Mastering TCP/IP Part 3: Additional Information – CompTIA Security+ Lesson 7

In this lesson we are gonna talk about IPv6, Encapsulation, Handshakes and well known Protocols and services used by TCP/IP.

IPv4 and IPv6

The things to know for the exam regarding this topic is that IPv6 supports 128-bit addresses and IPv4 supports “only” 32-bit addresses. And that IPv6 includes mandatory IPSec security.


Encapsulation allows a transport protocol to be sent across the network by adding header information. This video explains it fast and easy:

Working with Protocols and Services

In order to pass the exam you’ll need a basic understanding of protocols and services, but I wont go deeper into this subject right now. The book mentioned at the bottom of the post has a little explanation in it. But you can easily gain some basic knowledge about this topic with a little google search or the links I’ll provide.

Just remember, you don’t need to be an expert on this subject. But basic knowledge is required to pass.

TCP Three-Way Handshake

In the last lesson we talked about the differences between TCP and UDP. TCP is connection oriented and in order to establish the connection it needs a three-way handshake.

Basically it’s the client knockin on the hosts door asking him if he can come in (by sending ISN (initial sequence number) and a message). The Host responds with yes or no (his ISN and a value indicationg its buffer). The client than says thank you (sends an aknowledgement back to the host).

Or more techy:

A host and a client can have an established connection on any port simultaniously.