state changes are causing significant disruptions, including prolonged periods of unreachability for key services. They are evaluating different Interior Gateway Protocols (IGPs) to improve network stability and reduce convergence time during these transient outages. Which routing protocol\'s underlying algorithm is best suited to minimize the impact of frequent link state changes and ensure rapid re-establishment of network paths without overwhelming router resources?

Accepted Answer

Enhanced Interior Gateway Routing Protocol (EIGRP) due to its use of the Diffusing Update Algorithm (DUAL) for rapid convergence and backup path availability.

Question 13

Anya, a senior network engineer responsible for a critical enterprise network, observes a sudden and significant degradation in application performance, characterized by high latency and intermittent packet loss impacting several key client services. Simultaneously, her team is nearing the deadline for a major network infrastructure upgrade. Given these concurrent challenges, which course of action best exemplifies Anya\'s ability to balance immediate crisis management with ongoing strategic objectives, demonstrating adaptability and leadership potential?

Accepted Answer

Temporarily halt the network upgrade project to fully dedicate all available resources to diagnosing and resolving the performance degradation, while providing clear, concise updates to stakeholders on the revised upgrade timeline.

Question 14

Anya, a network engineer for a growing enterprise, is responsible for enhancing the network\'s performance for real-time communication applications. The company relies heavily on a VoIP system that experiences occasional degradation during peak hours due to high volumes of non-critical file transfers. Anya needs to implement a solution that ensures voice packets receive preferential treatment, minimizing latency and jitter, without completely starving other traffic. Which of the following Huawei QoS configurations would most effectively achieve this objective by segmenting and prioritizing traffic streams?

Accepted Answer

Implementing a traffic policy that classifies UDP traffic on ports 5060 and 10000-20000 as EF (Expedited Forwarding) and applies a strict priority queue to the egress interface of the core router.

Question 15

Anya, a network engineer, is troubleshooting an intermittent OSPF adjacency issue between a newly deployed branch router and the company\'s core network. The branch router\'s OSPF neighbor state with the core routers frequently flaps between \'Full\' and \'Down\', accompanied by a high volume of Link State Advertisement (LSA) retransmissions. Anya has confirmed basic IP reachability and that the network statements correctly include the relevant interfaces on both ends. What is the most probable underlying cause for this persistent instability, considering the described symptoms and common OSPF misconfigurations that prevent stable adjacencies?

Accepted Answer

Mismatched Maximum Transmission Unit (MTU) sizes on the interfaces participating in the OSPF domain.

Question 16

Anya, a senior network engineer for a large financial institution, observes a core routing device exhibiting a sudden and sustained 95% CPU utilization. The network experienced a minor, unrelated service disruption an hour prior, which was quickly resolved. Anya suspects a potential denial-of-service (DoS) attack due to the abrupt nature of the CPU spike. However, initial packet captures from an adjacent switch show no obvious patterns indicative of a volumetric attack. The router is critical for inter-branch communication and trading platforms. What is the most effective immediate action Anya should take to diagnose and mitigate the issue, considering the need for rapid resolution and minimal service impact?

Accepted Answer

Analyze the router's active session table and the CPU consumption breakdown by individual processes to pinpoint the exact source of the resource drain.

Question 17

In a large-scale enterprise network employing OSPF, a sudden physical link failure necessitates a routing recalculation. The network administrator observes a prolonged period of intermittent connectivity, impacting critical business operations. Which of the following actions, reflecting strong adaptability and problem-solving skills, would most effectively address the situation by minimizing convergence time and restoring stable network operation?

Accepted Answer

Proactively adjust OSPF timer values (e.g., LSA Retransmission Interval, SPF Delay) and analyze the routing table for potential LSA flooding issues to expedite convergence.

Question 18

Anya, a network engineer for a global investment bank, is alerted to a critical network disruption affecting inter-data center connectivity. Users report severe packet loss and high latency, impacting real-time trading operations. Initial diagnostics show that the primary routing protocol has converged, but traffic is being Black-holed on a specific high-capacity link. While the exact root cause is still under investigation, the business demands immediate action to restore some level of service. Anya has identified a less optimal but stable alternative path through a tertiary data center that could carry a portion of the critical traffic. This temporary reroute would involve modifying routing policies on several edge routers. What behavioral competency is Anya primarily demonstrating by choosing to implement this temporary reroute while deeper diagnostics are ongoing?

