Which of the following works as a protocol for providing secure communications between wireless clients and wireless access points?
A.
Virtual Private Network
B.
Firewall
C.
Packet filtering
D.
Robust Secure Network
Explanation:
Robust Security Network (RSN) is a protocol for establishing secure communications between wireless clients and wireless access points (WAPs). It is a part of the 802.11i standard. The RSN protocol functions are as follows: The wireless client sends a probe request frame. As a response, the wireless access point (WAP) sends a probe response frame with an RSN information exchange (IE) frame. Now, the wireless client requests for authentication and sends an association request frame. As a response, the wireless access point (WAP) sends an association response frame. Answer option C is incorrect. Packet filtering is a method that allows or restricts the flow of specific types of packets to provide security. It analyzes the incoming and outgoing packets and lets them pass or stops them at a network interface based on the source and destination addresses, ports, or protocols. Packet filtering provides a way to define precisely which type of IP traffic is allowed to cross the firewall of an intranet. IP packet filtering is important when users from private intranets connect to public networks, such as the Internet. Answer option B is incorrect. A firewall is a tool to provide security to a network. It is used to protect an internal network or intranet against unauthorized access from the Internet or other outside networks. It restricts inbound and outbound access and can analyze all traffic between an internal network and the Internet. Users can configure a firewall to pass or block packets from specific IP addresses and ports. Answer option A is incorrect. A Virtual Private Network (VPN) is a computer network that is implemented in an additional software layer (overlay) on top of an existing larger network for the purpose of creating a private scope of computer communications or providing a secure extension of a private network into an insecure network such as the Internet. The links between nodes of a Virtual Private Network are formed over logical connections or virtual circuits between hosts of the larger network. The Link Layer protocols of the virtual network are said to be tunneled through the underlying transport network.