Practice Free N10-009 Exam Online Questions
Early in the morning, an administrator installs a new DHCP server. In the afternoon, some users report they are experiencing network outages.
Which of the following is the most likely issue?
- A . The administrator did not provision enough IP addresses.
- B . The administrator configured an incorrect default gateway.
- C . The administrator did not provision enough routes.
- D . The administrator did not provision enough MAC addresses.
A
Explanation:
When a DHCP server is installed and not enough IP addresses are provisioned, users may start experiencing network outages once the available IP addresses are exhausted. DHCP servers assign IP addresses to devices on the network, and if the pool of addresses is too small, new devices or those renewing their lease may fail to obtain an IP address, resulting in network connectivity issues.
Reference: CompTIA Network+ study materials.
A customer is adding fiber connectivity between adjacent buildings. A technician terminates the multimode cable to the fiber patch panel. After the technician connects the fiber patch cable, the indicator light does not turn on.
Which of the following should a technician try first to troubleshoot this issue?
- A . Reverse the fibers.
- B . Reterminate the fibers.
- C . Verify the fiber size.
- D . Examine the cable runs for visual faults.
A
Explanation:
When working with fiber optic cables, one common issue is that the transmit (TX) and receive (RX) fibers might be reversed. The first step in troubleshooting should be to reverse the fibers at one end to ensure they are correctly aligned (TX to RX and RX to TX). This is a simple and quick step to rule out a common issue before moving on to more complex troubleshooting.
Reference: CompTIA Network+ study materials.
Which of the following types of network architecture typically uses leased lines to provide dedicated, private connections between multiple satellite offices and a head office?
- A . Mesh
- B . Point to point
- C . Hub and spoke
- D . Star
C
Explanation:
The correct answer is hub-and-spoke. In this design, the head office serves as the hub, and all satellite or branch offices (the spokes) connect directly to the hub using leased lines or VPNs. Communication between spokes typically passes through the hub, which centralizes connectivity and simplifies management.
Which of the following is a characteristic of the application layer?
- A . It relies upon other layers for packet delivery.
- B . It checks independently for packet loss.
- C . It encrypts data in transit.
- D . It performs address translation.
A
Explanation:
Introduction to OSI Model:
The OSI model is a conceptual framework used to understand network interactions in seven layers:
Physical, Data Link, Network, Transport, Session, Presentation, and Application.
Application Layer:
The application layer (Layer 7) is the topmost layer in the OSI model. It provides network services directly to end-user applications. This layer facilitates communication between software applications and lower layers of the network protocol stack.
Reliance on Other Layers:
The application layer relies on the transport layer (Layer 4) for data transfer across the network. The transport layer ensures reliable data delivery through protocols like TCP and UDP.
The network layer (Layer 3) is responsible for routing packets to their destination. The data link layer (Layer 2) handles node-to-node data transfer and error detection. The physical layer (Layer 1) deals with the physical connection between devices.
Explanation of the Options:
A network engineer is designing a secure communication link between two sites. The entire data stream needs to remain confidential.
Which of the following will achieve this goal?
- A . GRE
- B . IKE
- C . ESP
- D . AH
C
Explanation:
Definition of ESP (Encapsulating Security Payload):
ESP is a part of the IPsec protocol suite designed to provide confidentiality, integrity, and authenticity of data by encrypting the payload and optional ESP trailer.
Ensuring Confidentiality:
Encryption: ESP encrypts the payload, ensuring that the data remains confidential during transmission. Only authorized parties with the correct decryption keys can access the data.
Modes of Operation: ESP can operate in transport mode (encrypts only the payload) or tunnel mode (encrypts the entire IP packet), both providing strong encryption to secure data between sites.
Comparison with Other Protocols:
GRE (Generic Routing Encapsulation): A tunneling protocol that does not provide encryption or security features.
IKE (Internet Key Exchange): A protocol used to set up a secure, authenticated communications channel, but it does not encrypt the data itself.
AH (Authentication Header): Provides integrity and authentication for IP packets but does not encrypt the payload.
Implementation:
Use ESP as part of an IPsec VPN configuration to encrypt and secure communication between two sites. This involves setting up IPsec policies and ensuring both endpoints are configured to use ESP for data encryption.
Reference: CompTIA Network+ study materials on IPsec and secure communication protocols.
A network administrator needs to implement a solution to filter access to the internet.
Which of the following should the administrator most likely implement?
- A . Router
- B . Cloud gateway
- C . Proxy
- D . Intrusion detection system
C
Explanation:
A proxy server can filter internet access by controlling which websites or services users can reach. It enforces content policies and can provide caching and monitoring.
Users are experiencing significant lag while connecting to a cloud-based application during peak hours. An examination of the network reveals that the bandwidth is being heavily utilized. Further analysis shows that only a few users are using the application at any given time.
Which of the following is the most cost-effective solution for this issue?
- A . Limit the number of users who can access the application.
- B . Lease a Direct Connect connection to the cloud service provider.
- C . Implement QoS to prioritize application traffic.
- D . Use a CDN to service the application.
C
Explanation:
Quality of Service (QoS)is the best cost-effective solution. It prioritizes traffic based on application criticality. If the bandwidth is limited and only a few users are affected, prioritizing that application traffic can improve performance without needing costly bandwidth upgrades or direct connections.
Reference: Section 1.2 C Networking Appliances, Applications, and Functions C “Quality of Service (QoS)”
Users are experiencing significant lag while connecting to a cloud-based application during peak hours. An examination of the network reveals that the bandwidth is being heavily utilized. Further analysis shows that only a few users are using the application at any given time.
Which of the following is the most cost-effective solution for this issue?
- A . Limit the number of users who can access the application.
- B . Lease a Direct Connect connection to the cloud service provider.
- C . Implement QoS to prioritize application traffic.
- D . Use a CDN to service the application.
C
Explanation:
Quality of Service (QoS)is the best cost-effective solution. It prioritizes traffic based on application criticality. If the bandwidth is limited and only a few users are affected, prioritizing that application traffic can improve performance without needing costly bandwidth upgrades or direct connections.
Reference: Section 1.2 C Networking Appliances, Applications, and Functions C “Quality of Service (QoS)”
Users are experiencing significant lag while connecting to a cloud-based application during peak hours. An examination of the network reveals that the bandwidth is being heavily utilized. Further analysis shows that only a few users are using the application at any given time.
Which of the following is the most cost-effective solution for this issue?
- A . Limit the number of users who can access the application.
- B . Lease a Direct Connect connection to the cloud service provider.
- C . Implement QoS to prioritize application traffic.
- D . Use a CDN to service the application.
C
Explanation:
Quality of Service (QoS)is the best cost-effective solution. It prioritizes traffic based on application criticality. If the bandwidth is limited and only a few users are affected, prioritizing that application traffic can improve performance without needing costly bandwidth upgrades or direct connections.
Reference: Section 1.2 C Networking Appliances, Applications, and Functions C “Quality of Service (QoS)”
An investment bank is seeking a DR backup solution.
Which of the following provides the most cost-effective backup site?
- A . Hot
- B . Cold
- C . Cluster
- D . Warm
B
Explanation:
• Cold sites are the most cost-effective disaster recovery (DR) option since they require the least infrastructure investment. They provide space and power but no pre-configured systems.
• Hot sites (A) are fully operational and very expensive.
• Warm sites (D) offer some pre-configured hardware but still require setup, making them more costly than cold sites.
• Clusters (C) are active failover systems, not DR sites.
Reference: CompTIA Network+ N10-009 Official Documentation C Disaster Recovery & Business Continuity Planning.