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Recent Posts

  • Comparing Command-Line Tools

    Comparing Command-Line Tools

    If you’re planning to take the SY0-501 exam, you should have a basic understanding of available software tools to assess the security posture of an organization. This includes using security tools such as protocol analyzers, command-line tools, logs, and audits. …
  • Common Password Attacks

    Common Password Attacks

    If you’re planning to take the Security+ exam, you should have a basic understanding of cryptographic attacks. This includes common password attacks that attempt to discover or bypass passwords used for authentication on systems and networks, and for different types …
  • Web Application Attacks

    Web Application Attacks

    If you’re planning to take the SY0-501 version of the Security+ exam, you should understand many of the common attacks included web application attacks on servers. For example, can you answer this  question? Q. Looking at logs for an online web …
  • Comparing IPSs and IDSs

    Comparing IPSs and IDSs

    If you’re planning to take the SY0-501 exam, you should have a basic understanding of some of the more advanced network security concepts. This includes intrusion detection systems (IDSs) and intrusion prevention systems (IPSs). For example, can you answer this …
  • Is Your Computer Spying On You?

    Is Your Computer Spying On You?

    Is your computer spying on you? If it has a webcam, you may be surprised at easy it is to remotely enable it and have it send pictures. Years ago, I saw a news segment where a reporter showed how …
  • Implementing Zones and Topologies

    Implementing Zones and Topologies

    If you’re planning to take the SY0-501 version of the Security+ exam, you should have a basic understanding of secure network architecture concepts. These include implementation of different zones and topologies. For example, can you answer this  question? Q. Your organization …
  • Identifying Authentication Factor

    Identifying Authentication Factor

    If you’re planning to take the SY0-501 exam, you should have a good understanding of identity and access management concepts. This includes authentication factors such as the something you are authentication factor that uses biometrics for authentication. For example, can …
  • Understanding Commands

    Understanding Commands

    If you’re planning to take the SY0-501 exam, you should have a good understanding of command-line tools.  These include some relevant commands that you can run on your primary computer or within a virtual machine. For example, can you answer …
  • Cryptography & Encryption 

    Cryptography & Encryption 

    Cryptography provides two primary security methods you can use with email: digital signatures and encryption. These are separate processes, but you can digitally sign and encrypt the same email. If you’re planning to take the SY0-501 exam, you should have a …
  • An Easy Way to Learn Linux

    An Easy Way to Learn Linux

    Do you want to learn Linux? It may be easier than you think. I’ve wanted to learn Linux and get the Linux+ certification for a while now, but I don’t have a Linux system. Knowing that I’m a kinesthetic learner, …
  • Identifying Authentication Services

    Identifying Authentication Services

    Authentication services commonly use protocols to ensure that unencrypted credentials are not sent across a network. This protects user credentials and provides additional security for identity and access services. If you’re planning to take the SY0-501 exam, you should have …
  • Attacks Launched Against Systems

    Attacks Launched Against Systems

    If you’re planning to take the SY0-501 exam, you should have a good understanding of common and advanced types of attacks launched against systems and networks. This includes identifying ARP poisoning and DNS attacks. For example, can you answer this …
  • 5 Things You Need to Know About Cybersecurity in 2019

    5 Things You Need to Know About Cybersecurity in 2019

    Cybersecurity used to be just a buzzword — but now it’s an absolute necessity. As we continue to integrate technology into our everyday lives, the threats only continue to grow larger, and our defensive technologies must evolve. However, this constant …
  • Comparing Well-known Attacks

    Comparing Well-known Attacks

    If you’re planning to take the SY0-501 exam, you should have a basic understanding of many of the well-known attacks. This includes advanced types of attacks launched against systems and networks. For example, can you answer this practice test question? …
  • Common Certificate Issues

    Common Certificate Issues

    A certificate provides the ability to establish a secure session but there are many different certificate issues that can result in an invalid certificate. If you’re planning to take the SY0-501 version of the Security+ exam, you should have a good …

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CompTIA Security+: Get Certified Get Ahead: SY0-501 Study Guide

 

Comparing Command-Line Tools

Posted by on December 6 in Security+ | 0 comments

If you’re planning to take the SY0-501 exam, you should have a basic understanding of available software tools to assess the security posture of an organization. This includes using security tools such as protocol analyzers, command-line tools, logs, and audits.

