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These CompTIA Network+ Certification Exam (N10-009) practice test questions are customizable and give real CompTIA Network+ Certification Exam (N10-009) exam experience. Windows computers support desktop software. The web-based N10-009 Practice Exam is supported by all browsers and operating systems.
| Section | Objectives |
|---|---|
| Network Security | - Security concepts and threats - Access control and authentication - Network hardening techniques |
| Network Implementation | - Routing technologies - Switching technologies - Wireless networking - Network storage and virtualization |
| Network Operations | - Monitoring and optimization - Network documentation and diagrams - Business continuity and disaster recovery |
| Network Troubleshooting | - Tools and diagnostic techniques - Common network issues - Troubleshooting methodology |
| Networking Concepts | - IPv4 and IPv6 addressing - OSI model and TCP/IP model - Network topologies and types (LAN, WAN, WLAN) - Ports, protocols, and services |
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NEW QUESTION # 328
A network engineer connects a business to a new ISP. A simple ping test to 8.8.8.8 is successful. However, users complain of extreme slowness to any website and periods of no connectivity. Which of the following is the most likely cause?
Answer: C
Explanation:
If the business shares or duplicates the ISP-assigned public IP address, routing instability and conflicts will occur. Pinging a public IP like 8.8.8.8 may work (since ICMP can bypass certain conflicts), but browsing websites (which requires stable sessions and return traffic) will fail intermittently.
A). If the default gateway were incorrect, no external connectivity would work at all.
B). VLAN mismatch is an internal issue, not affecting ISP routing.
C). Subnet mask misconfiguration would prevent consistent routing but usually blocks ping too.
References (CompTIA Network+ N10-009):
Domain: Network Troubleshooting - Internet connectivity issues, ISP IP conflicts.
NEW QUESTION # 329
An administrator needs to configure an IoT device with a /21 subnet mask, but the device will only accept dotted decimal notation. Which of the following subnet masks should the administrator use?
Answer: B
Explanation:
A /21 subnet mask means 21 bits are network bits:
8 + 8 + 5 = 21 → leaves 11 bits for hosts.
Subnet mask in binary: 11111111.11111111.11111000.00000000
Converted to decimal: 255.255.248.0
Therefore:
A . /19 = 255.255.224.0
B . /20 = 255.255.240.0
✅ C . /21 = 255.255.248.0 ← correct
D . /22 = 255.255.252.0
Answer correction: The correct option is C. 255.255.248.0, not B.
Reference (CompTIA Network+ N10-009):
NEW QUESTION # 330
A network technician was recently onboarded to a company. A manager has tasked the technician with documenting the network and has provided the technician With partial information from previous documentation.
Instructions:
Click on each switch to perform a network discovery by entering commands into the terminal. Fill in the missing information using drop-down menus provided.
Answer:
Explanation:
See the Explanation for detailed information on this simulation.
Explanation:
(Note: Ips will be change on each simulation task, so we have given example answer for the understanding) To perform a network discovery by entering commands into the terminal, you can use the following steps:
Click on each switch to open its terminal window.
Enter the command show ip interface brief to display the IP addresses and statuses of the switch interfaces.
Enter the command show vlan brief to display the VLAN configurations and assignments of the switch interfaces.
Enter the command show cdp neighbors to display the information about the neighboring devices that are connected to the switch.
Fill in the missing information in the diagram using the drop-down menus provided.
Here is an example of how to fill in the missing information for Core Switch 1:
The IP address of Core Switch 1 is 192.168.1.1.
The VLAN configuration of Core Switch 1 is VLAN 1: 192.168.1.0/24, VLAN 2: 192.168.2.0/24, VLAN 3:
192.168.3.0/24.
The neighboring devices of Core Switch 1 are Access Switch 1 and Access Switch 2.
The interfaces that connect Core Switch 1 to Access Switch 1 are GigabitEthernet0/1 and GigabitEthernet0/2.
The interfaces that connect Core Switch 1 to Access Switch 2 are GigabitEthernet0/3 and GigabitEthernet0/4.
You can use the same steps to fill in the missing information for Access Switch 1 and Access Switch 2.
NEW QUESTION # 331
Which of the following allows an organization to map multiple internal devices to a single external-facing IP address?
Answer: B
Explanation:
NAT (Network Address Translation) allows multiple private IP addresses to share a single public IP when accessing the internet. This conserves public IPs and provides basic security by hiding internal addresses.
B . BGP is a routing protocol.
C . OSPF is a link-state IGP.
D . FHRP provides redundant gateways, not IP sharing.
Reference (CompTIA Network+ N10-009):
NEW QUESTION # 332
Which of the following technologies are X.509 certificates most commonly associated with?
Answer: A
Explanation:
PKI: X.509 certificates are a fundamental component of PKI, used to manage encryption keys and authenticate users and devices.
Digital Certificates: They are used to establish secure communications over networks, such as SSL/TLS for websites and secure email communication.
Authentication and Encryption: X.509 certificates provide the means to securely exchange keys and verify identities in various applications, ensuring data integrity and confidentiality.
Network Reference:
CompTIA Network+ N10-007 Official Certification Guide: Covers PKI and the role of X.509 certificates in network security.
Cisco Networking Academy: Provides training on PKI, certificates, and secure communications.
Network+ Certification All-in-One Exam Guide: Explains PKI, X.509 certificates, and their applications in securing network communications.
NEW QUESTION # 333
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