Pass the CompTIA CompTIA Network+ N10-009 Questions and answers with CertsForce

Nmap (Network Mapper) is a powerful network scanning tool used to discover hosts and services on a computer network. It can be used to identify which ports are open on a remote server, which can help diagnose access issues to services like a remote file server.

Port Scanning: Nmap can perform comprehensive port scans to determine which ports are open and what services are running on those ports.

Network Discovery: It provides detailed information about the host’s operating system, service versions, and network configuration.

Security Audits: Besides troubleshooting, Nmap is also used for security auditing and identifying potential vulnerabilities.

Network References:

CompTIA Network+ N10-007 Official Certification Guide: Covers network scanning tools and their uses.

Nmap Documentation: Official documentation provides extensive details on how to use Nmap for port scanning and network diagnostics.

Network+ Certification All-in-One Exam Guide: Discusses various network utilities, including Nmap, and their applications in network troubleshooting.

Broadcast traffic is sent to all nodes on the network. In a broadcast, a single packet is transmitted to all devices in the network segment. This is commonly used for tasks like ARP (Address Resolution Protocol) requests.

Broadcast Domain: All devices within the same broadcast domain will receive broadcast traffic.

Network Types: Ethernet networks commonly use broadcast traffic for certain functions, including network discovery and addressing.

IPv4 Broadcast: An IPv4 broadcast address (e.g., 255.255.255.255) ensures the packet is sent to all devices on the network.

Network References:

CompTIA Network+ N10-007 Official Certification Guide: Explains network traffic types, including broadcast, unicast, and multicast.

Cisco Networking Academy: Provides training on network communication methods and traffic types.

Network+ Certification All-in-One Exam Guide: Discusses different types of network traffic and their uses in various network scenarios.

Broadcast traffic is essential for network operations that require communication with all nodes, such as ARP requests or DHCP discovery messages.

Definition of RPO:

Recovery Point Objective (RPO) is a disaster recovery metric that describes the maximum acceptable amount of data loss measured in time. It indicates the point in time to which data must be recovered to resume normal operations after a disaster.

For example, if the RPO is set to 24 hours, then the business could tolerate losing up to 24 hours' worth of data in the event of a disruption.

Why RPO is Important:

RPO is critical for determining backup frequency and helps businesses decide how often they need to back up their data. A lower RPO means more frequent backups and less potential data loss.

Comparison with Other Metrics:

MTTR (Mean Time to Repair): Refers to the average time required to repair a system or component and return it to normal operation.

RTO (Recovery Time Objective): The maximum acceptable length of time that a computer, system, network, or application can be down after a failure or disaster occurs.

MTBF (Mean Time Between Failures): The predicted elapsed time between inherent failures of a system during operation.

How RPO is Used in Disaster Recovery:

Organizations establish RPOs to ensure that they can recover data within a timeframe that is acceptable to business operations. This involves creating a backup plan that meets the RPO requirements.

Power over Ethernet (PoE) delivers power to devices such as VoIP phones over the same cables used for data. If the total power requirement of connected devices exceeds the PoE power budget of the switch or injector, some devices may not receive adequate power and could intermittently reboot. This issue would not affect the workstation, which is likely receiving power separately. References: CompTIA Network+ Exam Objectives and official study guides.

Port 443 is used by HTTPS (Hypertext Transfer Protocol Secure), a secure version of HTTP that uses SSL/TLS to encrypt the communication between a client and server. This ensures confidentiality and integrity of data in transit. The document states:

“Port 443 is the default port for HTTPS, which secures HTTP traffic using SSL/TLS, providing encryption and secure identification of web servers.”

IPv4 addresses are divided into classes:

Class A: Supports 16,777,214 hosts (large enterprises).

Class B: Supports 65,534 hosts (medium to large networks).

Class C: Supports 254 hosts (small to medium networks).

Class D: Used for multicast, not for assigning IPs to hosts.

Step-by-step Calculation:

The network will have 150 users initially, with a projected growth of 10 users, totaling 160 users.

Each user has two devices, so 160 × 2 = 320 IP addresses needed.

A Class C subnet has 254 usable IPs by default, which is not sufficient.

A Class B subnet can support thousands of hosts, making it the most appropriate option.

Incorrect Options:

A. Class D: Reserved for multicast, not for host assignments.

C. Class A: Overkill for a network of this size.

D. Class C: Cannot support 320 hosts without subnetting, making Class B the best choice.

A Site-to-site VPN (Virtual Private Network) is the most cost-effective solution for establishing a persistent, secure connection between two facilities. It uses the public internet to create an encrypted tunnel, leveraging existing internet connections without requiring expensive dedicated infrastructure. This makes it ideal for organizations looking to securely connect remote sites while minimizing costs.

Why not GRE tunnel? Generic Routing Encapsulation (GRE) tunnels encapsulate traffic but do not provide encryption natively, requiring additional protocols (e.g., IPsec) for security. This adds complexity and is less cost-effective than a site-to-site VPN, which integrates encryption.

Why not VXLAN? Virtual Extensible LAN (VXLAN) is used for overlay networks in data centers to extend Layer 2 networks, not for secure site-to-site connectivity.

Why not Dedicated line? A dedicated line (e.g., leased line or MPLS) provides high reliability but is significantly more expensive due to the need for dedicated infrastructure.

A jump box is a hardened, isolated system that provides secure access to critical infrastructure devices like routers and firewalls.

Tailgating is a physical security breach where someone follows an authorized person into a restricted area without proper credentials. Once inside, the attacker can install rogue devices like unauthorized APs.

A. Evil twin is a wireless attack where an attacker sets up a fake AP.

B. Honeytrap is used to attract attackers for analysis.

C. Wardriving involves scanning for unsecured Wi-Fi networks while driving, not physical intrusion.

???? Reference:

CompTIA Network+ N10-009 Official Objectives: 4.2 – Identify common security threats and vulnerabilities.

A Security Information and Event Management (SIEM) system collects, correlates, and analyzes logs from multiple sources in real-time, providing enhanced visibility across multivendor environments.

Breakdown of Options:

A. SNMP – SNMP is used for network device monitoring, but it lacks real-time correlation across multiple vendors.

B. SIEM – Correct answer. SIEM aggregates, analyzes, and correlates logs from multiple sources, providing real-time visibility.

C. Nmap – Nmap is a network scanning tool used for mapping hosts and detecting open ports but does not provide log correlation.

D. Syslog – Syslog collects logs but does not correlate or analyze them in real-time.