Which firewall feature is used to ensure that packets coming into a network are legitimate responses to requests initiated from internal hosts?stateful packet inspectionURL filteringapplication filteringpacket filtering
The firewall feature that is used to ensure that packets coming into a network are legitimate responses to requests initiated from internal hosts is stateful packet inspection.
Stateful packet inspection is a firewall technology that not only examines the individual packets of data but also keeps track of the state of a connection. It maintains information about the ongoing connections between internal and external hosts. By doing so, it can determine whether incoming packets are part of an established connection or if they are legitimate responses to requests initiated from within the network.
Stateful packet inspection firewalls monitor the state of a connection by examining various aspects of the network traffic, such as the source and destination IP addresses, port numbers, and the sequence numbers of packets. This allows the firewall to verify if incoming packets are in response to valid requests made by internal hosts.
By using stateful packet inspection, the firewall can ensure that only the expected responses to internal requests are allowed into the network, while blocking any unauthorized or malicious packets. This feature plays an essential role in improving network security by preventing unauthorized access and protecting against various network attacks.
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