The NetworkScanner class uses which type of request to identify live hosts?

The NetworkScanner class typically utilizes ARP (Address Resolution Protocol) requests to identify live hosts on a local network. ARP requests work by sending a query to the local network to determine the link-layer address (MAC address) that corresponds to a given IP address. Devices on the network respond with their MAC addresses, allowing the scanner to identify which IP addresses are currently assigned to live devices on that network.

This method is particularly effective in local area networks (LANs) because ARP operates at the data link layer, making it capable of discovering hosts in the same subnet efficiently. In contrast, ICMP requests, while also used for network discovery (such as with ping), are generally not as effective in LAN environments where ARP is predominant for mapping the IP-MAC address relationships.

HTTP and DNS requests serve different purposes — HTTP is a protocol for transmitting web pages and data, while DNS is responsible for translating domain names into IP addresses. Neither of these protocols is primarily used for identifying live hosts on a network.