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Prepare for the CompTIA Network+ Certification exam with our extensive collection of questions and answers. These practice Q&A are updated according to the latest syllabus, providing you with the tools needed to review and test your knowledge.
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The questions for N10-009 were last updated on Mar 30, 2025.
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Which of the following network ports is used when a client accesses an SFTP server?
Comprehensive and Detailed
SFTP (Secure File Transfer Protocol) operates over port 22, using SSH (Secure Shell) encryption for secure file transfers.
Breakdown of Options:
A . 22 -- Correct answer. SFTP runs over SSH (port 22) for secure file transfers.
B . 80 -- Used for HTTP, not SFTP.
C . 443 -- Used for HTTPS (secure web traffic).
D . 3389 -- Used for RDP (Remote Desktop Protocol).
CompTIA Network+ (N10-009) Official Study Guide -- Domain 3.1: Compare and contrast network protocols.
RFC 4253: SSH Transport Layer Protocol
A junior network technician at a large company needs to create networks from a Class C address with 14 hosts per subnet. Which of the following numbers of host bits is required?
A network engineer needs to virtualize network services, including a router at a remote branch location. Which of the following solutions meets the requirements?
Network Functions Virtualization (NFV): NFV is a technology that virtualizes network services like routing, firewalls, and load balancers. It allows these services to run on virtual machines rather than requiring dedicated hardware. This is ideal for remote branch locations where deploying physical devices is costly and complex.
VRF (B): Virtual Routing and Forwarding is used for segmenting routing tables but does not virtualize services.
VLAN (C): Virtual Local Area Networks help segregate broadcast domains but are unrelated to virtualizing network functions.
VPC (D): Virtual Private Cloud is used for cloud computing but does not pertain to virtualizing network services.
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A group of users cannot connect to network resources. The technician runs ipconfig from one user's device and is able to ping the gateway shown from the command. Which of the following is most likely preventing the users from accessing network resources?
A rogue DHCP server occurs when an unauthorized or misconfigured DHCP server assigns incorrect IP addresses, default gateways, or DNS settings to clients.
*In this scenario:
*The user can ping the gateway, meaning local network communication is working.
*However, they cannot access network resources, which suggests incorrect IP configuration (likely due to a rogue DHCP server assigning the wrong gateway or DNS).
*Why not the other options?
*VLAN hopping (A): This is an attack that exploits VLAN configurations to gain access to unauthorized VLANs. It would not typically cause multiple users to lose network access.
*Distributed DoS (C): A DDoS attack floods a network or service with traffic, but this issue is more likely misconfigured IP settings than an actual attack.
*Evil twin (D): This refers to a fraudulent Wi-Fi network mimicking a legitimate one. Since the users are on a wired network (ipconfig output checked), this is not applicable.
CompTIA Network+ (N10-009) Official Guide -- Chapter 11: Network Security Threats
Which of the following best describes the transmission format that occurs at the transport layer over connectionless communication?
At the transport layer, connectionless communication is typically handled using the User Datagram Protocol (UDP), which transmits data in units called datagrams. Unlike TCP, UDP does not establish a connection before sending data and does not guarantee delivery, making datagrams the correct term for the transmission format in this context. Reference: CompTIA Network+ Exam Objectives and official study guides.
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