This firewall is situated at Layers 3 and 4 of the Open Systems Interconnection (OSI) model. It also includes packet length, layer 3 information related to reassembly and fragmentation, TCP sequence numbers of layer 4, flags, etc. It includes the IP addresses and the port number of the source and the destination. The context of a connection consists of the metadata related to the packets. Any future packets for this connection will be rejected. However, when a firewall sees an RST or FIN+ACK packet, it marks the connection state for deletion.
Then the connection receives the SYN+ACK by the server, at the point when the firewall has checked the packets from both sides and it promotes its internal connection state to ESTABLISHED. The TCP stack sets the SYN flag to indicate the start of a new connection. At first, a client initiates a connection using a three-way handshake. In TCP, four bits out of the nine assignable control bits are used to control the state of the connection. Let’s take TCP-based communication as an example. In simple words, state means the last known or current status of a process, and managing state refers to keeping track of the process. Difference between Synchronous and Asynchronous Transmission. nslookup command in Linux with Examples. 
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Transmission Modes in Computer Networks (Simplex, Half-Duplex and Full-Duplex). Types of area networks - LAN, MAN and WAN. Network Devices (Hub, Repeater, Bridge, Switch, Router, Gateways and Brouter). ISRO CS Syllabus for Scientist/Engineer Exam. ISRO CS Original Papers and Official Keys. 
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Full Stack Development with React & Node JS (Live).Data Structure & Algorithm Classes (Live).
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