Free CompTIA N10-008 Practice Exam with Questions & Answers | Set: 5

SFP+ is a type of optical transceiver that supports 10G single-channel transmission over fiber optic cables. SFP+ stands for small form-factor pluggable plus, and it is compatible with SFP slots on switches and routers.

• The netstat -n command displays active TCP connections, but addresses and port numbers are expressed numerically and no attempt is made to determine names12. This option can be useful for checking the output in integer form, as well as for avoiding possible delays caused by name resolution12.
• The netstat command without any parameters displays active TCP connections, but addresses and port numbers are resolved to their corresponding names, such as hostnames and service names12. This option can be less informative and more time-consuming than the -n option12.
• The netstat -a command displays all active TCP connections and the TCP and UDP ports on which the computer is listening12. This option can be useful for checking the availability and status of ports, but it does not show the output in integer form12.
• The netstat -e command displays Ethernet statistics, such as the number of bytes and packets sent and received12. This option can be useful for checking the network performance and utilization, but it does not show the network connections or their addresses and port numbers12.

References:

• 1: CompTIA Network+ N10-008 Study Guide, Chapter 5: Network Tools and Troubleshooting
• 2: netstat | Microsoft Learn
• : 28 Netstat Commands {A Comprehensive List With Examples} - phoenixNAP
• : How to Use the Netstat Command - Lifewire

The correct option for this scenario is E. Reservation. DHCP reservations allow the administrator to assign a specific IP address to a device based on its MAC address. This ensures that the device always receives the same IP address from the DHCP server.

• Dynamic assignment: This is the default behavior of DHCP, where IP addresses are assigned dynamically from a pool of available addresses.
• Static IP on the server: This is not related to DHCP reservations. A static IP address is manually configured on the device itself, not assigned by the DHCP server.
• IP helper: IP helper is used to forward DHCP requests across different subnets, but it doesn’t specifically address MAC-based IP assignment.
• Exclusion range: Exclusion ranges are used to prevent certain IP addresses from being assigned dynamically by DHCP. They do not assign specific IP addresses based on MAC addresses.
• Reservation: DHCP reservations allow the administrator to assign specific IP addresses to devices based on their MAC addresses. This ensures consistent IP assignments for specific devices.

References:

• CompTIA Network+ Certification Exam Objectives

DHCP scope exhaustion is the situation when a DHCP server runs out of available IP addresses to assign to clients. DHCP stands for Dynamic Host Configuration Protocol, which is a network protocol that automatically assigns IP addresses and other configuration parameters to clients on a network. A DHCP scope is a range of IP addresses that a DHCP server can distribute to clients. If the DHCP scope is exhausted, new clients will not be able to obtain an IP address and connect to the network. This can explain why the smart TV was not able to connect to the branch Wi-Fi on the first day, and why the bank laptop lost network access on the next day when the TV was connected. The technician should either increase the size of the DHCP scope or reduce the lease time of the IP addresses to avoid DHCP scope exhaustion. References: [CompTIA Network+ Certification Exam Objectives], DHCP Scope Exhaustion - What Is It? How Do You Fix It?

Channel overlap is a situation where multiple wireless networks use the same or adjacent frequency channels, causing interference and degradation of performance. According to the image, the corporate SSID is using channels 9, 10, 11, and 6, which are overlapping with each other and with other networks in the area. This can reduce the signal quality and strength, increase the noise and latency, and cause dropouts and connectivity issues. To avoid channel overlap, it is recommended to use non-overlapping channels, such as 1, 6, and 11, in the 2.4 GHz band, or to switch to the 5 GHz band if possible12.

References

1 - What happens when wifi channels overlap? - Server Fault

2 - Is it better to use a crowded 2.4GHz Wi-Fi channel 1, 6, 11 or “unused” 3, 4, 8, or 9? - Super User

This answer will help the organization to avoid expending resources on identifying non-relevant events, as the 404 errors on image files are not indicative of any security threat or issue, but rather a misconfiguration or a broken link on the web server. The 404 errors on image files are also very frequent and repetitive, as shown by the web server log, which can clutter the log and make it harder to spot any relevant events. By filtering out these errors, the analyst can focus on more important events and reduce the noise in the log.

