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You're reading from  CompTIA Security+: SY0-601 Certification Guide - Second Edition

Product typeBook
Published inDec 2020
PublisherPackt
ISBN-139781800564244
Edition2nd Edition
Tools
Kali Linux
Concepts
Cybersecurity
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Ian Neil
Ian Neil
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Ian Neil

Ian Neil is one of the world's top trainers of Security+. He is able to break down information into manageable chunks so that people with no background knowledge can gain the skills required to become certified. He has recently worked for the US Army in Europe and designed a Security+ course that catered to people from all backgrounds (not just IT professionals), with an extremely successful pass rate. He is an MCT, MCSE, A+, Network+, Security+, CASP, and RESILIA practitioner that has worked with high-end training providers over the past 23 years and was one of the first technical trainers to train Microsoft internal staff when they opened their Bucharest Office in 2006.
Read more about Ian Neil

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Introduction to Protocols

Protocol refers to the rules required by different applications for the exchange of data, where the application can perform actions such as running commands on remote systems, sending and receiving emails, and downloading files from the internet. Each application has a special port number that it uses for communication. You can think of ports as being TV channels: if we want to watch sport, we go to the sports channels; if we want to watch the news, we go to the news channel. Applications are the same (if we want to send an email, we use an email application), and they all have a distinct port number for each communication mode.

There are two types of ports: Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). The main difference between the two is that TCP is connection-oriented as it uses a three-way handshake, and UDP is faster but less reliable as it is connectionless. The following diagram shows the three-way handshake:

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CompTIA Security+: SY0-601 Certification Guide - Second Edition
Published in: Dec 2020Publisher: PacktISBN-13: 9781800564244
© 2020 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Ian Neil

Ian Neil is one of the world's top trainers of Security+. He is able to break down information into manageable chunks so that people with no background knowledge can gain the skills required to become certified. He has recently worked for the US Army in Europe and designed a Security+ course that catered to people from all backgrounds (not just IT professionals), with an extremely successful pass rate. He is an MCT, MCSE, A+, Network+, Security+, CASP, and RESILIA practitioner that has worked with high-end training providers over the past 23 years and was one of the first technical trainers to train Microsoft internal staff when they opened their Bucharest Office in 2006.
Read more about Ian Neil

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