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A protocol that is used to create a basic layer of security for a wireless network is to set up a password and log in. This way no one else can use the wireless network, but the owner.
It is not required, no.
home network
How do multiple access points identify themselves as part of the same network
An ad-hoc network is a wireless network in which all connections are wireless. The only devices required are wireless network interface cards in all of the devices that want to participate in the network.
An wireless internet router. (For example Sky, BT, TalkTalk and many more)
Nope!
An ad-hoc network is completely wireless; there are no wired connections. Therefore, to create one, all devices must have a working wireless connection.
If you do not set password for your wireless network you will get unsecured network. If you mean that you want use your router to connect to another unsecured wireless network and create so called "bridge" the answer is yes. But! Router from different manufactures usually do not work together in the bridge configuration. There are some exceptions but just few.
If you have a network wireless camera as well as internet access you will be able to create a system to view the camera from any computer. This is very easy to set up.
Probably not. It actually depends on the configuration of your work network. In any case, making changes you don't fully understand puts your network, and possibly your job, at risk.
It's called MAC filter. It allows to create black or white list depending on what you need.