Accepted Answer

Pivoting strategies when needed

Question 19

Imagine a network engineer is troubleshooting connectivity issues between two subnets separated by a Huawei S5700 switch configured for routing. A packet originating from a host on the $192.168.1.0/24$ network, destined for a host on the $10.0.0.0/24$ network, arrives at the S5700\'s Vlanif interface for the $192.168.1.0/24$ subnet. The S5700\'s routing table has a direct route to the $10.0.0.0/24$ network via its Vlanif interface configured for that subnet. What is the fundamental basis upon which the S5700 will determine the egress interface for this packet to ensure successful delivery to the destination network?

Accepted Answer

The destination IP address, matching it against entries in its routing table to identify the optimal egress interface.

Question 20

Consider a scenario where a host on the 192.168.1.0/24 subnet needs to send a broadcast message that must be received by a host on the 192.168.2.0/24 subnet. The network infrastructure consists of Layer 2 switches connecting hosts within each subnet, and a router connecting these two subnets. Which network device and action is most crucial for ensuring this broadcast message effectively reaches its intended destination across the subnets?

Accepted Answer

The router, by performing a broadcast-to-unicast conversion to route the packet.

Question 21

Anya, a network engineer, is tasked with resolving a sudden and pervasive network slowdown impacting all users. Initial diagnostics on core routing devices and physical link statuses reveal no obvious faults. The issue manifests as intermittent packet loss and significantly reduced throughput across various network segments, making it difficult to pinpoint a single origin. Anya must quickly re-prioritize her work, adapt her troubleshooting methodology based on evolving, incomplete information, and maintain team morale while the problem persists. Which core behavioral competency is Anya most critically demonstrating in this evolving scenario?

Accepted Answer

Adaptability and Flexibility

Question 22

Consider a scenario where a critical enterprise network segment experiences a complete service interruption. Anya, the lead network engineer, arrives to find her team in a state of disarray, with members pursuing disparate troubleshooting paths, including checking physical cable integrity and rebooting unrelated devices. Initial reports from the client suggest a sudden, inexplicable failure. Anya quickly gathers the available diagnostic data, which, upon initial review, shows no physical layer anomalies but indicates anomalous traffic filtering patterns originating from a core routing device. Despite the team\'s initial focus on hardware, Anya directs them to concentrate on the configuration of the primary edge router serving the affected segment, specifically examining the access control lists. After a rapid, targeted review, it\'s discovered that an ACL, recently updated as part of a routine security policy enhancement, was inadvertently misconfigured, blocking all legitimate traffic to the segment. Anya oversees the immediate correction of this ACL rule, which promptly restores connectivity. Which behavioral competency was most critically demonstrated by Anya in resolving this network crisis?

Accepted Answer

Adaptability and Flexibility

Question 23

Consider a scenario where an enterprise network experiences intermittent packet loss on a critical data link between two core routers. Analysis of the link reveals it has a high bandwidth capacity (10 Gbps) but a recent, unconfirmed report suggests a slight degradation in its signal integrity, potentially impacting reliability. An alternative path exists with a lower bandwidth (1 Gbps) but is known to be exceptionally stable. If the network is configured with a standard link-state routing protocol that primarily uses bandwidth for metric calculation, what is the most prudent initial action for the network engineer to take to ensure optimal and reliable data flow?

Accepted Answer

Investigate the reported signal integrity issues on the high-bandwidth link and, if confirmed, adjust the routing protocol's metric calculation or implement policy-based routing to favor the stable, lower-bandwidth link for critical traffic.

Question 24

Anya, a network engineer, is troubleshooting intermittent connectivity between two subnets, $192.168.10.0/24$ and $192.168.20.0/24$, across a Huawei enterprise router. The network topology recently underwent a significant revision, including the renumbering of a critical intermediate segment. Anya has confirmed that the router has a static route configured for $192.168.20.0/24$ pointing to a next-hop IP address that is no longer active. Users in $192.168.10.0/24$ are experiencing packet loss when attempting to reach devices in $192.168.20.0/24$. What is the most appropriate and immediate action Anya should take to resolve this connectivity issue, demonstrating effective problem-solving and adaptability?

