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HOW TO USE NESSUS SCANNER ACROSS A DOMAIN HOW TO
HOW TO USE NESSUS SCANNER ACROSS A DOMAIN FULL
HOW TO USE NESSUS SCANNER ACROSS A DOMAIN SOFTWARE

This is a quick technique that hackers use to find weaknesses. Therefore, the interaction is not logged, but the sender learns if the port is open. In the event of a response, the scanner does not respond back, which means the TCP connection was not completed.

SYN scan: Also called a half-open scan, this sends a SYN flag to the target and waits for a SYN-ACK response.

HOW TO USE NESSUS SCANNER ACROSS A DOMAIN FULL

This scan is accurate but easily detectable because a full connection is always logged by firewalls. When it receives a SYN-ACK response, or an acknowledgment of connection, it responds with an ACK flag. It sends a synchronize (SYN) flag, or a connect request.

Vanilla scan: Another basic port scanning technique, a vanilla scan attempts to connect to all of the 65,536 ports at the same time.

A ping scan can be used by an administrator to troubleshoot issues, and pings can be blocked and disabled by a firewall. Ping scans send a group of several ICMP requests to various servers in an attempt to get a response. They are also known as internet control message protocol (ICMP) requests.

Ping scans: A ping scan is considered the simplest port scanning technique.

The ports numbered from 49,152 to 65,536 are considered dynamic and private ports, which can be used by almost everyone on the internet.Ī port scan sees packets sent to destination port numbers using various techniques.

HOW TO USE NESSUS SCANNER ACROSS A DOMAIN SOFTWARE

Ports numbered from 1,024 to 49,151 are considered “registered ports,” and they are registered by software companies.

Port 80 (TCP): The World Wide Web Hypertext Transfer Protocol (HTTP).

Port 53 (UDP): The Domain Name System (DNS), which translates internet domain names into machine-readable IP addresses.

Port 23 (TCP): The Telnet protocol used for unencrypted communication.

Port 22 (TCP): Secure Shell (SSH) protocol used for FTP, port forwarding, and secure logins.

Port 20 (UDP): File Transfer Protocol (FTP) used for transferring data.

Some of the most popular and most frequently used ports include:

HOW TO USE NESSUS SCANNER ACROSS A DOMAIN HOW TO

Ports are generally managed by the Transmission Control Protocol (TCP), which defines how to establish and maintain a network conversation between applications, and User Datagram Protocol (UDP), which is primarily used for establishing low-latency and loss-tolerating connections between applications. These ports, which are assigned by the Internet Assigned Numbers Authority (IANA), are held by leading businesses and Structured Query Language (SQL) services. Ports numbered 0 to 1,023 are called “well-known" ports, which are typically reserved for internet usage but can also have specialized purposes. Port numbers range from 0 through to 65,536 and are ranked in terms of popularity. This, in conjunction with an IP address, forms vital information that each internet service provider (ISP) uses to fulfill requests. To ensure consistency and simplify programming processes, ports are assigned port numbers. A port is a point on a computer where information exchange between multiple programs and the internet to devices or other computers takes place.