Free CompTIA N10-008 Practice Exam with Questions & Answers | Set: 3

• The most likely cause of the problem is that the switch port that the new PC is connected to is configured with port security, which is a feature that limits the number of MAC addresses that can be learned on a port.
• Port security can prevent unauthorized devices from accessing the network by either shutting down the port or dropping the traffic from the unknown MAC address.
• Since the existing PC operates normally, it means that its MAC address is already authorized on the switch port, but the new PC’s MAC address is not.
• Therefore, the technician should contact the network team to either disable port security on the switch port or add the new PC’s MAC address to the authorized list.
• This will allow the new PC to get an IP address on the client’s VLAN and access the network resources.
• The other options are not relevant to the situation, as they do not address the root cause of the problem.

References:

• : CompTIA Network+ N10-008 Study Guide, Chapter 3, Section 3.4, “Port Security”, page 147-148.
• : Professor Messer’s CompTIA N10-008 Network+ Course Notes, Section 3.4, “Port Security”, page 30.
• : CompTIA Network+ N10-008 Study Guide, Chapter 2, Section 2.3, “DNS Concepts”, page 79-80.
• : CompTIA Network+ N10-008 Study Guide, Chapter 6, Section 6.2, “SIEM”, page 316-317.
• : CompTIA Network+ N10-008 Study Guide, Chapter 5, Section 5.1, “NetFlow”, page 262-263.

To troubleshoot high latency issues when accessing web servers, a technician should use tools like ping, nmap, and traceroute. Ping can verify the reachability of a server and measure round-trip time. Nmap can scan for open ports and detect services running on the server. Traceroute can identify the path traffic takes to reach the server and pinpoint where delays occur. References: CompTIA Network+ Certification Exam Objectives1.

An access control vestibule is a physical security mechanism that consists of a small room or chamber with two doors, one leading to the outside and one leading to the secure site. The doors are controlled by an electronic system that verifies the identity and authorization of the person entering before allowing access to the next door. A landing page is a web page that appears when a user clicks on a link or advertisement. A smart locker is a physical security mechanism that allows users to store and retrieve items using a code or biometric authentication. A firewall is a network security device that monitors and filters incoming and outgoing traffic based on predefined rules. References: [CompTIA Network+ Certification Exam Objectives], Domain 4.0 Network Operations, Objective 4.1: Explain the importance of documentation and diagrams, Subobjective: Physical security devices (locks, cameras, etc.)

An incorrect default gateway can cause a PC to not connect to the internet, because the default gateway is the device that routes traffic from the local network to other networks. If the PC has a wrong default gateway configured, it may not be able to reach the internet router or the IT network router. The technician can ping the PC from the human resources router because they are on the same local network, but not from the IT network router because they are on different networks.

A duplicate IP address can cause a PC to not communicate with other devices on the same network, because the IP address is the unique identifier of a device on a network. If two devices have the same IP address, they may cause IP conflicts and packet loss. However, a duplicate IP address would not prevent the technician from pinging the PC from the human resources router, because they are on the same network.

A misconfigured RIP can cause a router to not learn or advertise routes to other networks, because RIP is a routing protocol that dynamically exchanges routing information between routers. If a router has a wrong RIP configuration, it may not be able to reach or share routes with other routers. However, a misconfigured RIP would not affect the PC’s connectivity to the internet, because the PC does not use RIP.

An improper VLAN assignment can cause a PC to not communicate with other devices on the same or different networks, because a VLAN is a logical segmentation of a network that isolates traffic based on criteria such as function, security, or performance. If a PC is assigned to a wrong VLAN, it may not be able to access the resources or services that it needs. However, an improper VLAN assignment would not prevent the technician from pinging the PC from the human resources router, because they are on the same physical network.

References

What is a Default Gateway?

What’s an IP Conflict and How Do You Resolve It?

What is RIP (Routing Information Protocol)?

What is a VLAN? How to Set Up a VLAN Network

CompTIA Network+ Certification All-in-One Exam Guide, Eighth Edition (Exam N10-008)

• IGMP snooping is a feature that allows switches to monitor the IGMP (Internet Group Management Protocol) messages between hosts and multicast routers, and to learn which ports are interested in receiving which multicast groups.
• IGMP snooping can improve the network performance by reducing the unnecessary flooding of multicast traffic to all ports, and by forwarding it only to the ports that have requested it.
• IGMP snooping can also conserve bandwidth and CPU resources on the network devices and hosts, as they do not have to process unwanted multicast packets.
• IGMP snooping can be especially useful for streaming video applications, as they often use multicast to deliver the same content to multiple devices simultaneously.
• The other options are not relevant to addressing the issue of network performance degradation due to streaming video:
• CompTIA Network+ N10-008 Study Guide, Chapter 3: Network Protocols and Services, Section 3.2: Configure and Support IPv4 and IPv6, p. 179-180
• Professor Messer’s Network+ N10-008 Course Notes, Section 3.2: IPv4 and IPv6 Multicast, p. 37
• Professor Messer’s Network+ N10-008 Video Training Course, 3.2 IPv4 and IPv6 Multicast

Channel bonding is a technique that allows two or more adjacent channels to be combined into a wider channel, increasing the data rate and throughput of the wireless network. Channel bonding can improve the performance of the Wi-Fi network by utilizing more of the available spectrum and reducing interference from other devices. Channel bonding is supported by Wi-Fi 5 (802.11ac) and Wi-Fi 6 (802.11ax) standards.

