A clientless VPN is a type of VPN that does not require a dedicated software client to be installed on the user's device. Instead, it uses a web browser as the VPN client and provides secure access to web-based applications or resources12.
A clientless VPN is suitable for scenarios where the user needs to access internal corporate resources that are web-based, such as intranet sites, webmail, or web portals12. This way, the user does not need to install or configure any additional software, and the VPN connection is established through the browser's SSL/TLS encryption12.
A clientless VPN is not suitable for scenarios where the user needs to access non-web-based applications or resources, such as file shares, remote desktops, or network printers12. For these scenarios, a full VPN client is required, which can create a secure tunnel for all network traffic from the user's device12.
Therefore, option A is the most appropriate use case for the deployment of a clientless VPN, as it provides secure web access to internal corporate resources.
The other options are not relevant to the use case of a clientless VPN, as they involve different types of VPN technologies or scenarios.
Option B is incorrect because NFV (Network Function Virtualization) is a technology that virtualizes network functions, such as firewalls, routers, or load balancers, and runs them on software platforms instead of dedicated hardware devices3 . NFV can improve security by reducing the attack surface, simplifying management, and enabling rapid deployment of security updates3 . However, NFV is not a type of VPN, and it does not provide secure access to internal corporate resources.
Option C is incorrect because connecting two data centers across the internet requires a site-to-site VPN, which is a type of VPN that creates a secure tunnel between two or more network locations, such as branch offices or data centers . A site-to-site VPN allows the network devices at each location to communicate with each other as if they were on the same local network . A site-to-site VPN requires a VPN gateway at each location, which can be a router, firewall, or VPN appliance . A site-to-site VPN is not a clientless VPN, and it does not involve web browsers or web-based applications.
Option D is incorrect because increasing VPN availability by using a SDWAN (Software-Defined Wide Area Network) technology is not a use case for a clientless VPN, but rather a benefit of using a SDWAN technology. A SDWAN is a technology that uses software to dynamically route network traffic over multiple WAN links, such as broadband, LTE, or MPLS . A SDWAN can improve VPN availability by providing redundancy, load balancing, and failover for VPN connections . A SDWAN can also simplify VPN deployment and management by using centralized policies and automation . However, a SDWAN is not a type of VPN, and it does not provide secure access to internal corporate resources.
Reference:
1: CompTIA Network+ N10-008 Study Guide, Chapter 7, Section 7.1, "VPN Concepts", page 381-382.
2: Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 7.1, "VPN Concepts", page 58.
3: CompTIA Network+ N10-008 Study Guide, Chapter 5, Section 5.2, "NFV", page 264-265.
4: Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 5.2, "NFV", page 38.
5: CompTIA Network+ N10-008 Study Guide, Chapter 7, Section 7.1, "VPN Concepts", page 383-384.
6: Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 7.1, "VPN Concepts", page 59.
7: CompTIA Network+ N10-008 Study Guide, Chapter 5, Section 5.3, "SDWAN", page 266-267.
8: Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 5.3, "SDWAN", page 39.

The software on the workstation should be configured to send the query to 10.1.2.255, which is the local subnet broadcast address. A broadcast address is a special address that allows a device to send a message to all devices on the same subnet. It is usually derived by setting all the host bits to 1 in the network address. In this case, the network address is 10.1.2.0/27, which has 27 network bits and 5 host bits. By setting all the host bits to 1, we get 10.1.2.31 as the broadcast address in decimal notation, or 10.1.2.255 in dotted decimal notation. Reference: https://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/13788-3.html

A network administrator would like to purchase a device that provides access ports to endpoints and has the ability to route between networks. This means that the device should be able to operate at both the data link layer (layer 2) and the network layer (layer 3) of the OSI model.
An IPS (intrusion prevention system) is a security device that monitors network traffic and blocks or modifies malicious packets. It operates at the application layer (layer 7) of the OSI model and does not provide access ports or routing functions1.
A Layer 3 switch is a device that combines the features of a switch and a router. It can forward frames based on MAC addresses at layer 2 and route packets based on IP addresses at layer 3. It also provides access ports to connect endpoints such as computers, printers, and servers. A Layer 3 switch is faster and more efficient than a router because it makes forwarding decisions in hardware using ASICs (application-specific integrated circuits)23.
A router is a device that connects different networks and routes packets based on IP addresses at layer 3. It does not provide access ports to endpoints, but rather interfaces to other networks. A router makes forwarding decisions in software, which is slower and less scalable than a Layer 3 switch23.
A wireless LAN controller is a device that manages and configures wireless access points (WAPs) in a wireless network. It operates at the data link layer (layer 2) and does not provide routing functions. It also does not provide access ports to endpoints, but rather wireless connections4.
Therefore, the best device for the network administrator to purchase is B. A Layer 3 switch, as it provides access ports to endpoints and has the ability to route between networks.
Reference:
Intrusion Prevention Systems - N10-008 CompTIA Network+ : 2.5
Interface Configurations - N10-008 CompTIA Network+ : 2.3
Quiz: CompTIA Network+ N10-008 Post-Assessment Quiz
Wireless LAN Controllers - N10-008 CompTIA Network+ : 2.4

A duplex mismatch is the most probable cause of the issues described, where the network connection experiences slow data transfers and intermittent lockups. This occurs when one device in a network connection operates in full-duplex mode and the other in half-duplex, leading to collisions and performance issues. In the scenario provided, the small switch taken from storage may not have been configured to match the duplex settings of the existing network, resulting in these data transfer issues. Other options like reversed TX/RX pinouts, cable crosstalk, or a failed transceiver would typically result in complete connection failures or consistent degradation, not intermittent issues as described.

A split-tunnel VPN is a VPN feature that allows remote users to access network resources while only redirecting necessary traffic through the VPN tunnel. A split-tunnel VPN enables users to choose which applications or websites to secure with the VPN and which to connect normally through the internet. This can improve performance, conserve bandwidth, and avoid compatibility issues with some services that depend on the user's location. A split-tunnel VPN can also allow users to access local devices or resources that are not accessible through the VPN.