Book Image

Network Protocols for Security Professionals

By : Yoram Orzach, Deepanshu Khanna
5 (1)
Book Image

Network Protocols for Security Professionals

5 (1)
By: Yoram Orzach, Deepanshu Khanna

Overview of this book

With the increased demand for computer systems and the ever-evolving internet, network security now plays an even bigger role in securing IT infrastructures against attacks. Equipped with the knowledge of how to find vulnerabilities and infiltrate organizations through their networks, you’ll be able to think like a hacker and safeguard your organization’s network and networking devices. Network Protocols for Security Professionals will show you how. This comprehensive guide gradually increases in complexity, taking you from the basics to advanced concepts. Starting with the structure of data network protocols, devices, and breaches, you’ll become familiar with attacking tools and scripts that take advantage of these breaches. Once you’ve covered the basics, you’ll learn about attacks that target networks and network devices. Your learning journey will get more exciting as you perform eavesdropping, learn data analysis, and use behavior analysis for network forensics. As you progress, you’ll develop a thorough understanding of network protocols and how to use methods and tools you learned in the previous parts to attack and protect these protocols. By the end of this network security book, you’ll be well versed in network protocol security and security countermeasures to protect network protocols.
Table of Contents (23 chapters)
1
Part 1: Protecting the Network – Technologies, Protocols, Vulnerabilities, and Tools
7
Part 2: Network, Network Devices, and Traffic Analysis-Based Attacks
12
Part 3: Network Protocols – How to Attack and How to Protect

Layer 3 protocols – IP and ARP

The purpose of Layer 3 is to forward user information from end to end. This is usually from the user's PC, laptop, or smartphone to the organization's servers or to servers on the internet, but also in IoT devices and sensors, from cellphone to cellphone, and more.

In this section, we will examine the Internet Protocol version 4 (IPv4) and Address Resolution Protocol (ARP) that resolve the local destination MAC address from its IP address. We will discuss IPv4 next.

IPv4

As you can see in Figure 2.17, the layer-3 IP packet is carried inside the payload field of the layer-2 frame, usually Ethernet, and carries inside its payload the layer-4 protocol, which is usually UDP or TCP:

Important Note

An IP can be carried by layer-2 Ethernet or any other frame. Ethernet is the most common frame in layer 2, but an IP can be carried by cellular frames or any other layer 2.

Figure 2.17 – The IPv4 packet...