Final answer:
The two types of packet filtering are stateful and stateless. Stateful packet filtering keeps track of the state of network connections, while stateless packet filtering does not.
Step-by-step explanation:
The correct answer is a) Stateful and stateless. Packet filtering is a technique used in computer networks to control and manage network traffic. It involves examining packets of data that pass through a network device, such as a router or firewall, and making decisions based on predetermined rules.
Stateful packet filtering is a type of packet filtering that keeps track of the state of network connections. It analyzes the context of packets by maintaining a record of previous packets and their states. This allows it to make more sophisticated decisions and provide better security.
Stateless packet filtering, on the other hand, does not keep track of the state of network connections. It simply examines individual packets based on their headers and predefined rules. While it is simpler and less resource-intensive, it may not provide the same level of security as stateful filtering.