For example, can you answer this practice test question?

Q. You suspect that an attacker has been sending specially crafted TCP packets to a server trying to exploit a vulnerability. You decide to capture TCP packets being sent to this server for later analysis and you want to use a command-line tool to do so. Which of the following tools will BEST meet your need?

A. Wiredump

B. Tcpdump

C. Netcat

D. Nmap

More, do you know why the correct answer is correct and the incorrect answers are incorrect? The answer and explanation are available at the end of this post.

There are command-line tools available on Windows and Linux systems. Some tools are useful when performing vulnerability scans and penetration tests.

Tcpdump

Tcpdump is a command-line packet analyzer (or protocol analyzer). It allows you to capture packets like you can with Wireshark. The difference is that Wireshark is a Windows-based tool and tcpdump is executed from the command line. Many administrators use tcpdump to capture the packets and later use Wireshark to analyze the packet capture. One of the online labs for this chapter shows how to do this.

Kali Linux includes tcpdump, but you won’t find it on Windows systems. As with most Linux command-line tools, tcpdump is case sensitive. You need to enter tcpdump in all lowercase. Additionally, the switches must be entered with the proper case. For example, -c (lowercase c) represents count and indicates the capture should stop after receiving the specified number of packets. However, -C (uppercase C) represents file size and indicates the maximum size (in millions of bytes) of a packet capture. When the file reaches this size, tcpdump closes it and starts storing packets in a new file.

CompTIA Security+ Study Guide

The 501 Version of the Study Guide

The CompTIA Security+: Get Certified Get Ahead: SY0-501 Study Guide is an update to the top-selling SY0-201, SY0-301, and SY0-401 study guides, which have helped thousands of readers pass the exam the first time they took it.  It includes the same elements readers raved about in the previous three versions.

Each of the eleven chapters presents topics in an easy to understand manner and includes real-world examples of security principles in action.

You’ll understand the important and relevant security topics for the Security+ exam, without being overloaded with unnecessary details. Additionally, each chapter includes a comprehensive review section to help you focus on what’s important.



Over 300 realistic practice test questions with in-depth explanations will help you test your comprehension and readiness for the exam. The book includes:

  • A 75 question pre-test
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Each practice test question includes a detailed explanation to help you understand the content and the reasoning behind the question. You’ll be ready to take and pass the exam the first time you take it.

If you plan to pursue any of the advanced security certifications, this guide will also help you lay a solid foundation of security knowledge. Learn this material, and you’ll be a step ahead for other exams. This SY0-501 study guide is for any IT or security professional interested in advancing in their field, and a must-read for anyone striving to master the basics of IT security.

Kindle edition also available.

Nmap

Nmap is a network scanner. The graphical side of Nmap is Zenmap. It includes many capabilities, including identifying all the active hosts and their IP addresses in a network, the protocols and services running on each of these hosts, and the operating system of the host. When running the command, you include the scan type(s), optional options, and target specifications. As an example, consider the following command:

nmap -T4 -A -v 192.168.0.0/24

Notice that it has three switches, -T4, -A, and -v:

  • T4. T4 refers to the speed of the scan. Valid switches are T0 through T5 with T0 being the slowest and T5 being the fastest. Faster scans are likely to be detected, while slower scans may not be detected.
  • A. The -A switch indicates the scan should include OS detection, version detection, script scanning, and traceroute.
  • -v. The -v switch indicates the verbosity You can get more data output by using -vv or -vvv.

