No, it is not. If anything, it provides another point at which your data can be intercepted. WiFi passwords are not all that hard to hack. There are even illegal Wi-Fi devices that have a rather strong signal and have built-in brute force attack features. If you are not using the WiFi features of a modem or router, the best thing to do is disable that functionality.
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Yes, it is a standard 3.5mm input, and you can use the cable you like, way more comfortable than cabled version. I generally used a wireless BT adopter with it to make it a wireless headset.
Wireless tends to be slower than a wired network in most cases, wireless networks are also more inconvenient for desktops if you don't have a built in wireless adapter.
A wireless card for laptops is used to enable the laptop to connect to a wireless network. A wireless router is used to keep track of the whereabouts of devices connected to the network. It is part of the network. This is a very basic answer but I think it should be enough to answer your question.
It is safer using PSN than most sites that we do use.
Wireless internet providers work just as well as network connections. The only difference is that network connections are more controlled, since they are connected to an official server.
Some PS3 have wireless network adapter installed and only what you need is to connect to your existing wireless network. Instructions are here http://www.ehow.com/how_4812599_up-ps-via-wireless-router.html If you do not have a wireless adapter, than you are stuck. So far there are no adapters which would work with PS3.
The host will not be allowed access to the wireless network.
Wireless networking costs can vary depending on the kind of wireless network that one is looking to buy. There are four kinds: wireless-a, wireless-b, wireless-g, and wireless-n. With networking, the prices vary because of the range and the quality of the network. Wireless-a networks are generally the weakest, therefore the cheapest, and can cost up to $60. Wireless-b networks are stronger than wireless-a, while wireless-g networks are stronger than wireless-b. Wireless-n networks are the strongest, and the newest, and they commonly cost up to $160.
Those are 2 different things. There are cable modems and DSL modems. Wireless refers to a type of network which can be based either on a Cable modem or a DSL modem. You can have a wired network, or a wireless network. Wireless networks have typically have had slower transfer rates than wired networks, but the technology is changing so wireless routers are becoming faster in transferring data.
Network Cables are more reliable as a wireless connection could be lost or there might be an interference due to neighbouring networks.
Just connect your network switch in one of four wireless lan ports. But if you are ready to spend more money you can buy wireless cards for all your PCs in that way you are not trapped with cables.
A Bridge assist in handing network traffic and can direct known traffic to its destination.