References: CompTIA Network+ N10-008 Cert Guide, Chapter 4, Section 4.2

Traceroute is a network diagnostic tool that allows you to trace the path that network packets take from one device to another. By running traceroute to the file server, the technician can see the sequence of devices and networks that the packets pass through on their way to the file server. This can help the technician to determine if there is a problem with the network connection between the user's computer and the file server, or if the issue is with the file server itself.

The most accurate NTP (Network Time Protocol) time source that can be accessed across a network connection is the Stratum 1 device. Here’s why:

• Stratum 0 device: These are reference clocks, such as atomic clocks or GPS receivers, which directly measure time. They are not accessible over the network.
• Stratum 1 device: These are servers that synchronize their time with Stratum 0 devices. They are highly accurate and can be accessed over the network.
• Stratum 7 device: This is not a standard stratum level in NTP. The valid stratum levels are 0 to 16.
• Stratum 16 device: This is a reserved value and not used in practice.

Therefore, the correct answer is B. Stratum 1 device1.

The record type that would be used to define where SIP (Session Initiation Protocol) is found is A (Address). A record is a type of DNS (Domain Name System) record that maps a domain name to an IPv4 address. SIP is a protocol that enables voice over IP (VoIP) communication, such as voice calls or video conferencing. SIP uses domain names to identify endpoints or servers involved in a communication session. Therefore, an A record is needed to resolve the domain name of a SIP endpoint or server to its IPv4 address. References: CompTIA Network+ N10-008 Certification Study Guide, page 154; The Official CompTIA Network+ Student Guide (Exam N10-008), page 6-8.

Jumbo frames are Ethernet frames that can carry more than 1500 bytes of payload data. Jumbo frames can reduce the overhead and improve the throughput of large file transfers, as fewer frames are needed to send the same amount of data. Jumbo frames can be used to provide faster transfer times, as long as the network devices support them

Auto-MDIX (or medium dependent interface crossover) is a feature that automatically detects the type of cable connection and configures the interface accordingly (i.e. straight-through or crossover). This ensures that the connection between the two switches is successful. This is referenced in the CompTIA Network+ Study Manual, page 519.

The ARP table is a database that is used by a device to map MAC addresses to their corresponding IP addresses. When a device sends a packet to another device on the same network, it uses the MAC address of the destination device to deliver the packet. The ARP table allows the device to determine the IP address of the destination device based on its MAC address.

 Biometrics is a type of authentication that uses a person’s physical characteristics, such as fingerprints, iris, or face, to verify their identity. An access control vestibule is a small room or area that separates two spaces and allows only one person to enter or exit at a time. Biometrics in an access control vestibule is the most effective physical security method to prevent tailgating, which is the unauthorized entry of a person behind another person who has legitimate access.

References: Network+ Study Guide Objective 5.1: Summarize the importance of physical security controls.

A link-state algorithm is a routing algorithm that uses information about the state of each link in the network to calculate the shortest path from one node to every other node. A link-state algorithm requires each router to maintain a complete map of the network topology and exchange link-state advertisements with its neighbors periodically or when a change occurs. A link-state algorithm uses a mathematical formula called Dijkstra’s algorithm to find the shortest path based on the link costs. A link-state algorithm provides the fastest convergence time because it can quickly detect and adapt to network changes. References: [CompTIA Network+ Certification Exam Objectives], [Link-state routing protocol - Wikipedia]

• The question describes a scenario where a network event is causing all communication to stop, and the network administrator can only access the switch using the serial console port, not SSH.
• This suggests that the problem is related to the network layer or below, as SSH operates at the application layer and requires network connectivity to function.
• The port statistics show a huge discrepancy between the total receive and transmit rates, as well as the unicast and broadcast/multicast packets per second. This indicates that there is a lot of traffic being generated and forwarded within the network, but not reaching the intended destinations.
• The most likely cause of this excessive traffic is a switch loop, which occurs when there are multiple paths between switches that create a circular flow of data. Switch loops can cause broadcast storms, MAC address table instability, and network congestion, leading to network outages.
• To verify this, the network administrator should use a tool such as Spanning Tree Protocol (STP), which is designed to prevent and detect switch loops by blocking redundant links and electing a root bridge. STP can also provide information about the topology and status of the network, such as the root port, designated port, and blocked port for each switch. References:
• CompTIA Network+ N10-008 Study Guide, Chapter 2, Section 2.3, Switching Technologies, page 741
• Professor Messer’s CompTIA N10-008 Network+ Course Notes, Section 2.3, Switching Technologies, page 132
• Professor Messer’s CompTIA N10-008 Network+ Training Course, Video 2.3 - Switching Technologies, 12:00 - 14:003