Cisco Certified Network Associate (CCNA) Free Practice Test — 30 Questions

Question 1

Anya, a network administrator for a growing e-commerce platform, observes a critical degradation in network performance. Users are reporting slow response times and intermittent connectivity issues. Initial diagnostics reveal an unusual spike in inbound traffic, but the source and nature of this spike are not immediately apparent. Anya must quickly devise a plan to stabilize the network while simultaneously investigating the root cause, all without a clear understanding of the full scope or duration of the event. Which behavioral competency is most critical for Anya to effectively manage this evolving and ambiguous situation?

Accepted Answer

Uncertainty Navigation

Question 2

Anya, a network administrator, was diligently working on configuring a Quality of Service (QoS) policy to enhance voice and video traffic prioritization for an upcoming company-wide remote work initiative. Suddenly, an urgent alert is triggered, indicating a critical zero-day exploit affecting the core network infrastructure. The security operations team requires immediate assistance to isolate the compromised segment and implement emergency patching, which will likely disrupt existing network operations and delay her QoS implementation. Which behavioral competency is Anya primarily demonstrating if she immediately re-prioritizes her tasks, collaborates with the security team to understand the scope of the threat, and proposes a phased approach to address both the security crisis and the QoS project with minimal impact?

Accepted Answer

Adaptability and Flexibility

Question 3

Anya, a network administrator for a large, geographically dispersed organization, has been tasked with enforcing a new company-wide cybersecurity mandate requiring the implementation of a specific, advanced encryption standard for all inter-departmental data transit. Several department heads have voiced significant concerns regarding potential operational disruptions, the time required for their teams to adapt to the new protocols, and the perceived complexity of the change. Anya must ensure compliance across all departments while minimizing negative impacts on productivity and maintaining positive inter-departmental relationships. Which core behavioral competency is most critical for Anya to effectively manage this multifaceted challenge?

Accepted Answer

Adaptability and Flexibility

Question 4

Anya, a network administrator, is troubleshooting a connectivity issue reported by Mr. Chen, a remote employee. Mr. Chen can access all internal company servers and resources without any problems, but he is unable to reach any external websites. Anya has already verified that Mr. Chen\'s device has a valid IP address, subnet mask, and default gateway configuration. She suspects the issue might be related to how the network handles requests for external resources. Which of the following diagnostic steps would be the most appropriate next action for Anya to take to isolate the cause of Mr. Chen\'s inability to access external websites?

Accepted Answer

Test the internal DNS server's ability to resolve external domain names by performing an `nslookup` command for a public website like `www.cisco.com`.

Question 5

Anya, a network administrator, is troubleshooting a persistent network connectivity issue affecting a critical branch office. Her initial plan involves a step-by-step verification of IP addressing, default gateways, and DNS resolution on affected client devices. After meticulously completing these steps, the clients still cannot access external resources. During her re-evaluation, she observes that a core router serving the branch office is exhibiting unusual, intermittent LED activity not documented in its standard operational status indicators. This deviation from expected behavior suggests a potential issue beyond the client-side configurations she initially focused on. What approach best demonstrates Anya\'s adaptability and problem-solving skills in this evolving situation?

Accepted Answer

Immediately escalate the issue to the vendor support team, providing only the initial troubleshooting steps completed.

Question 6

Anya, a network administrator for a growing e-commerce startup, is investigating reports of intermittent connectivity to a critical customer-facing web server. Users are experiencing dropped connections and slow response times, particularly during peak hours. Anya has confirmed that the server\'s network interface card is functioning correctly and its IP configuration is valid. She has also noted that while clients can often ping the server, the round-trip times fluctuate wildly, and occasional packet loss is observed. When attempting to ping the server\'s default gateway, she notices a similar pattern of intermittent failures and high latency. To efficiently identify the specific network segment or device responsible for these performance degradations and packet loss, which diagnostic tool would provide the most granular insight into the path taken by the network traffic?

Accepted Answer

Traceroute

Question 7

Anya, a network administrator for a rapidly growing e-commerce platform, notices a significant degradation in application response times and an increase in intermittent connectivity issues for their primary customer portal. The network infrastructure comprises Cisco routers and switches. Anya\'s immediate action is to systematically review interface error counters on core network devices, examine CPU and memory utilization across the network backbone, and perform traceroute commands to identify any potential bottlenecks or routing anomalies. What core behavioral competency is Anya primarily demonstrating through these initial diagnostic steps?

Accepted Answer

Problem-Solving Abilities

Question 8

Anya, a network administrator, is troubleshooting persistent, intermittent connectivity disruptions on a critical segment of the corporate network. She has identified that the current network relies entirely on manually assigned static IP addresses for all end devices. Considering the potential for configuration errors and the administrative burden, Anya is evaluating alternative IP addressing schemes to enhance stability and simplify management. Which fundamental network service, when implemented, would most effectively address the root causes of misconfiguration and streamline the process of IP address allocation for devices connecting to this segment?

