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

Encapsulation and tunneling

Encapsulation is a general mechanism in data communications in which one protocol datagram is carried by another. Although this is the standard way in which packets are carried, one over the other, for example, TP over IP, HTTP over TCP, and more, there are cases in which packets in one layer are carried over packets in the same layer or packets are encapsulated for encryption. Using encapsulation to hide the internal header inside an external header can also be used for bypassing network defenses, as we will see in Chapter 6, Finding Network-Based Attacks.

In Figure 2.30, we can view a simple example of encapsulation. Here, we have two LANs connected via a tunnel that is configured between R1 and R3. The PCs on the two sides have the addresses of 172.12.1.10/24 and 172.16.2.10/24. The tunnel interface on R1 is configured with the address of 20.1.1.1/24, and the end of the tunnel is configured on R3 with the address of 172.21.1.1/24:

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