CompTIA Network+ Certification N10-009 Practice Questions

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Total 600 questions
Question 1

A user connects to a corporate VPN via a web browser and is able to use TLS to access the internal financial system to input a time card. Which of the following best describes how the VPN is being used?



Answer : A


Question 2

A network technician needs to configure IP addressing in a Class C network with eight subnets total:

Three subnets for 60 hosts

Three subnets for 15 hosts

Two subnets for seven hosts

Which of the following solutions should the technician use to accomplish this task?



Answer : C

The correct answer is VLSM (Variable Length Subnet Masking). According to the CompTIA Network+ N10-009 objectives, VLSM allows a network administrator to create subnets of different sizes within the same network, making it ideal for environments where subnet host requirements vary.

In this scenario, the technician must support multiple subnet sizes---60 hosts, 15 hosts, and seven hosts---within a single Class C network. Using a single subnet mask for all eight subnets would either waste a large number of IP addresses or fail to meet host requirements. VLSM solves this problem by allowing each subnet to be assigned a custom subnet mask that closely matches its host needs, maximizing address efficiency.

CIDR enables classless addressing and route aggregation but does not, by itself, describe creating multiple subnet sizes within a single address block. APIPA is a self-assigned addressing mechanism used when DHCP fails and has no relevance to subnet design. RFC 1918 defines private IP address ranges but does not address subnetting strategies.

The Network+ objectives emphasize VLSM as a best practice for efficient IP address management, especially in enterprise environments where conserving address space and meeting diverse departmental requirements are critical. In this case, VLSM is the only solution capable of meeting all stated constraints.


Question 3

Users at a satellite office are experiencing issues when using videoconferencing. Which of the following should a technician focus on first to rectify these issues?



Answer : A

Quality of Service (QoS) is crucial for real-time services like video conferencing. It prioritizes voice and video packets over less critical traffic (like file downloads), reducing latency, jitter, and packet loss.

B . Network signal may apply to wireless, but it's not specific to video issues.

C . Time to live (TTL) affects packet lifespan, not performance or quality.

D . Load balancing manages traffic across multiple paths but doesn't prioritize real-time traffic like QoS does.

Reference:

CompTIA Network+ N10-009 Official Objectives: 3.6 -- Explain the characteristics of network topologies and types.


Question 4

A network administrator deployed wireless networking in the office area. When users visit the outdoor patio and try to download emails with large attachments or stream training videos, they notice buffering issues. Which of the following is the most likely cause?



Answer : C

The most likely cause of buffering issues when moving outdoors is signal degradation. Wireless signals weaken as they travel through obstacles such as walls, glass, and air, leading to weaker connections and reduced data rates.

Breakdown of Options:

A . Network congestion -- While congestion can slow down network speeds, it affects all users, not just those moving outdoors.

B . Wireless interference -- Interference is possible but is more likely caused by other wireless signals rather than outdoor movement.

C . Signal degradation -- Correct answer. Wireless signals weaken with distance and obstacles such as walls, reducing performance.

D . Client disassociation -- Disassociation occurs when clients lose connection to the AP, but the question states that users experience buffering, indicating they are still connected but with a weak signal.


CompTIA Network+ (N10-009) Official Study Guide -- Domain 1.6: Analyze wireless networking technologies.

IEEE 802.11 standards: Wi-Fi propagation characteristics

Question 5

Which of the following protocols uses the Dijkstra's Link State Algorithm to establish routes inside its routing table?



Answer : A

OSPF (Open Shortest Path First) is a link-state routing protocol that uses the Dijkstra algorithm, also known as the shortest path first (SPF) algorithm, to determine the most efficient routes.

From Andrew Ramdayal's guide:

''OSPF is a link-state routing protocol that provides fast, efficient path selection using the shortest path first (SPF) algorithm.''


Question 6

Which of the following should be configured so users can authenticate to a wireless network using company credentials?



Answer : D

RADIUS (Remote Authentication Dial-In User Service) is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for users who connect and use a network service. RADIUS is often used to manage access to wireless networks, enabling users to authenticate with their company credentials, ensuring secure access to the network.Reference: CompTIA Network+ study materials.


Question 7

A network administrator is reviewing a production web server and observes the following output from the netstat command:

Which of the following actions should the network administrator take to harden the security of the web server?



Answer : A

The netstat output shows that multiple ports are open, including Telnet (23), FTP (20), and TFTP (69), which are potential security risks. Disabling unused ports minimizes the attack surface, reducing security vulnerabilities.

Breakdown of Options:

A . Disable the unused ports -- Correct answer. Unused ports should be closed to prevent unauthorized access.

B . Enforce access control lists -- ACLs help control access but do not disable unnecessary services.

C . Perform content filtering -- Content filtering controls web traffic, not port security.

D . Set up a screened subnet -- A DMZ (screened subnet) improves security but does not address open ports.


CompTIA Network+ (N10-009) Official Study Guide -- Domain 3.4: Given a scenario, implement network security measures.

CIS Benchmark for Linux & Windows Server Hardening

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Total 600 questions