Important CompTIA N10-009 Exam Questions

Answer: B

Explanation:

The correct answer is B. An IDS is less disruptive during the initial deployment of the technology. An Intrusion Detection System (IDS) is designed to monitor and alert on suspicious activity, but it does not sit inline to actively block traffic the way an Intrusion Prevention System (IPS) does. Because of that, deploying an IDS usually has less immediate impact on production traffic. It can be introduced to observe network behavior and generate alerts without risking accidental interruption of legitimate communications.

That makes IDS a safer first step in many environments, especially when teams are still tuning signatures, thresholds, or alert rules. If an IPS is deployed too aggressively before it is properly tuned, it may block valid traffic and create service issues. An IDS avoids that risk because it focuses on visibility rather than enforcement.

The other options are weaker. A is not always guaranteed, since processing needs depend on implementation and traffic volume. C is not a defining advantage of IDS over IPS. D is also not reliable, because false positives can occur with either technology depending on configuration and signatures.

For Network+ study purposes, the standard advantage of IDS is that it is passive and less disruptive, especially during initial rollout and monitoring phases.

Answer: A

Explanation:

When configuring a firewall, the first step is identifying which ports, protocols, and services are required for normal business operations. This ensures only legitimate traffic is allowed. After establishing the required rules, a default deny rule is added for security.

B . Deny all rule is important, but it should come after defining required rules.

C . VPN access is a service to configure, but only after determining baseline needs.

D . Outbound traffic policies are part of refinement, not the first consideration.

Reference (CompTIA Network+ N10-009):

Domain: Network Security --- Firewall configuration, rule order, least privilege.

Answer: A

Explanation:

Port 22 is used for Secure Shell (SSH), which enables encrypted remote login and command execution on network devices.

Port 23 = Telnet (unencrypted)

Port 80 = HTTP

Port 123 = NTP

From Andrew Ramdayal's guide:

''SSH uses port 22 to provide secure command-line access to devices such as switches and routers. Unlike Telnet (port 23), SSH encrypts session traffic, making it the preferred method for remote administration.''

Answer: C

Explanation:

Link Aggregation Control Protocol, or LACP, is the correct technology because it allows multiple physical links between switches to operate as one logical link. This provides redundancy and can increase throughput by distributing traffic across bundled links. If one physical link in the bundle fails, traffic can continue over the remaining links. Since the bundled links are treated as a single logical connection, LACP also helps avoid Layer 2 switching loops that would otherwise occur if multiple independent trunk links were connected between the same switches.

The CompTIA Network+ N10-009 objectives include switching, trunking, redundancy, link aggregation, and loop prevention. LACP is based on IEEE 802.3ad/802.1AX and is commonly used between switches, servers, and network appliances to improve availability and bandwidth.

MDIX automatically adjusts transmit and receive pairs on copper Ethernet links, but it does not provide trunk redundancy or increased throughput. First Hop Redundancy Protocol provides default gateway redundancy, not trunk link aggregation. Spanning Tree Protocol prevents loops, but it may block redundant links and does not increase throughput. Therefore, LACP is the best answer.

Answer: C

Explanation:

Testing the theory to determine the cause is the troubleshooting step used to strategically eliminate possible causes before confirming the main source of the issue. After the problem is identified and a theory of probable cause is established, the technician must test that theory. If the test confirms the theory, the technician can move toward creating a plan of action. If the theory is not confirmed, the technician should establish a new theory or escalate the issue.

The CompTIA Network+ N10-009 troubleshooting methodology emphasizes a structured process to avoid guessing and unnecessary changes. Testing a theory may include checking configurations, replacing a suspected cable, reviewing logs, verifying connectivity, testing DNS resolution, checking VLAN assignments, or comparing results against known-good systems. This process helps narrow the issue by ruling out causes that do not match the evidence.

Identifying the problem is the first step and involves gathering information. Establishing a theory means forming a likely explanation. Establishing a plan of action happens after the cause is confirmed. Therefore, the step that best matches strategically eliminating known issues is testing the theory to determine the cause.