Linux – System and Network Security (LNX5)

Cybersecurity, ICT Security

This course covers best practices for securing Linux servers and networks. You will learn system hardening, effective access control and how to build secure VPN solutions. Emphasis is practical configuration and testing.

The course also covers SSH best practices, application-level SSL configuration and secure file handling, plus disk encryption options like dm-crypt and encfs. You will practice firewall design and tools to protect services and data in Linux.

THIS TRAINING COURSE WILL HELP YOU:

  • Harden Linux systems and manage permissions
  • Use SSH securely and configure key-based access
  • Deploy and configure VPNs (OpenVPN, IPSec)
  • Implement file and disk encryption and SSL

WHO SHOULD ATTEND?

  • Linux system administrators
  • Network engineers managing VPNs and firewalls
  • Security engineers implementing Linux protections

COURSE LOCATION AND AVAILABLE DATES



Need this course in English?

Public courses are usually delivered in Czech, but this course is also available in English. We can arrange private training for your team online, at your premises or in our classrooms, and tailor the content to your needs.

For groups of around 4 or more participants, private training can already be comparable in price to booking individual places on a public course. Send us your requirements and we’ll recommend the best format and provide an exact quote.

Request training in English

Course content:

Hide details
  • Security concepts on Linux
  • Access permissions under the classic UNIX model
    1. Principles
    2. Limitations
  • Configuring ACL permissions
    1. Supported file systems
    2. Relation to the classic UNIX permission model
  • Effective use of SSH
    1. Configuring network access with keys
    2. Recommended hardening practices
    3. Using SSH for remote file transfer
  • Securing network services
    1. Application-level security options (SSL)
    2. Network-level security options and benefits
  • Securing network-layer transport
    1. VPN concepts
  • OpenVPN
    1. Advantages and disadvantages
    2. Server (endpoint) configuration
    3. Client setup
  • IPsec
    1. Advantages and disadvantages
    2. Using IPsec in tunnel and transport modes
    3. IPsec support on Linux: configuration options and implementations
    4. PSK and certificate concepts
    5. Configuring an IPsec tunnel between two endpoints
  • Effective firewall creation
    1. Overview
    2. Blocking clients
    3. Connection limiting
  • File encryption
    1. Using PGP/GPG to encrypt files
  • Disk encryption support
    1. Pros and cons of software and hardware encryption
    2. dm-crypt concept
    3. EncFS concept, advantages and disadvantages
    4. Creating an encrypted disk
  • SSL configuration in the Apache web server
    1. Creating certificates
    2. Installing certificates
    3. Verifying operation
Prerequisites:
Basic Linux system administration knowledge.
Recommended previous course:
Linux – Basic Administration (LNX1)
Schedule:
3 days (9:00-17:00)

Training and learning environment

IT classroom with desks, computer monitors, and a projection screen at the front.
What does the environment for in-person IT courses look like?We hold training courses in our own classrooms equipped with modern computer equipment for each participant and a large projection screen. Each workstation is fitted with a powerful computer for seamless practical exercises, and the environment supports a calm, friendly atmosphere during training.
IT classroom with desks, computer monitors, and a projection screen at the front.
Do I need to bring my own laptop to the classroom IT course?Our training rooms are fully equipped, so you do not need to bring your own laptop. A modern computer with all necessary hardware and software is ready for you at your workstation.
Sample ICT Pro certificate of successful completion of an IT training course.
Will you receive an official certificate after completing an IT course?Yes, upon successful completion of the training course, you will receive an official ICT Pro certificate confirming your participation and acquired technical skills. You can use it to verify your qualifications or add it to your professional profile.
Exterior view of the COMGUARD office building on Sochorova Street in Brno.
Where can you find our training center in Brno?The premises of the ICT Pro training center are located on the 1st floor of the COMGUARD building at Sochorova 38 in Brno. Positioned on the border of Žabovřesky and Komín, the location is easily accessible by both car and public transport.
Exterior view of the Opatov Park office building in Prague, Chodov.
Where can you find our training center in Prague?The premises of the ICT Pro training center are located on the 1st floor of the Opatov Park building at Líbalova 1, Prague 11 – Chodov. The location provides a comfortable environment for your education with convenient access.
Fully equipped kitchenette with a coffee machine, microwave, sink, and shelves with cups and glasses.
What facilities and refreshments are available to you during training breaks?Our training centers feature a fully equipped kitchenette for a comfortable break during your courses. The facilities include a coffee machine, microwave, kettle, and a wide selection of drinks and snacks.
Coffee station featuring an automatic coffee machine, yellow and white cups, glasses, and syrups.
What beverage refreshments are available during your course?A beverage station with a coffee machine, teas, syrups, and water is at your disposal throughout the entire training session. You can enjoy a coffee or another drink of your choice anytime during breaks.
Table with sweet pastries, fruit syrups, a water dispenser, and glasses set up for training participants.
What light refreshments are provided for you during the courses?During course breaks, participants can enjoy light sweet snacks, pastries, and fruit syrups to mix their own drinks. Fresh water dispenser and plates are also available for your convenience.
Wicker baskets filled with packaged savory snacks, sweet biscuits, and snack bars.
Should I bring my own snacks to ICT Pro training?There is no need to. A wide selection of savory snacks, sweet biscuits, and snack bars is available for you during breaks. Boost your energy for all-day focus right inside the training center premises.
Outdoor wooden terrace with green surroundings by the glass building of the training center.
Can you spend training breaks in the fresh air?Yes, an outdoor terrace is available at our training center. During breaks between learning sessions, you can relax in the fresh air in a pleasant green environment.
Spacious outdoor wooden terrace with seating and views of the surrounding area.
Where can you relax during course breaks?Our training center features a spacious outdoor terrace with seating options. During breaks between learning sessions, you can step outside to relax and recharge in the fresh air.