Accepted Answer

Dynamic Host Configuration Protocol (DHCP)

Question 9

Consider a network segment where Router\_A, Router\_B, and Router\_C are interconnected. Router\_A and Router\_B share a direct link, while Router\_A and Router\_C also share a direct link. Router\_B and Router\_C do not have a direct link between them. If the direct link between Router\_A and Router\_B experiences a catastrophic failure, and all routers are configured with OSPF, which of the following best describes the immediate and subsequent actions taken by Router\_A and Router\_C to maintain network reachability for devices connected to them?

Accepted Answer

Router\_A will mark the routes learned via the failed link as inaccessible and send updated Link State Advertisements (LSAs) to Router\_C and other neighbors, prompting them to re-evaluate their routing tables and potentially establish new paths through Router\_C.

Question 10

Anya, a network administrator, is troubleshooting a persistent but intermittent connectivity problem at a remote branch office. Users are reporting sporadic packet loss and noticeable latency spikes, which are severely impacting their VoIP calls and access to critical business applications. Anya has already verified basic IP addressing and subnetting configurations and confirmed that the interfaces are administratively up. She needs to identify a diagnostic command that will provide granular insights into the operational state and potential error conditions of the network interfaces, which could be contributing to these intermittent performance degradations, rather than just static configuration details.

Accepted Answer

show interfaces

Question 11

Anya, a network administrator for a growing e-commerce firm, is tasked with enhancing network security by implementing stricter access controls across multiple core routers. Upon reviewing the current configuration, she discovers that the existing Access Control Lists (ACLs) are a complex, layered accumulation of past security adjustments, resulting in a significant number of redundant and potentially conflicting entries. This has led to intermittent connectivity issues for some business-critical applications. Anya\'s objective is to refactor these ACLs to be more efficient, easier to manage, and to eliminate the unintended traffic blocking, all while minimizing downtime. She begins by meticulously documenting each existing ACL, its associated interfaces, and its intended purpose, then analyzes the traffic patterns to identify which rules are truly necessary and which are either obsolete or can be merged. She plans to test the modified ACLs in a lab environment before applying them to the production network. Which of the following behavioral competencies is Anya primarily demonstrating through her methodical approach to resolving this network configuration challenge?

Accepted Answer

Problem-Solving Abilities

Question 12

Anya, a network engineer, is troubleshooting intermittent connectivity issues at a newly established remote office. Despite her efforts to manually adjust Access Control Lists (ACLs) based on observed traffic surges, the network performance continues to degrade unpredictably, impacting user productivity. The branch office network utilizes a mix of leased lines and VPN tunnels, with varying utilization levels throughout the day. Anya needs a solution that can dynamically adapt to these changing network conditions and ensure consistent connectivity without constant manual intervention. Which of the following network management approaches would best address Anya\'s challenge in this dynamic environment?

Accepted Answer

Implementing a dynamic routing protocol that automatically learns and adapts to network topology changes and link status.

Question 13

Consider a scenario where a network administrator for a small business notices intermittent connectivity issues for several workstations connected to a specific Cisco Catalyst switch. Upon reviewing the switch\'s logs, the administrator observes repeated messages indicating duplicate IP address detection on the switch\'s management interface. This situation disrupts normal network operations and requires swift resolution. Which of the following actions best demonstrates the administrator\'s adaptability, problem-solving, and communication skills in addressing this critical network event?

Accepted Answer

Immediately re-assign a new IP address to the switch's management interface and then initiate a proactive scan of the subnet to identify and reconfigure the other device using the original IP address, while simultaneously informing affected users about the ongoing network instability and the steps being taken for resolution.

Question 14

A network administrator is troubleshooting connectivity issues between two hosts residing in different VLANs on a corporate network. Host A is in VLAN 10, with an IP address of $192.168.10.5/24$, and Host B is in VLAN 20, with an IP address of $192.168.20.10/24$. Both VLANs are routed by a Cisco ISR router. If Host A sends a packet destined for Host B, what primary information does the router utilize to determine the outgoing interface for forwarding this packet?

Accepted Answer

The destination IP address and the router's routing table

Question 15

Anya, a network engineer, is tasked with configuring a Cisco ISR router to ensure that voice over IP (VoIP) and video conferencing traffic receive preferential treatment over standard data transfers during periods of high network utilization. She needs to implement a strategy that guarantees a minimum level of performance for these sensitive applications without completely starving other traffic. Which combination of Quality of Service (QoS) mechanisms, when applied in sequence and appropriately configured, would best achieve this objective by prioritizing real-time traffic and managing congestion?

