What does TCB mean in NETWORKING

A Transmission Control Protocol (TCP) Control Block (TCB) is a data structure consisting of various pieces of information essential for the successful operation of the protocol. The TCB contains all the necessary information regarding a particular connection and helps keep track of the state of that connection. It’s responsible for managing how two computers interact, such as managing acknowledgements, sequence numbers, window size and other settings related to that connection.

When two machines communicate via TCP, each one uses its own TCB. This data structure keeps tracks of relevant parameters within the communication session between these two machines. For example, it will remember the current sequence number, which is used to ensure packets arrive in the right order and with no duplicates. It also contains information about what bytes have already been acknowledged by both machines as having been received successfully.

A TCB is typically stored in memory on either computer participating in a transmission session using TCP. In some systems, it may also be saved to disk when the current communication session ends so that it can be picked up again later if needed.

Each time an acknowledgement is sent or received during the course of a TCP communication session, changes are made to the associated TCBs by both parties. These updates are made to ensure packet delivery reliability and accuracy for each side involved in the transmission.

Depending on your specific network environment or desired performance goals for your application, you may need to make adjustments or modifications to your TCP control block settings. This could include changing parameters such as congestion window size or retransmission timeout intervals as well as enabling certain features like selective acknowledgements (SACKs).

The contents of a Transmission Control Protocol (TCP) control block can vary depending on its purpose but typically includes fields such as IP source address and port numbers, destination address and port numbers, sequence number values, packet arrival time stamps and window sizes. Additional data such as acknowledgements flags may also be present depending on what kind of exchange is happening between peers over this protocol — for instance whether using source quench messages or allowing fast retransmits due to timeouts/duplicate acks etc.

This depends on your system environment but if you're using Linux-based operating systems then most likely those details will be visible through tools like netstat or lsof commands which show active connections/sockets open at any given point in time and associated parameters values etc.

Yes you can; however you should be aware that creating new entries from scratch implies manually doing all those steps required for setting up connections correctly including initial handshake establishment followed by all other necessary tasks until successful communication occurs between peers reliably without any issues along way.

If not done properly then yes modifying TCP control blocks could leave your system more vulnerable to attack by malicious actors who might exploit weaknesses present in these configurations if they become aware of them.