Network scanning is one of the most important concepts in hacking. So in this article, we will talk about some basic and advance of the network scanning.
Network Scanning Concepts
As already discussed, footprinting is the first phase of hacking, in which the attacker gains primary information about a potential target. He/she then uses this information in the scanning phase-in order to gather more detailed information about the target.
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Basic Of Network Scanning
Scanning is the process of gathering additional information about the target by using reconnaissance techniques. Network Scanning is the process of identifying hosts, ports, and services in a network. In the network scanning process, the attacker mainly tries to identify the specific IP address, which is the open ports, the operating system of the target and system architecture, and which of the services running on each computer.
The purpose of the scanning is to discover exploitable communication channels, probe as many listeners as possible, and keep track of the ones that are responsive or useful to an attacker,s particular needs.
In the scanning phase of an attack, the attacker tries to find various ways to intrude into a target system. The attacker also tries to discover more about the target system to find out if there are any configuration lapses in it. The attacker then uses the information obtained during the scan to develop an attack strategy.
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Types of scanning
Lists the open ports and services. Port scanning is the process of checking the services running on the target computer by sending a sequence of messages in an attempt to break-in. Port scanning involves connecting to or probing TCP and UDP ports on the target system to determine if the services are running or are in a listening state. The listening state provides information about the operating system and the application is in current use. Sometimes, active services that are listening may allow an unauthorized user access to misconfiguration systems or to run the software with the vulnerabilities.
Lists IP addresses. Network scanning is a procedure for identifying active hosts on a network, either to attack them or to assess the security of the network.
Show the presence of known weaknesses. Vulnerability scanning is a method used to check whether a system is exploitable by identifying its vulnerabilities. A vulnerability scanner consists of a scanning engine and a catalog. The catalog includes a list of common files with know vulnerabilities and a catalog.
The catalog includes a list of common files with known vulnerabilities and common exploit list, transferring the request to the Web server, and analyzing the requests to ensure the safety of the server. These tools generally target vulnerabilities that secure host configurations can fix easily, updated security patches, and a dean Web document.
The access points that a thief who wants to break into a house looks for are the doors and windows. These are usually the house’s points of vulnerability, as they are easily accessible. When it comes to computer systems and networks, ports are the doors and windows of the system that an intruder uses to gain access.
A general rule for computer systems is that the more the number of open ports on a system, the more vulnerable Is the system. However, there are cases, In which a system has fewer open ports compared to another machine, but the open ports present a much higher level of vulnerability.
Objectives of Network Scanning
The more the information at hand about a target organization, the greater the chances of knowing a network’s security loopholes and consequently, for gaining unauthorized access to it.
Below are some objectives for scanning a network:
- Discover the network’s live hosts, IP addresses, and open ports of live. Using open ports, the attacker will determine the best means of entry Into the system.
- Discover the operating system and system architecture of the target. This is also known as fingerprinting. An attacker can formulate an attack strategy based on the operating system’s vulnerabilities.
- Discover the services running/listening on the target system. Doing so gives the attacker an Indication of vulnerabilities (based on the service) exploitation for gaining access to the target system.
- identify specific applications or versions of a particular service.
- Identify vulnerabilities in any of the network systems. This helps an attacker to compromise the target system or network through various exploits.
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