Networking Basics

 

Basic of Network

A network is a group of two or more devices that are connected to each other to share the data or share the resource. A network contains a number of different computer system that is connected by a physical or wireless connection like server or router. This router has direct access to the internet. The device can only connect to the internet through the router or access point.

For example: Suppose the client or device connected to the network through Wi-Fi or Ethernet. If the client opens the browser and types google.com, then your computer will send a request to the router for asking google.com. The router will go to the internet and request google.com. The router will receive google.com and forward that response to the computer. Now the client can see google.com on the browser as a result.

In networking, devices on the same network communicate with each other using packets. If you send a video, login a website, sending chat messages, sending email, all the data is send as packets. In networking, devices ensure that these packets go in the right direction using the mac address. Each packet has the source mac and destination mac, and it flows from the source mac to destination mac.

Pre-connection Attack

Pre-connection attack is the first part of the network penetration testing. To perform this attack, we will look at the fundamentals like how to show all the networks around us, how to find the details of all the connected devices to a particular network. Once we know about the network and connected devices to it, we can disconnect any device without knowing the password of that device.

Following are the basic steps we will be going through to perform Pre-connection attack:

1. Wireless Interface in Monitor mode: In this step, we will change the mode of wireless device as Monitor mode.
2. About airodump-ng: In this step, we will use airodump-ng to list all the network around us and display useful information about them.
3. Run airodump-ng: In this step, we will see all the devices that are connected to a particular network and collect more information about it.
4. Deauthenticate the Wireless client: In this step, we can disconnect any device which is shown in the previous step using the aireplay-ng.