how many total ip hosts did zenmap find on the network? course hero

How many packets does Nmap send?

Nmap sends a couple of resets first to the open port, then sends six packets with just SYN set (the normal method for opening a TCP connection), followed each time with a reset (a TCP header with reset and ACK flags set, which aborts the connection). The sequence numbers in packets sent increase incrementally by one each time; this is abnormal behavior but is characteristic of sequence number collectors. Nmap collects the initial sequence numbers received from the target and looks for a pattern in the way they are incremented. This is called a TCP sequence prediction.

What is an intense scan?

Intense Scan is to comprehensive scan the network and all the computers in the network. The benefit is that you can check all the vulnerabilities in the network where you are connected with.

How do hackers attack?

Hackers traditionally follow a 5-step approach to seek out and destroy targeted hosts. The first step in performing an attack is to plan the attack by identifying your target and learning as much as possible about the target. Hackers traditionally perform an initial reconnaissance & probing scan to identify IP hosts, open ports, and services enabled on servers and workstations. In this lab, students will plan an attack on 172.30.0.0/24 where the VM server farm resides. Using ZenMap GUI, students will then perform a “Ping Scan” or “Quick Scan” on the targeted IP subnetwork.

What port is used to check if SMTP is available?

port 25 – to see if smtp is available.

Does Nmap trace every host?

Nmap does not perform a full trace to every host, so necessarily it must make assumptions about the hops that it has not probed. The first and most fundamental of these is that, in tracing a host, we find an intermediate hop that has already been seen in tracing another host, we may assume that it and all it parents’ hops are shared between the two hosts.