Practice Free N10-009 Exam Online Questions
Question #111
A network administrator needs to assign IP addresses to a newly installed network. They choose 192.168.1.0/24 as their network address and need to create three subnets with 30 hosts on each subnet.
Which of the following is a valid subnet mask that will meet the requirements?
- A . 255.255.255.128
- B . 255.255.255.192
- C . 255.255.255.224
- D . 255.255.255.240
Correct Answer: C
C
Explanation:
Understanding the Requirements
Network Address: 192.168.1.0/24
The /24 notation means a subnet mask of 255.255.255.0, providing 256 total addresses (192.168.1.0C192.168.1.255).
Usable hosts: 256 C 2 (network and broadcast) = 254.
Goal: Create 3 subnets, each with 30 hosts.
Each subnet needs enough addresses to accommodate 30 hosts, plus 2 reserved addresses (network and broadcast) per subnet.
Total addresses per subnet = 30 (hosts) + 2 (network/broadcast) = 32 addresses.
Subnetting Basics (Networking Fundamentals)
Subnet Mask: Determines how many bits are borrowed from the host portion to create subnets.
Original Mask: /24 (255.255.255.0) = 24 network bits, 8 host bits.
Formulae:
Number of subnets = 2^(number of borrowed bits).
Number of addresses per subnet = 2^(remaining host bits).
Usable hosts per subnet = 2^(remaining host bits) C 2.
We need:
At least 3 subnets.
At least 32 addresses per subnet (to fit 30 hosts + 2 reserved).
Step-by-Step Analysis
Determine Addresses Needed per Subnet:
32 addresses is a power of 2 (2^5 = 32).
This means each subnet requires 5 host bits (since 2^5 = 32 total addresses, and 32 C 2 = 30 usable hosts).
Calculate Remaining Bits:
Original network has 8 host bits (/24).
If 5 bits are left for hosts, we borrow: 8 C 5 = 3 bits for subnetting.
New Subnet Mask:
Original mask: /24 (24 network bits).
Borrow 3 bits: 24 + 3 = /27.
/27 = 255.255.255.224 (binary: 11111111.11111111.11111111.11100000).
Verify Requirements:
Number of Subnets: 2^3 = 8 subnets (meets the requirement of at least 3).
Addresses per Subnet: 2^5 = 32 addresses.
Usable Hosts per Subnet: 32 C 2 = 30 hosts (exactly meets the requirement).
Subnet Breakdown:
Increment: 256 C 224 = 32 (each subnet increments by 32 in the fourth octet).
Subnets:
C
Explanation:
Understanding the Requirements
Network Address: 192.168.1.0/24
The /24 notation means a subnet mask of 255.255.255.0, providing 256 total addresses (192.168.1.0C192.168.1.255).
Usable hosts: 256 C 2 (network and broadcast) = 254.
Goal: Create 3 subnets, each with 30 hosts.
Each subnet needs enough addresses to accommodate 30 hosts, plus 2 reserved addresses (network and broadcast) per subnet.
Total addresses per subnet = 30 (hosts) + 2 (network/broadcast) = 32 addresses.
Subnetting Basics (Networking Fundamentals)
Subnet Mask: Determines how many bits are borrowed from the host portion to create subnets.
Original Mask: /24 (255.255.255.0) = 24 network bits, 8 host bits.
Formulae:
Number of subnets = 2^(number of borrowed bits).
Number of addresses per subnet = 2^(remaining host bits).
Usable hosts per subnet = 2^(remaining host bits) C 2.
We need:
At least 3 subnets.
At least 32 addresses per subnet (to fit 30 hosts + 2 reserved).
Step-by-Step Analysis
Determine Addresses Needed per Subnet:
32 addresses is a power of 2 (2^5 = 32).
This means each subnet requires 5 host bits (since 2^5 = 32 total addresses, and 32 C 2 = 30 usable hosts).
Calculate Remaining Bits:
Original network has 8 host bits (/24).
If 5 bits are left for hosts, we borrow: 8 C 5 = 3 bits for subnetting.
New Subnet Mask:
Original mask: /24 (24 network bits).
Borrow 3 bits: 24 + 3 = /27.
/27 = 255.255.255.224 (binary: 11111111.11111111.11111111.11100000).
Verify Requirements:
Number of Subnets: 2^3 = 8 subnets (meets the requirement of at least 3).
Addresses per Subnet: 2^5 = 32 addresses.
