Challenges in a wifi network :-
The convenience of the WLAN poses security risks that do not exist in the wired world. The first and the foremost thing is how can we protect something that we can't see or feel. You might be surrounded by a wireless network but you can't see or feel it using any of your human senses. Another issue with the wireless network is that it has no specific boundaries.
That mean if you have a wifi setup in your home, it doesn't restrict the wifi network to your home only, and it might be accessible outside the perimeters of your house. There is nothing much you can do to limit the vicinity of the wifi network. The user can access the wifi network from anywhere in the vicinity of the network. Now this possess a security threat as an attacker can be sitting anywhere in the vicinity of the wifi network or he may be sitting away and use an antenna to communicate with the various wireless devices in your network. This way it is hard to determine the location of an attacker. The sniffing attacks which is a kind of passive attack in which the attacker only collects(sniffs) the packets which are going in the air can be performed from miles away using a directional antenna.
Before we go further, following are some of the things you should be prepared with right now.
- Get familiar with the Backtrack OS and the tools available in it
- Get a basic knowledge of some common Linux system commands
- Get a basic idea about 802.11 standards and about the different organizations which set these standards and help in tailoring them.
Without wasting much of our time, lets have a look at some of the terminologies, which we will be using throughout this section.
All the components in a network that can connect to a wireless medium are known as stations. Wireless stations can be classified into 2 categories:
1) Access Points
Access points (AP) are the base stations through which various devices connect and become a part of the network. Wireless clients can be mobile devices such as laptops, personal digital assistants, or fixed devices such as desktops and workstations that are equipped with a wireless network interface.