Comparing Command-Line Tools

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SY0-501 Full Security+ Course

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Online access includes all of the content from the

CompTIA Security+: Get Certified Get Ahead: SY0-501 Study Guide

  • Introduction
  • About the exam (including information on the number of questions, test duration, passing score, types of questions and more. Also includes a listing of the exam objectives)
  • 75 question pre-assessment exam
  • Mastering Security Basics (full content from Chapter 1 of the study guide including the exam topic review and 15 practice test questions)
  • Understanding Identity and Access Management (full content from Chapter 2 of the study guide including the exam topic review and 15 practice test questions)
  • Exploring Network Technologies and Tools (full content from Chapter 3 of the study guide including the exam topic review and 15 practice test questions)
  • Securing Your Network (full content from Chapter 4 of the study guide including the exam topic review and 15 practice test questions)
  • Securing Hosts and Data (full content from Chapter 5 of the study guide including the exam topic review and 15 practice test questions)
  • Comparing Threats, Vulnerabilities, and Common Attacks (full content from Chapter 6 of the study guide including the exam topic review and 15 practice test questions)
  • Protecting Against Advanced Attacks (full content from Chapter 7 of the study guide including the exam topic review and 15 practice test questions)
  • Using Risk Management Tools (full content from Chapter 8 of the study guide including the exam topic review and 15 practice test questions)
  • Implementing Controls to Protect Assets (full content from Chapter 9 of the study guide including the exam topic review and 15 practice test questions)
  • Understanding Cryptography and PKI (full content from Chapter 10 of the study guide including the exam topic review and 15 practice test questions)
  • Implementing Policies to Mitigate Risks (full content from Chapter 11 of the study guide including the exam topic review and 15 practice test questions)
  • 75 question post-assessment exam
  • Glossary

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Netcat

Chapter 3 of the CompTIA Security+: Get Certified Get Ahead: SY0-501 Study Guide discusses Netcat and how administrators often use it for remotely accessing Linux systems. It doesn’t include native encryption so it’s common to use SSH to secure the session. Additionally, Netcat can easily be used for banner grabbing. The following is a sample command used for banner grabbing:

echo “” | nc -vv -n -w1 72.52.206.134 80

It uses the netcat command (nc) along with some switches: -vv for a verbose output, -n to not resolve host names, -w1 to wait no more than 1 second for a reply. The command connects to port 80 of the system with an IP address of 72.52.206.134. The echo “” sends a blank command to the server and the pipe symbol ( | ) tells Netcat to send the command after establishing the connection.

Some other uses of Netcat include:

  • Transferring files. One of the online labs for the CompTIA Security+: Get Certified Get Ahead: SY0-501 Study Guide shows how to create a chat session between two systems. Once this session is open, you can use the connection to copy files between the systems.
  • Port scanner. You can use Netcat to run a port scan against a single IP address. It allows you to specify the range of ports, such as 10 through 1024 and randomize the ports scanned to evade detection. It also supports waiting longer periods of time between port checks, again, to evade detection.

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Over 300 realistic Security+ practice test questions

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Multiple quiz formats to let you use these questions based on the way you learn.
  • Learn mode - randomized. View each of the questions in random order. Learn mode allows you to keep selecting answers until you select the correct answer. Once you select the correct answer, you'll see the explanation. Click here to see how learn mode works.
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  • Test mode - 75 random questions. View 75 random questions from the full test bank similar to how the Security+ exam has a potential maximum of 75 multiple choice questions. In test mode, you can only see the correct answers and explanations after you complete the test. Click here to see how test mode works.

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Q. You suspect that an attacker has been sending specially crafted TCP packets to a server trying to exploit a vulnerability. You decide to capture TCP packets being sent to this server for later analysis and you want to use a command-line tool to do so. Which of the following tools will BEST meet your need?

A. Wiredump

B. Tcpdump

C. Netcat

D. Nmap

Answer is B. The tcpdump command-line tool is the best choice of the given It is a command- line packet analyzer (or protocol analyzer) and its primary purpose is to capture packets. Wiredump isn’t a valid tool name.

Wireshark (not included as an answer choice) is a graphic-based packet analyzer that can be started from the command line, but tcpdump includes more command-line options than Wireshark.

Netcat is useful for remotely accessing systems and can be used for banner grabbing, but it doesn’t capture packets.

Nmap analyzes packets during a scan. It can also use Npcap, the Nmap Project’s packet sniffing library, but Nmap isn’t the best choice to capture packets.

See Chapter 8 of the CompTIA Security+: Get Certified Get Ahead: SY0-501 Study Guide for more information on using security tools.

CompTIA Security+ Get Certified Get Ahead: SY0-501 Study Guide

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