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A network administrator is reviewing a production web server and observes the following output from the netstat command:
Which of the following actions should the network administrator take to harden the security of the web server?
Comprehensive and Detailed
The netstat output shows that multiple ports are open, including Telnet (23), FTP (20), and TFTP (69), which are potential security risks. Disabling unused ports minimizes the attack surface, reducing security vulnerabilities.
Breakdown of Options:
A . Disable the unused ports -- Correct answer. Unused ports should be closed to prevent unauthorized access.
B . Enforce access control lists -- ACLs help control access but do not disable unnecessary services.
C . Perform content filtering -- Content filtering controls web traffic, not port security.
D . Set up a screened subnet -- A DMZ (screened subnet) improves security but does not address open ports.
CompTIA Network+ (N10-009) Official Study Guide -- Domain 3.4: Given a scenario, implement network security measures.
A user's VoIP phone and workstation are connected through an inline cable. The user reports that the VoIP phone intermittently reboots, but the workstation is not having any network-related issues Which of the following is the most likely cause?
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. Reference: CompTIA Network+ Exam Objectives and official study guides.
A network administrator is configuring a network for a new site that will have 150 users. Within the next year, the site is expected to grow by ten users. Each user will have two IP addresses, one for a computer and one for a phone connected to the network. Which of the following classful IPv4 address ranges will be best-suited for the network?
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.
CompTIA Network+ N10-009 Official Study Guide -- Chapter on IP Addressing and Subnetting
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
Network administrators are using the Telnet protocol to administer network devices that are on the 192.168.1.0/24 subnet. Which of the following tools should the administrator use to best identify the devices?
Telnet: Telnet is a protocol used to establish remote connections to devices for administration. It directly communicates with devices on the network and is the best tool for identifying and accessing devices that support it on the subnet.
dig (A): Used for DNS queries, unrelated to Telnet.
runap (B): Not a recognized tool in this context.
tracert (C): Tracks the path to a host but does not establish direct connections.
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