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Leslie, the network administrator of Livewire Technologies, has been recommending multilayer inspection firewalls to deploy the company's infrastructure. What layers of the TCP/IP model can it protect?
Multilayer inspection firewalls, also known as Next-Generation Firewalls (NGFWs), are designed to provide comprehensive security by inspecting traffic across multiple layers of the TCP/IP model. These firewalls offer protection at the:
Application Layer: They can analyze and filter traffic based on application-level protocols and payloads, such as HTTP, FTP, and DNS, providing protection against application-specific attacks.
Transport Layer (TCP): They inspect the transport layer to monitor and control TCP/UDP traffic, preventing threats such as port scans and DoS attacks.
Internet Layer (IP): They filter and monitor IP packets, enforcing security policies based on IP addresses and ensuring protection against IP-level attacks like IP spoofing.
By operating at these layers, multilayer inspection firewalls provide a robust defense mechanism against a wide range of network threats.
EC-Council Certified Network Defender (CND) Study Guide
Documentation on Next-Generation Firewalls and their functionalities
A network administrator is monitoring the network traffic with Wireshark. Which of the following filters will she use to view the packets moving without setting a flag to detect TCP Null Scan attempts?
In Wireshark, to detect TCP Null Scan attempts, the filter used istcp.flags==0. This filter will show packets where no TCP flags are set, which is indicative of a TCP Null Scan. A TCP Null Scan is a type of network reconnaissance technique where the attacker sends TCP packets with no flags set to the target system. If the target system responds with a RST packet, it indicates that the port is closed, while no response suggests that the port is open or filtered. This method is used because some systems do not log these null packets, allowing the scan to go unnoticed.
Which of the following things need to be identified during attack surface visualization?
During attack surface visualization, it is crucial to identify the assets, topologies, and policies of the organization. This involves mapping out all the devices, paths, networks, and understanding the security posture of each asset. By identifying these elements, organizations can determine where vulnerabilities may exist and how an attacker could potentially exploit them. This process helps in prioritizing security efforts and mitigating risks effectively.
Identify the type of event that is recorded when an application driver loads successfully in Windows.
Identify the attack signature analysis technique carried out when attack signatures are contained in packet headers.
Atomic signature-based analysis is a technique that examines individual packets for attack signatures contained in packet headers. This method focuses on specific, identifiable patterns or anomalies within single packets that may indicate malicious activity. Since the attack signatures are within the packet headers, the analysis does not need to consider the broader context of multiple packets or sessions, making it an atomic-level inspection.
EC-Council Certified Network Defender (CND) Study Guide