Practice Free N10-009 Exam Online Questions
Which of the following is the part of a disaster recovery (DR) plan that identifies the critical systems that should be recovered first after an incident?
- A . RTO
- B . SLA
- C . MTBF
- D . SIEM
A
Explanation:
RTO stands for Recovery Time Objective, which defines the maximum acceptable amount of time that a system, application, or function can be down after a failure or disaster. It helps prioritize which systems need to be recovered first based on their importance to business operations.
SLA (Service Level Agreement) refers to an agreement between a service provider and a customer regarding expected performance and availability, but it does not dictate recovery order.
MTBF (Mean Time Between Failures) is a measure of reliability and time between hardware or system failures.
SIEM (Security Information and Event Management) is a centralized tool for logging and alerting but not relevant to DR recovery prioritization.
Reference: CompTIA Network+ N10-009 Official Objectives: 4.4 C Summarize business continuity and disaster recovery concepts.
Which of the following is a type of NAC that uses a set of policies to allow or deny access to the network based on the user’s identity?
- A . Standard ACL
- B . MAC filtering
- C . 802.1X
- D . SSO
C
Explanation:
A company upgrades its network and PCs to gigabit speeds. After the upgrade, users are not getting the expected performance. Technicians discover that the speeds of the endpoint NICs are inconsistent.
Which of the following should be checked first to troubleshoot the issue?
- A . Speed mismatches
- B . Load balancer settings
- C . Flow control settings
- D . Infrastructure cabling grade
A
Explanation:
Speed Mismatches: If NICs are set to different speeds (e.g., 100 Mbps on one side and 1 Gbps on the other), performance will degrade. Ensuring consistent speed settings between devices is crucial for optimal performance.
Load balancer settings (B): Applies to server load distribution, not endpoint speed.
Flow control settings (C): Can affect performance but is secondary to speed mismatches. Infrastructure cabling grade (D): Relevant if the cables are unsuitable for gigabit speeds, but speed settings should be checked first.
Reference: CompTIA Network+ Official Study Guide, Domain 2.5 (Troubleshooting Network Issues).
Which of the following connector types is most commonly associated with Wi-Fi antennas?
- A . BNC
- B . SFP
- C . MPO
- D . RJ45
A
Explanation:
BNC (Bayonet NeillCConcelman) connectors are commonly used with coaxial cables in RF and wireless applications, including some older Wi-Fi antennas and specialized networking equipment.
The document says:
“BNC (Bayonet NeillCConcelman) connectors are typically used with coaxial cables, especially in radio frequency (RF) and some Wi-Fi antenna applications, providing a secure and quick connect/disconnect.”
A customer calls the help desk to report issues connection to the internet. The customer can reach a local database server. A technician goes to the site and examines the configuration:
Which of the following is causing the user’s issue?
- A . Incorrect DNS
- B . Unreachable gateway
- C . Failed root bridge
- D . Poor upstream routing
B
Explanation:
The customer can access local resources (a database server), which means local networking is working. However, the inability to reach the internet suggests an issue with the default gateway. If the default gateway is unreachable, packets will not be routed outside the local network.
Breakdown of Options:
A network administrator is troubleshooting a connectivity issue between two devices on two different subnets. The administrator verifies that both devices can successfully ping other devices on the same subnet.
Which of the following is the most likely cause of the connectivity issue?
- A . Incorrect default gateway
- B . Faulty Ethernet cable
- C . Wrong duplex settings
- D . VLAN mismatch
A
Explanation:
When two devices on different subnets are unable to communicate, but can communicate with other devices on their own subnet, the issue is most often related to routing. Devices on different subnets require a default gateway to route traffic between networks.
If the default gateway is incorrectly configured, the device won’t know how to reach other subnets. Faulty cables (Option B) or duplex mismatches (Option C) would likely cause connectivity issues even within the local subnet, which is not the case here.
