by using the ping command we can know wether our network is dead or alive..........
Patch management is an area of systems management that involves acquiring, testing, and installing multiple patches (code changes) to an administered computer system. Patch management tasks include: maintaining current knowledge of available patches, deciding what patches are appropriate for particular systems, ensuring that patches are installed properly, testing systems after installation, and documenting all associated procedures, such as specific configurations required. A number of products are available to automate patch management tasks, including Ringmaster’s Automated Patch Management, Patch Link Update, and Gibraltar’s Ever guard
TCP - Transfer Control Protocol.
* a. Reliable
* b.Connection oriented.
UDP - User Datagram Protocol.
* a.Non Reliable
* c.No Acknowledgement
It is a set of rules defining a very simple virtual terminal interaction. The NVT is used in the start of a Telnet session.