Accepted Answer

Traffic classification and marking (e.g., DSCP EF for VoIP), followed by class-based weighted fair queuing (CBWFQ) to allocate bandwidth, and then policing for excess lower-priority traffic.

Question 16

Anya, a network administrator, is tasked with integrating a new router into an existing network that is experiencing intermittent connectivity problems. The new router\'s initial configuration is unknown, and Anya needs to establish secure management access and perform initial diagnostics without causing further network disruption. Which management approach should Anya prioritize to gain initial control and configure the router\'s basic operational parameters?

Accepted Answer

Connect via the console port to establish a direct, out-of-band management session.

Question 17

During a critical client demonstration, a network outage suddenly affects connectivity for the presentation team. Anya, the network engineer on duty, quickly diagnoses the issue to be a misconfigured access port on a distribution switch, preventing devices from joining the correct VLAN. The port, identified as GigabitEthernet0/1, was erroneously assigned to VLAN 50 instead of the intended VLAN 10. Which Cisco IOS command, when executed from the correct configuration mode, would Anya use to rectify this specific port\'s VLAN assignment and restore connectivity?

Accepted Answer

switchport access vlan 10

Question 18

Anya, a network administrator, is implementing a new network segmentation strategy using VLANs on a Cisco Catalyst 2960 series switch. After configuring several VLANs and setting up trunk links between switches using the 802.1Q protocol, the network begins experiencing unexpected broadcast storms and intermittent connectivity for users connected to different VLANs. Anya suspects a configuration error related to the new VLAN setup. What underlying network principle is most likely being violated, leading to these symptoms?

Accepted Answer

Spanning Tree Protocol (STP) is failing to prevent Layer 2 loops, causing broadcast traffic to circulate uncontrollably.

Question 19

Consider a network where a client in VLAN 10 needs to communicate with a server in VLAN 20. Both VLANs are configured on separate physical interfaces of a managed switch. The switch has a trunk link connecting it to a Cisco ISR router, which is configured with subinterfaces for both VLAN 10 and VLAN 20, each with a unique IP address. If the client in VLAN 10 sends a broadcast frame intended for a device in VLAN 20, which device in the network is primarily responsible for processing and potentially forwarding this broadcast, given the typical configuration for inter-VLAN communication?

Accepted Answer

The ISR router, specifically through its subinterface configured for VLAN 20.

Question 20

Anya, a network engineer, is troubleshooting an intermittent connectivity problem affecting a critical business application. Users report sporadic disruptions characterized by high latency and packet loss, particularly during periods of high network traffic. Anya has already verified the physical layer, checked interface error counters, and reviewed routing tables. While these checks revealed no obvious faults, the problem persists. Anya decides to implement a more granular approach to identify the root cause. Which of the following actions best exemplifies Anya\'s problem-solving approach in this scenario, demonstrating adaptability and technical proficiency?

Accepted Answer

Deploying a network monitoring tool to capture and analyze real-time traffic flows, focusing on packet loss patterns and protocol behavior to identify anomalies and misconfigurations.

Question 21

Anya, a network administrator, is facing a perplexing situation at a remote branch office where users are reporting sporadic network outages. The initial reports are vague, and the problem appears to shift its manifestation, sometimes affecting wired clients, other times wireless, and occasionally impacting specific applications. Anya has already performed basic checks, but the root cause remains elusive, and the IT manager has requested daily updates, even as the nature of the problem seems to evolve. Which behavioral competency is most critical for Anya to effectively manage this ongoing and ambiguous technical challenge?

Accepted Answer

Adaptability and Flexibility

Question 22

Elara, a seasoned network administrator, is assigned to lead a critical project migrating a company’s entire network infrastructure to a new cloud-based platform. Her prior experience has been exclusively with on-premises hardware and traditional network management tools. The project mandate is ambitious, with an aggressive timeline that leadership has indicated may shift due to external dependencies and evolving business requirements. Furthermore, during the initial planning phases, the chosen cloud provider introduces a novel, proprietary network orchestration tool that promises significant efficiency gains but requires a steep learning curve. Elara’s success hinges on her ability to quickly grasp these new cloud networking paradigms, adapt her methodologies to leverage the new orchestration tool, and maintain project momentum despite the inherent uncertainty and potential for scope adjustments. Which behavioral competency is most critical for Elara to effectively navigate this complex and evolving project?