VLAN mismatches (Option D) are typically issues with switch port configurations and would likely cause total loss of connectivity, including within the same subnet.
✅ So, the most probable and logical cause is an incorrect default gateway.
Reference: CompTIA Network+ N10-009 Official Study Guide ― Objective 2.4: "Compare and contrast routing technologies."
A network administrator is troubleshooting a connectivity issue between two devices on two different subnets. The administrator verifies that both devices can successfully ping other devices on the same subnet.
Which of the following is the most likely cause of the connectivity issue?
- A . Incorrect default gateway
- B . Faulty Ethernet cable
- C . Wrong duplex settings
- D . VLAN mismatch
A
Explanation:
When two devices on different subnets are unable to communicate, but can communicate with other devices on their own subnet, the issue is most often related to routing. Devices on different subnets require a default gateway to route traffic between networks.
If the default gateway is incorrectly configured, the device won’t know how to reach other subnets. Faulty cables (Option B) or duplex mismatches (Option C) would likely cause connectivity issues even within the local subnet, which is not the case here.
VLAN mismatches (Option D) are typically issues with switch port configurations and would likely cause total loss of connectivity, including within the same subnet.
✅ So, the most probable and logical cause is an incorrect default gateway.
Reference: CompTIA Network+ N10-009 Official Study Guide ― Objective 2.4: "Compare and contrast routing technologies."
Several users in an organization report connectivity issues and lag during a video meeting. The network administrator performs a tcpdump and observes increased retransmissions for other non-video applications on the network.
Which of the following symptoms describes the users’ reported issues?
- A . Latency
- B . Packet loss
- C . Bottlenecking
- D . Jitter
B
Explanation:
Packet loss occurs when network packets fail to reach their destination, leading to disruptions in connectivity and performance issues.
In this scenario:
Users report connectivity issues and lag during video meetings.
The administrator detects increased retransmissions in tcpdump, which is a strong indicator of lost packets that must be resent.
Video meetings are particularly sensitive to packet loss, leading to buffering, frozen screens, and dropped calls.
Latency (Option A) refers to delayed data transmission but does not necessarily cause retransmissions.
Bottlenecking (Option C) happens when a network component (e.g., router, switch) cannot handle the traffic load, but packet retransmissions are more directly related to packet loss.
Jitter (Option D) affects the consistency of packet arrival times, but the symptoms described here are more aligned with packet loss rather than timing variations.
Reference: CompTIA Network+ (N10-009) Official Study Guide C Section: Troubleshooting Connectivity Issues
Which of the following attacks utilizes a network packet that contains multiple network tags?
- A . MAC flooding
- B . VLAN hopping
- C . DNS spoofing
- D . ARP poisoning
B
Explanation:
VLAN hopping is an attack where an attacker crafts packets with multiple VLAN tags, allowing them to traverse VLAN boundaries improperly. This can result in gaining unauthorized access to network segments that are supposed to be isolated. The other options do not involve the use of multiple network tags. MAC flooding aims to overwhelm a switch’s MAC address table, DNS spoofing involves forging DNS responses, and ARP poisoning involves sending fake ARP messages.
Reference: According to the CompTIA Network+ course materials, VLAN hopping exploits the tagging mechanism in network packets to gain unauthorized access.
Following a fire in a data center, the cabling was replaced. Soon after, an administrator notices network issues.
Which of the following are the most likely causes of the network issues? (Select two).
- A . The switches are not the correct voltage.
- B . The HVAC system was not verified as fully functional after the fire.
- C . The VLAN database was not deleted before the equipment was brought back online.
- D . The RJ45 cables were replaced with unshielded cables.
- E . The wrong transceiver type was used for the new termination.
- F . The new RJ45 cables are a higher category than the old ones.
D,E
Explanation:
Unshielded cables (D) are more prone to interference and may not be suitable for certain environments, especially after a fire where interference could be heightened.
Using the wrong transceiver (E) for new terminations can lead to compatibility issues, causing network failures.