Usable Hosts per Subnet: 32 C 2 = 30 hosts (exactly meets the requirement).
Subnet Breakdown:
Increment: 256 C 224 = 32 (each subnet increments by 32 in the fourth octet).
Subnets:
Question #112
A network administrator is conducting an assessment and finds network devices that do not meet standards.
Which of the following configurations is considered a set of rules that devices should adhere to?
- A . Production
- B . Backup
- C . Candidate
- D . Golden
Correct Answer: D
D
Explanation:
The correct answer is golden configuration. This is a reference standard or baseline that defines the approved settings and rules devices should follow. Any deviation from the golden configuration indicates drift or misconfiguration that must be remediated.
D
Explanation:
The correct answer is golden configuration. This is a reference standard or baseline that defines the approved settings and rules devices should follow. Any deviation from the golden configuration indicates drift or misconfiguration that must be remediated.
Question #113
Which of the following network ports is used when a client accesses an SFTP server?
- A . 22
- B . 80
- C . 443
- D . 3389
Correct Answer: A
A
Explanation:
SFTP (Secure File Transfer Protocol) operates over port 22, using SSH (Secure Shell) encryption for secure file transfers.
Breakdown of Options:
A
Explanation:
SFTP (Secure File Transfer Protocol) operates over port 22, using SSH (Secure Shell) encryption for secure file transfers.
Breakdown of Options:
Question #114
Which of the following network devices converts wireless signals to electronic signals?
- A . Router
- B . Firewall
- C . Access point
- D . Load balancer
Correct Answer: C
C
Explanation:
Role of an Access Point (AP):
Wireless to Wired Conversion: An access point (AP) is a device that allows wireless devices to connect to a wired network using Wi-Fi. It converts wireless signals (radio waves) into electronic signals that can be understood by wired network devices.
Functionality:
Signal Conversion: The AP receives wireless signals from devices such as laptops, smartphones, and tablets, converts them into electronic signals, and transmits them over the wired network.
Connectivity: APs provide a bridge between wireless and wired segments of the network, enabling seamless communication.
Comparison with Other Devices:
Router: Directs traffic between different networks and may include built-in AP functionality but is not primarily responsible for converting wireless to electronic signals.
Firewall: Protects the network by controlling incoming and outgoing traffic based on security rules, not involved in signal conversion.
Load Balancer: Distributes network or application traffic across multiple servers to ensure reliability and performance, not involved in signal conversion.
Deployment:
APs are commonly used in environments where wireless connectivity is needed, such as offices, homes, and public spaces. They enhance mobility and provide flexible network access.
Reference: CompTIA Network+ study materials on wireless networking and access points.
C
Explanation:
Role of an Access Point (AP):
Wireless to Wired Conversion: An access point (AP) is a device that allows wireless devices to connect to a wired network using Wi-Fi. It converts wireless signals (radio waves) into electronic signals that can be understood by wired network devices.
Functionality:
Signal Conversion: The AP receives wireless signals from devices such as laptops, smartphones, and tablets, converts them into electronic signals, and transmits them over the wired network.
Connectivity: APs provide a bridge between wireless and wired segments of the network, enabling seamless communication.
Comparison with Other Devices:
Router: Directs traffic between different networks and may include built-in AP functionality but is not primarily responsible for converting wireless to electronic signals.
Firewall: Protects the network by controlling incoming and outgoing traffic based on security rules, not involved in signal conversion.
Load Balancer: Distributes network or application traffic across multiple servers to ensure reliability and performance, not involved in signal conversion.
Deployment:
APs are commonly used in environments where wireless connectivity is needed, such as offices, homes, and public spaces. They enhance mobility and provide flexible network access.
Reference: CompTIA Network+ study materials on wireless networking and access points.
Question #115
Which of the following describes the best reason for using BGP?
- A . Preventing a loop within a LAN
- B . Improving reconvergence times
- C . Exchanging router updates with a different ISP
- D . Sharing routes with a Layer 3 switch
Correct Answer: C
C
Explanation:
BGP (Border Gateway Protocol) is used for routing data between different ISPs, making it essential for the functioning of the internet. Its primary use is for exchanging routing information between autonomous systems, especially different ISPs. Preventing loops within a LAN is handled by protocols like Spanning Tree Protocol (STP), while improving reconvergence times and sharing routes with a Layer 3 switch are functions of other protocols or internal mechanisms.
Reference: The CompTIA Network+ training emphasizes BGP’s role in the exchange of routing information across different ISPs and autonomous systems.