Accepted Answer

Adaptability and Flexibility

Question 23

Anya, a network administrator for a growing tech startup, is responsible for securing the company\'s internal network. Currently, access to development servers and staging environments is managed using static Access Control Lists (ACLs) applied to the router interfaces that connect different VLANs. As the company expands and the number of development teams and their access requirements fluctuate, Anya finds it increasingly difficult and time-consuming to update these ACLs manually for every change in user roles or server access permissions. She needs a more efficient and scalable method to enforce granular, role-based access control without the overhead of frequent manual ACL modifications. Which of the following approaches would best address Anya\'s need for a more dynamic and manageable access control strategy?

Accepted Answer

Implement a Network Access Control (NAC) solution utilizing RADIUS or TACACS+ for centralized authentication and dynamic authorization based on user roles.

Question 24

Anya, a network administrator at a growing tech firm, is tasked with rolling out a critical network security policy update. This update involves reconfiguring firewall rules and implementing a new subnetting scheme across the organization. During a team meeting, a senior engineer, Ben, expresses significant apprehension, citing potential operational disruptions and a lack of clear communication regarding the necessity of these changes. Anya needs to manage this situation effectively to ensure a smooth transition. Which of Anya\'s behavioral competencies is most directly demonstrated by her proactive engagement with Ben to understand his concerns, explain the technical rationale behind the policy, and collaboratively adjust the implementation plan to address his feedback?

Accepted Answer

Demonstrating adaptability and effective communication by actively addressing concerns and collaboratively adjusting the implementation strategy.

Question 25

Anya, a network administrator, is faced with a sudden surge in network traffic, causing significant jitter and packet loss for VoIP calls. Her initial plan for implementing a standard QoS configuration to prioritize voice traffic needs to be rapidly adjusted due to the severity and immediacy of the degradation. Which behavioral competency is most critical for Anya to effectively manage this evolving and high-pressure situation to ensure minimal disruption to critical communication services?

Accepted Answer

Adaptability and Flexibility

Question 26

A network administrator is tasked with maintaining the stability of a corporate network. Recently, intermittent packet loss has been observed on a critical segment, impacting user experience. Initial troubleshooting efforts, including verifying physical layer integrity, checking interface statistics for errors, and confirming routing protocol adjacencies, have yielded no definitive cause. The packet loss does not correlate with specific application types, but its appearance coincided with the rollout of a new, resource-intensive cloud-based productivity suite. Given these circumstances, which of the following represents the most adaptive and effective strategic pivot for the administrator?

Accepted Answer

Initiate a comprehensive analysis of network traffic patterns and device resource utilization, specifically correlating performance metrics with the introduction and usage of the new cloud application to identify potential systemic bottlenecks or integration issues.

Question 27

A network administrator notices that a primary data path between two critical network segments, utilizing Router A and Router B, is experiencing increased latency and intermittent packet loss. This degradation is impacting application performance. If the network is configured with multiple routing protocols running simultaneously on all routers, which protocol\'s inherent mechanism is most likely to facilitate the quickest and most accurate rerouting of traffic away from this compromised link, assuming default metric calculations and configurations?

Accepted Answer

Open Shortest Path First (OSPF)

Question 28

Anya, a network administrator, was tasked with deploying a comprehensive intrusion detection system (IDS) across the enterprise network, a project with a projected completion date three weeks out. Suddenly, a critical business directive requires the immediate upgrade of the primary data center\'s core router to accommodate a new high-bandwidth service provider link, with a mandated go-live within 48 hours. Anya must now reassess her current workload and immediate operational demands. Which behavioral competency is most directly and critically being tested in Anya\'s immediate response to this directive?

Accepted Answer

Adaptability and Flexibility

Question 29

Anya, a network administrator, is tasked with deploying a new network-wide encryption protocol. Her initial plan involves a controlled, phased rollout over three weeks. However, midway through the first week, a series of critical network performance degradations occur across multiple segments, demanding immediate troubleshooting and resource allocation. Anya must decide how to best manage her time and resources to address the performance issues while still aiming to complete the security protocol deployment within a reasonable timeframe. Which of the following behavioral competencies is Anya most critically demonstrating if she effectively re-prioritizes her immediate tasks to address the network instability and then resumes the protocol deployment with minimal disruption?

Accepted Answer

Pivoting strategies when needed and maintaining effectiveness during transitions

Question 30

An administrator is configuring a network with multiple VLANs to enhance security and performance. A host in VLAN 10 (192.168.10.0/24) sends an ARP request to discover the MAC address of its default gateway, which resides on the same subnet. Which of the following accurately describes the path and propagation of this broadcast ARP request within the described network topology?

Accepted Answer

The ARP request will be forwarded by the switch to all ports within VLAN 10 and will not be forwarded by the router to VLAN 20.

Cisco Certified Network Associate (CCNA) Free Practice Test — 30 Questions

A lot more is already mapped out

About the Cisco Certified Network Associate (CCNA) Certification