CompTIA N10-009 Online Practice Questions and Exam Preparation

CompTIA N10-009 Online Questions & Answers

• Question 251:

  Users are reporting latency on the network. The network engineer notes the following:

  Confirms the only change was a new network switch Confirms all users are experiencing latency Thinks the issue is a network loop caused by the lower bridge ID of the new switch

  Which of the following describes the next step in the troubleshooting methodology?

  A. Identify the problem.
  B. Test the theory.
  C. Implement the solution.
  D. Verify full system functionality.
  B. Test the theory.

  ---

  Explanation

  The correct answer is Test the theory, which aligns directly with the CompTIA Network+ N10-009 troubleshooting methodology. According to the official troubleshooting steps, once a problem has been identified and relevant information gathered, the next step is to establish a theory of probable cause and then test that theory to determine whether it is valid.

  In this scenario, the engineer has already completed the problem identification phase by confirming that all users are experiencing latency and correlating the issue with the installation of a new switch. The engineer has also formed a theory: that a network loop caused by the lower bridge ID of the new switch may be impacting Spanning Tree Protocol (STP), resulting in congestion and latency. Because this theory has already been developed, the next logical and required step is to test the theory-for example, by reviewing STP states, temporarily disabling ports, or adjusting bridge priorities.

  Implementing a solution would be premature without validating the theory, and verifying full system functionality occurs only after a fix has been applied. The Network+ objectives stress following a structured methodology to avoid unnecessary changes and minimize network disruption. Testing the theory ensures accuracy before corrective action is taken, reducing risk and downtime.

• Question 252:

  A network administrator recently configured an autonomous wireless AP and performed a throughput test via comptiaspeedtester.com. The result was 75 Mbps. When connected to other APs, the results reached 500 Mbps.

  Which of the following is most likely the reason for this difference?

  A. Channel width configuration
  B. DNS server issues
  C. Authentication failure
  D. Incorrect DHCP settings
  A. Channel width configuration

  ---

  Explanation

  The channel width (20 MHz vs. 40 MHz vs. 80 MHz) directly impacts Wi-Fi throughput. If the AP is configured with a narrow channel width (e.g., 20 MHz), maximum data rates will be significantly lower than other APs using wider channels (e.g., 80 MHz). This matches the scenario where one AP achieves only ~75 Mbps, while others reach 500 Mbps.

  Option B: DNS issues affect name resolution, not raw throughput.

  Option C: Authentication failure would prevent connection, not reduce throughput.

  Option D: DHCP issues would prevent obtaining an IP, not cause slower speeds.

  References:

  Domain: Network Troubleshooting -- Wireless throughput issues, channel width configuration.

• Question 253:

  A VoIP system is experiencing inconsistent packet arrival times, causing poor call quality.

  Which issue is occurring?

  A. Latency
  B. Jitter
  C. Bandwidth
  D. Throughput
  B. Jitter

• Question 254:

  Which of the following attacks would most likely cause duplicate IP addresses in a network?

  A. Rogue DHCP server
  B. DNS poisoning
  C. Social engineering
  D. Denial-of-service
  A. Rogue DHCP server

• Question 255:

  Which of the following allows an organization to map multiple internal devices to a single external-facing IP address?

  A. NAT
  B. BGP
  C. OSPF
  D. FHRP
  A. NAT

  ---

  Explanation

  NAT (Network Address Translation) allows multiple private IP addresses to share a single public IP when accessing the internet. This conserves public IPs and provides basic security by hiding internal addresses.

  Option B: BGP is a routing protocol.

  Option C: OSPF is a link-state IGP.

  Option D: FHRP provides redundant gateways, not IP sharing.

  References:

  Domain: Networking Concepts -- NAT, PAT, private-to-public IP mapping.

• Question 256:

  Which of the following attacks can cause users who are attempting to access a company website to be directed to an entirely different website?

  A. DNS poisoning
  B. Denial-of-service
  C. Social engineering
  D. ARP spoofing
  A. DNS poisoning

  ---

  Explanation

  Network segmentation involves dividing a network into smaller segments or subnets. This is particularly important when integrating OT (Operational Technology) devices to ensure that these devices are isolated from other parts of the network. Segmentation helps protect the OT devices from potential threats and minimizes the impact of any security incidents. It also helps manage traffic and improves overall network performance.

  References:

  CompTIA Network+ study materials.

• Question 257:

  Wireless devices are deployed in another country.

  What must be considered FIRST?

  A. WPA2
  B. Regulatory impacts
  C. Channel bonding
  D. SSID
  B. Regulatory impacts

• Question 258:

  Which of the following cloud platform technology characteristics would a quantum computing host most likely prioritize?

  A. Scalability
  B. Elasticity
  C. Multitenancy
  D. Cost
  B. Elasticity

  ---

  Explanation

  The best answer is B. Elasticity. Quantum computing workloads are highly specialized and often require access to extremely expensive, limited, and on-demand processing resources. In cloud terms, elasticity is the ability to rapidly allocate and release resources as demand changes. That makes it a strong fit for environments where usage may spike for short periods and then drop off again.

  A quantum host would not usually be designed around ordinary shared-office priorities. Instead, it would favor the ability to obtain powerful compute capacity exactly when needed, without keeping that level of capacity permanently assigned.

  That is the practical value of elasticity in a cloud model.

  Scalability is close, but it usually describes the broader ability to increase capacity over time or as demand grows. Elasticity is more specific to dynamic, responsive adjustment of resources, which matches specialized compute workloads much better. Multitenancy refers to multiple customers sharing underlying infrastructure, and cost is always important, but neither is the main technical characteristic being highlighted here.

  For exam purposes, when a scenario describes advanced or highly variable compute demand in the cloud, elasticity is usually the strongest answer because it focuses on rapid resource expansion and reduction as needed.

• Question 259:

  A network administrator configured a router interface as 10.0.0.95 255.255.255.240. The administrator discovers that the router is not routing packets to a web server with IP 10.0.0.81/28.

  Which of the following is the best explanation?

  A. The web server Is In adifferent subnet.
  B. The router interface isa broadcast address.
  C. The IP address spaceis a class A network.
  D. The subnet is in a private address space.
  B. The router interface isa broadcast address.

• Question 260:

  While deploying a new fleet of computers on a DHCP network, a network administrator notices that new computers cannot connect to the internet.

  Which of the following is most likely the problem?

  A. Incorrect default gateway
  B. Address pool exhaustion
  C. Duplicate IP address
  D. Incorrect subnet mask
  B. Address pool exhaustion

  ---

  Explanation

  The best answer is B. Address pool exhaustion. The key detail is that this started happening while deploying a new fleet of computers on a DHCP network. That strongly suggests the number of available leases in the DHCP scope has been used up. When no more addresses are available, new devices cannot obtain valid network settings and will fail to connect properly.

  This is a common issue when many systems are added at once. Existing devices may already be consuming most or all of the available leases, and the new clients are left without an address assignment. Without a valid IP configuration from DHCP, the computers will not be able to reach the local network or the internet in the normal way.

  The other choices are possible network problems in general, but they are less likely in this exact scenario. An incorrect default gateway or incorrect subnet mask would more often reflect a bad DHCP option or a misconfiguration affecting many clients in a different way. A duplicate IP address can affect connectivity, but it does not naturally match the clue about many new devices being added at once on a DHCP scope.

  When a question combines DHCP, many new clients, and sudden inability for new systems to connect, address pool exhaustion is the most likely cause.