the drivers for network devices do not interact directly with the protocol stack in the kernel, but rather use the kernel’s network device management module as an intermediate bridge.

The advantage of this is that the driver does not need to know the details of the network stac

A bridge is a virtual network device, so it has the characteristics of a virtual network device and can be configured with IP and MAC addresses.

Your program is just a series of machine instructions that need to be executed one after the other sequentially

t’s the job of the Thread to account for and sequentially execute the set of instructions it’s assigned.

I call a Thread, “a path of execution”

The protocol of a socket is set when a socket is created with the socket() function

The source address and port are set with the bind() function

The destination address and port are set with the connect() function.

Sentinel acts as a configuration provider or a source of authority for clients service discovery.

there is a leader follower (master-replica) replication that is simple to use and configure

It allows replica Redis instances to be exact copies of master instances. The replica will automatically reconnect to the master every time the link breaks, and will attempt to be an exact copy of it regardless of what happens to the master.

When a partial resynchronization is not possible, the replica will ask for a full resynchronization. This will involve a more complex process in which the master needs to create a snapshot of all its data, send it to the replica, and then continue sending the stream of commands as the dataset changes.