The other answers are not as good as A, because they either do not address the problem of identifying non-relevant events, or they are based on incorrect assumptions or information. For example:

• B. Updating firewall rules to block 202.180.155.1 is not a good answer, because the IP address 202.180.155.1 is not doing anything malicious or suspicious, but rather requesting image files that do not exist on the web server. Blocking this IP address will not improve the security of the web server, but rather create unnecessary firewall rules and possibly deny legitimate access to the web server.
• C. Resyncing the network time server and monitoring logs for future anomalous behavior is not a good answer, because there is no evidence that the network time server is out of sync or causing any problems. The web server log shows that the entries are all within a few minutes of each other, which is normal and expected. Resyncing the network time server will not help the analyst to identify non-relevant events, but rather waste time and resources on an unrelated task.
• D. Checking with the penetration testing team to see if the team ran any scans on January 14, 2021 is not a good answer, because the web server log does not show any signs of a penetration test or a scan. The log shows only 404 errors on image files, which are not typical of a penetration test or a scan, which would usually target different types of files, ports, or vulnerabilities. Checking with the penetration testing team will not help the analyst to identify non-relevant events, but rather distract the analyst from the actual events and possibly create false alarms.

https://www.professormesser.com/network-plus/n10-008/n10-008-video/general-network-troubleshooting-n10-008/

802.1X is a standard that enables the use of an AAA server in a domain environment by providing port-based network access control. 802.1X authenticates users or devices before granting them access to the network resources, and can also authorize them based on their roles or policies. 802.1X can work with different AAA protocols, such as RADIUS or TACACS+, to communicate with the AAA server.

References:

• CompTIA Network+ N10-008 Certification Study Guide, page 211
• CompTIA Network+ N10-008 Cert Guide, Deluxe Edition, page 382
• Configuring AAA Services - Cisco3

According to the network troubleshooting methodology, the first step a network administrator should take is to identify the problem. This involves gathering information from the users, the network devices, and the symptoms of the issue. Identifying the problem helps to narrow down the scope and the possible causes of the network issue.

References

• 1: Network troubleshooting methodology | CompTIA Network+ N10-008 …
• 2: Chapter 21. A Network Troubleshooting Methodology - CompTIA Network+ …
• 3: Network Troubleshooting Methodology – N10-008 CompTIA Network+ : 5.1

An access control vestibule, also known as a mantrap, is a physical security access control system that consists of a small space with two sets of interlocking doors. The first set of doors must close before the second set opens, preventing unauthorized individuals from following authorized individuals into facilities with controlled access. This activity, also known as tailgating, results in unauthorized access to the facility. An access control vestibule can help deter and detect tailgating attempts, as well as provide a containment area while authorization for physical access is verified.

References

Access Control Vestibules: Types and Peculiarities

Mantrap (access control)

PE-3 (8): Access Control Vestibules

Spanning tree is a protocol that prevents network loops by dynamically disabling or enabling switch ports based on the network topology. Network loops can cause intermittent connectivity issues, such as broadcast storms, MAC address table instability, and multiple frame transmission. By enabling spanning tree, the network administrator can ensure that there is only one active path between any two network devices at any given time.

References:

• CompTIA Network+ N10-008 Certification Exam Objectives, page 91
• CompTIA Network+ Cert Guide: Switching and Virtual LANs, page 172

10GBASE-LR is the best choice for connecting two data centers that are 6.2 miles (10 km) apart via fiber, because it supports a maximum distance of 6.2 miles (10 km) over single-mode fiber. 10GBASE-SR and 1000BASE-SX are designed for short-range connections over multi-mode fiber, and they can only reach up to 1,312 feet (400 m) and 1,804 feet (550 m), respectively. 10000BASE-LX is a typo and does not exist as a standard.

References:

• Network Transceivers – CompTIA Network+ N10-007 – 2.11
• CompTIA Network+ Certification Exam Objectives2

STP (Spanning Tree Protocol) is a protocol that prevents loops in a network by placing some of the switch ports in different states, such as blocking, listening, learning, forwarding, or disabled. A port in the blocking state does not forward frames or participate in frame forwarding. A network engineer can reconfigure STP to change the port states and avoid blocking ports that are needed for trunking.

A client-to-site VPN and a split-tunnel VPN are the best options for designing a secure remote access scheme that meets the given requirements. A client-to-site VPN allows users at multiple locations to access corporate resources over the internet by creating a secure tunnel between their devices and a VPN concentrator on the corporate network1. A split-tunnel VPN allows the on-premises equipment to handle only the traffic that is destined for the corporate resources, while the non-corporate traffic is routed directly to the internet without passing through the VPN tunnel2. This reduces the bandwidth and processing load on the corporate network and improves the performance of the remote access.

References:

• Remote Access – N10-008 CompTIA Network+ : 4.41
• comptia Network+ : Remote Access Methods And Network Monitoring2

Asymmetric routing can occur when two routers have different paths for the same two hosts, resulting in increased latency and possible packet loss. According to the CompTIA Network+ Study Manual, “If the path from the source to the destination is not the same in both directions, the packets will take different routes and the latency can increase significantly.” To confirm this, the network administrator should check the routing tables on both sides of the connection and ensure that the same path is used in both directions.

When a user reports that internet access is not working, it is important to first determine if there have been any recent changes to the network or the user's computer that could have caused the issue. This could include changes to the network configuration, the installation of new software or hardware, or other events that could have impacted the user's ability to access the internet. By determining if anything has changed, the administrator can narrow down the possible causes of the issue and focus on addressing the most likely cause.