Which type of firewall keeps a *table* tracking each network connection between internal and external systems?

Which type of firewall keeps a table tracking each network connection between internal and external systems? Stateful Packet Filtering Screening Firewalls Proxying Firewalls Bastion Host Packet Filtering What are the main functions of a firewall? Mark all applicable answers. Keep authenticated Internet services through the TCP and UDP protocols Enable secure communications between two networks Keep insiders from exposing valuable data or services Enable accurate UDP communications Keep outsiders from breaking in What is a port? Information that is used to identify the sequence of packets Information that is used to distinguish among various Internet services Information that is used to distinguish among computers that connect to the Internet Information that is used to acknowledge the receipt of a packet Information that is used to identify TCP packets