The knowledge of these port numbers might come handy or at least is good knowledge: Unix well known ports .
Another very good article on port scan: Port Scan and frequently used ports.
“An ephemeral (short-lived) port is a transport protocol port for Internet Protocol (IP) communications allocated automatically from a predefined range by the TCP/IP stack software.” - Wiki - these are non-privileged ports are assigned to a process dynamically. The key is that it is a range of ports and the range is different from OS to OS.
Before we leave this topic, let's share this article on arp and mac address - article on arp and mac address.
Unless you have been writing IPC code that uses system calls to the kernal, you perhaps have not come across signals. However, a knowledge of the signal may help you deepen your understanding. For example, when you issue a kill -9 command, you are asking the kernal to send a SIGKILL to the process that you want to termniate. Here is the the list of sginals from Wiki. Wiki on Signals
Another very good article on port scan: Port Scan and frequently used ports.
“An ephemeral (short-lived) port is a transport protocol port for Internet Protocol (IP) communications allocated automatically from a predefined range by the TCP/IP stack software.” - Wiki - these are non-privileged ports are assigned to a process dynamically. The key is that it is a range of ports and the range is different from OS to OS.
Before we leave this topic, let's share this article on arp and mac address - article on arp and mac address.
Unless you have been writing IPC code that uses system calls to the kernal, you perhaps have not come across signals. However, a knowledge of the signal may help you deepen your understanding. For example, when you issue a kill -9 command, you are asking the kernal to send a SIGKILL to the process that you want to termniate. Here is the the list of sginals from Wiki. Wiki on Signals
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