A. Agent-based scanner Module 05/P561 CEH bookV12 *Network-Based Scanner: Network-based scanners are those that interact only with the real machine where they reside and give the report to the same machine after scanning. *Agent-Based Scanner: Agent-based scanners reside on a single machine but can scan several machines on the same network. *Proxy Scanner: Proxy scanners are the network-based scanners that can scan networks from any machine on the network. * Cluster scanner: Cluster scanners are similar to proxy scanners, but they can simultaneously perform two or more scans on different machines in the network.

B. Network-based scanner Explanation: In the given scenario, John employs a network-based scanner to identify vulnerabilities on the machines in the same network. A network-based scanner is a type of vulnerability assessment tool that scans the network for vulnerabilities and identifies security holes in the network devices and systems. It is a non-intrusive scanner that can detect vulnerabilities without accessing the system. It sends packets to the network and analyzes the response to identify vulnerabilities.

Though the scanner software was installed on a victims machine... Actually a network based scanner is being performed to identify vulnerabilities on the network and on the other machines. Agent based scanner would be installed a on machine BUT will send information about THAT machine to a central repo. This is not happening in this scenario.

My answer is network-base scanner. Reason 1: although an "agent" is installed on a victim machine, there is no mention of using this scanner to scan for vulnerability on this victim machine. Reason 2: The "agent" was used to scan on machines within the network, this fits the signature of a "network-based scanner"

A. Agent based. "installed a scanner on a machine" keyword is on a machine.

GPT4: B. Network-based scanner In the scenario described, the professional hacker is using a network-based scanner. This type of scanner is deployed on a network and scans multiple machines on that network to identify potential vulnerabilities without being installed on each individual machine. Network-based scanners are commonly used to assess security posture and identify vulnerabilities that could be exploited.

In the scenario described, where the hacker installed a scanner on a machine within the victim's network and scanned several machines on the same network, it aligns more closely with an Agent-Based Scanner. Agent-based scanners reside on a single machine but can scan several machines on the same network.

In the scenario described, where the hacker installed a scanner on a machine within the victim's network and scanned several machines on the same network, it aligns more closely with an Agent-Based Scanner. Agent-based scanners reside on a single machine but can scan several machines on the same network.

None-of-the-above would have been my answer. John didn't employ anything (himself).

A. Agent-based scanner

page 561 from CEH v12 book: Agent-Based Scanner: Agent-based scanners reside on a single machine but can scan several machines on the same network. A. Agent-Based Scanner

ChatGPT, Bard, Perplexity all using the Tree of Thought answering said B. A.I. = from Gods mouth to my ears. (Robot ears)

B. Network-based scanner Agent-based scanners can reside on a single machine and scan several machines on the same network. Agent-based scanners typically involve installing a scanning agent or software component on each target machine that you want to scan. These agents communicate with a central management system or console, which controls and coordinates the scanning process. The central console can initiate scans on multiple machines across the network, making it possible to scan multiple systems from a single machine where the console is installed. This approach provides more control and flexibility, as you can customize scanning options for each target machine and collect detailed information. However, it requires installing agents on each target system, which can be resource-intensive and may not be suitable for all scenarios.

The main difference between agent-based scanners and network-based scanners is that agent-based scanners require a software agent to be installed on each machine that is being scanned, while network-based scanners do not. Here the tool is installed only on one device. So it is network-based.

Answer: B. Network-based scanner Network-based scanners are used to scan networks for vulnerabilities. They work by sending probes to all of the devices on a network to identify open ports and services, as well as any known vulnerabilities associated with those ports and services. In the scenario described, the professional hacker installed a scanner on a machine belonging to one of the victims and scanned several machines on the same network. This is consistent with the use of a network-based scanner. Agent-based scanners work by installing a software agent on each device that needs to be scanned. The agent then communicates with a central server to report on the vulnerabilities that it finds.

Agent based scanner