Answer:
The device that blocks or admits individual packets by examining information in the TCP and IP headers is a firewall. A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on an organization's previously established security policies. It inspects network traffic, looking for suspicious patterns or characteristics that indicate potential threats, and then blocks or allows the traffic accordingly. Firewalls can operate at different layers of the OSI model, including the network layer (Layer 3) and the transport layer (Layer 4), which correspond to the IP and TCP protocols, respectively. By examining the IP and TCP headers, a firewall can determine the source and destination addresses, ports, and other information about the network traffic and make decisions about whether to allow or block the traffic based on pre-defined rules.
Step-by-step explanation:
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