Networking II Communication Protocols TCP/IP Communication software Regardless of the hardware used to connect networked computers, they also require communication software in order to communicate effectively
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Communication software can take a variety of forms
Computers whose exclusive (or main) networking needs are to speak with other computers on a LAN may use network operating system software (NOS) such as Novell’s Netware or Microsoft’s Windows Server or Apple’s AppleTalk
In the same way that an OS hides the inner workings of many of a computer’s doings, a NOS hides the inner workings of network communications
A NOS must be able to respond to requests from other computers on the LAN and must be configured to agree on the various protocols
A static IP address is permanently assigned to a computer
Most web servers have static IP addresses
If a computer has a dynamic IP address, it means that the IP address for that computer changes
This is almost always the case when you connect to the internet using WiFi. The ISP providing the internet connection assigns you a unique IP address for the duration of your connection. When you disconnect, the address is freed up for someone else to use.
The next time you connect, you get a brand new IP address, which, again, will last until you disconnect
This situation sometimes applies to broadband (always-on) connections as well