Accepted Answer

Update the existing static route entry to reflect the new next-hop IP address for the $192.168.20.0/24$ network.

Question 25

Anya, a network administrator, is troubleshooting a connectivity failure between devices residing in distinct subnets, which are intended to be segmented using VLANs 10 and 20 on a Huawei enterprise switch. Devices in VLAN 10 are unable to reach devices in VLAN 20, despite being on the same physical switch. Initial diagnostics reveal that the switch\'s uplink port, connecting to another switch in the network, is only configured to permit traffic for a single, unrelated VLAN. Furthermore, the ports assigned to the end devices in question are incorrectly configured, with some devices in VLAN 10 connected to ports designated for VLAN 30, and vice versa for devices in VLAN 20. Which of the following actions, when executed in conjunction, would most effectively restore communication between devices in VLAN 10 and VLAN 20, assuming the IP addressing and subnet masks are correctly configured on the end devices?

Accepted Answer

Configure the uplink interface as a trunk port permitting VLAN 10 and VLAN 20, and reassign the access ports to their correct VLAN memberships (ports for VLAN 10 devices to VLAN 10, and ports for VLAN 20 devices to VLAN 20).

Question 26

Anya, a network engineer responsible for deploying a new campus network infrastructure, is informed mid-project that a critical client has requested the immediate integration of a specialized VoIP service requiring a different Quality of Service (QoS) prioritization scheme than initially planned. This change necessitates a significant revision of the current network configuration and implementation timeline. Anya must quickly assess the impact, communicate the revised plan, and ensure her team remains aligned and productive despite the shift. Which combination of behavioral competencies is most crucial for Anya to effectively manage this situation and ensure successful project delivery?

Accepted Answer

Adaptability and Flexibility, Initiative and Self-Motivation, Communication Skills, and Leadership Potential

Question 27

Considering the intricate nature of network upgrades and the human element involved, which primary behavioral competency is most critical for Kai to demonstrate when faced with an aggressive timeline, unexpected hardware incompatibilities, and initial resistance from experienced team members during the implementation of a complex new Quality of Service policy?

Accepted Answer

Adaptability and Flexibility

Question 28

During a critical network infrastructure overhaul prompted by an unexpected cybersecurity directive that mandates a complete overhaul of inter-VLAN routing protocols to enhance data segmentation, an engineer is tasked with implementing a new, more granular policy-based routing solution. The original project timeline was focused on improving bandwidth utilization, but this new directive has abruptly shifted priorities. The engineer must quickly adapt to the new requirements, which involve unfamiliar configuration syntax and a less-documented command-line interface for the new routing devices. Which combination of behavioral competencies is MOST critical for the engineer to successfully navigate this transition and ensure network integrity and compliance?

Accepted Answer

Adaptability and flexibility, problem-solving abilities, and communication skills

Question 29

Anya, a network administrator for a large university, is responsible for optimizing the network connectivity for a new high-performance computing cluster housed in a research laboratory. The cluster requires extremely low latency and consistent high bandwidth to facilitate complex simulations. The existing campus network uses a hierarchical design, and the initial plan was to implement static routes between the lab\'s subnet and the rest of the campus network via the distribution layer switches. However, recent network performance reports indicate significant, unpredictable traffic fluctuations across campus, leading to intermittent congestion. Anya recognizes that relying solely on static routing might compromise the cluster\'s performance and create a single point of failure for routing information. Which routing strategy, when implemented at the distribution layer, would best address the research lab\'s stringent requirements and Anya\'s need for network adaptability in the face of evolving traffic patterns?

Accepted Answer

Implementing a dynamic routing protocol such as OSPF or EIGRP to automatically learn and adapt to network topology changes and traffic conditions.

Question 30

Considering a scenario where a network migration project faces an unforeseen critical hardware vulnerability, forcing a complete strategy pivot, which core behavioral competency is most directly and immediately tested for the project lead, Elara, in ensuring the project\'s continued progress and eventual success?

Accepted Answer

Adaptability and Flexibility

H12211 HCIA Routing&Switching Free Practice Test — 30 Questions

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