Chapter 2. Scanning Pentesting

Network scanning refers to a set of procedures that investigate a live host, the type of host, open ports, and the type of services running on the host. Network scanning is a part of intelligence gathering by virtue of which an attack can create a profile of the target organization.

In this chapter, we will cover the following topics:

  • How to check live systems
  • Ping sweep
  • TCP scanner
  • How to create an efficient IP scanner
  • Services running on the target machine
  • The Concept of a port scanner
  • How to create an efficient port scanner

You should have basic knowledge of the TCP/IP layer communication. Before proceeding further, the concept of the Protocol Data Unit (PDU) should be clear.

PDU is a unit of data specified in the protocol. ...

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