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

IP telephony – protocols and operations

In this section, we talk about the IP telephony protocols, also known as the VoIP protocols, but before directly moving on to the protocols, let's first understand what VoIP is, how VoIP works, and its various derivatives.

VoIP

VoIP means telephonic communication that happens over an internet line and not the old PSTN-based telephone lines. The VoIP protocol is responsible for delivering voice communications and streaming live sessions over the internet. A very basic example is Skype, a Microsoft product that works over the VoIP protocol. VoIP has its advantages and disadvantages, but before moving on to that, let's understand VoIP in depth.

The following diagram depicts VoIP communication:

Figure 16.1 – VoIP communication

The complete VoIP communication works like this:

  1. Client 1 using some intermediate VoIP server (here PBX) sends an INVITE request to Client 2.
  2. Client 2 accepts...