C
Explanation:
BGP (Border Gateway Protocol) is used for routing data between different ISPs, making it essential for the functioning of the internet. Its primary use is for exchanging routing information between autonomous systems, especially different ISPs. Preventing loops within a LAN is handled by protocols like Spanning Tree Protocol (STP), while improving reconvergence times and sharing routes with a Layer 3 switch are functions of other protocols or internal mechanisms.
Reference: The CompTIA Network+ training emphasizes BGP’s role in the exchange of routing information across different ISPs and autonomous systems.
Question #116
A technician is troubleshooting a user’s laptop that is unable to connect to a corporate server. The technician thinks the issue pertains to routing.
Which of the following commands should the technician use to identify the issue?
- A . tcpdump
- B . dig
- C . tracert
- D . arp
Correct Answer: C
C
Explanation:
The tracert (Traceroute) command is used to determine the path packets take from the source to the destination. It helps in identifying routing issues by showing each hop the packets pass through, along with the time taken for each hop. This command can pinpoint where the connection is failing or experiencing delays, making it an essential tool for troubleshooting routing issues.
Reference: CompTIA Network+ study materials and common network troubleshooting commands.
C
Explanation:
The tracert (Traceroute) command is used to determine the path packets take from the source to the destination. It helps in identifying routing issues by showing each hop the packets pass through, along with the time taken for each hop. This command can pinpoint where the connection is failing or experiencing delays, making it an essential tool for troubleshooting routing issues.
Reference: CompTIA Network+ study materials and common network troubleshooting commands.
Question #116
A technician is troubleshooting a user’s laptop that is unable to connect to a corporate server. The technician thinks the issue pertains to routing.
Which of the following commands should the technician use to identify the issue?
- A . tcpdump
- B . dig
- C . tracert
- D . arp
Correct Answer: C
C
Explanation:
The tracert (Traceroute) command is used to determine the path packets take from the source to the destination. It helps in identifying routing issues by showing each hop the packets pass through, along with the time taken for each hop. This command can pinpoint where the connection is failing or experiencing delays, making it an essential tool for troubleshooting routing issues.
Reference: CompTIA Network+ study materials and common network troubleshooting commands.
C
Explanation:
The tracert (Traceroute) command is used to determine the path packets take from the source to the destination. It helps in identifying routing issues by showing each hop the packets pass through, along with the time taken for each hop. This command can pinpoint where the connection is failing or experiencing delays, making it an essential tool for troubleshooting routing issues.
Reference: CompTIA Network+ study materials and common network troubleshooting commands.
Question #118
A network engineer wants to implement a new IDS between the switch and a router connected to the LAN. The engineer does not want to introduce any latency by placing the IDS in line with the gateway. The engineer does want to ensure that the IDS sees all packets without any loss.
Which of the following is the best way for the engineer to implement the IDS?
- A . Use a network tap.
- B . Use Nmap software.
- C . Use a protocol analyzer.
- D . Use a port mirror.
Correct Answer: D
D
Explanation:
Reference: CompTIA Network+ Certification Exam Objectives – Network Security section.
D
Explanation:
Reference: CompTIA Network+ Certification Exam Objectives – Network Security section.
Question #119
Which of the following ports is a secure protocol?
- A . 20
- B . 23
- C . 443
- D . 445
Correct Answer: C
C
Explanation:
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.”
C
Explanation:
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.”
Question #120
A technician needs to set up a wireless connection that utilizes MIMO on non-overlapping channels.
Which of the following would be the best choice?
- A . 802.11a
- B . 802.11b
- C . 802.11g
- D . 802.11n
Correct Answer: D
D
Explanation:
The 802.11n standard supports MIMO (Multiple Input Multiple Output), which allows multiple antennas to increase data throughput and improve reliability. Additionally, it uses non-overlapping channels in the 5 GHz band (and optionally the 2.4 GHz band), making it a good choice for high-speed, interference-resistant wireless connections. (Reference: CompTIA Network+ Study Guide, Chapter on Wireless Technologies)
D
Explanation:
The 802.11n standard supports MIMO (Multiple Input Multiple Output), which allows multiple antennas to increase data throughput and improve reliability. Additionally, it uses non-overlapping channels in the 5 GHz band (and optionally the 2.4 GHz band), making it a good choice for high-speed, interference-resistant wireless connections. (Reference: CompTIA Network+ Study Guide, Chapter on Wireless Technologies)