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Special application of VoIP
Lembard, Tomáš ; Šebesta, Jan (referee) ; Fuchs, Michal (advisor)
The aim of this master's thesis is suggestion and following realization of voice transmission over the local network equipment and a description of used circuits and solutions in terms of hardware and software. This thesis deals with digitization of low-frequency signals, the structure of IP and UDP protocols, implementation of TCP/IP stack cIPS
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Computer Network Design of Company
Flaxa, Michal ; Jordán, Vilém (referee) ; Ondrák, Viktor (advisor)
The bachelor thesis focuses on designing computer network in an old building containing Diton Ltd company offices. The design will consist of a complete documentation on the implementation of a new computer network including passive as well as active elements. This work should be used for the subsequent construction in the building.
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Network attacks by Cain & Abel
Smékal, Lukáš ; Stančík, Peter (referee) ; Sobotka, Jiří (advisor)
This Master’s thesis is dealt in the local area network security, cryptographic algorithms, particular attacks on computer networks a practical application these attacks in local area networks. To application particular attacks is used the Cain & Abel program. The detailed manual for this program is created from the results of these attacks. This manual contains the exhibits of usage particular program tools and the attack application exhibits. This manual considers consequences of particular attacks and summarises achieved results during work with tools too. Master thesis closely deals with one of the program tools called RSA SecureID Token Calculator. Authentication via hardware tokens is contained in this Master thesis. Thesis contains the way of authentication using RSA SecureID Token Calculator without physical owning of the hardware token. Cain & Abel program shows and interprets why cashed passwords in operation system are dangerous and it shows methods how attacker can reveal this passwords from the operation system memory. This Master thesis is focused on sniffing credentials and passwords in local area networks and it is focused on cryptographic algorithms cracking for username and passwords revealing.
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Detection and mitigation of cyber attacks at local area networks
Racka, Jan ; Lieskovan, Tomáš (referee) ; Gerlich, Tomáš (advisor)
The bachelor thesis is focused on the detection and mitigation of flood attacks in local area networks. The thesis can be divided into two parts. In the theoretical part, first flooding attacks are described. Then, the problem of attack detection is discussed in depth, including the implemented detection methods. Subsequently, the classification of detection tools by location is discussed and examples of detection tools are given. The last theoretical section is devoted to network mapping methods and topology detection tools. In the practical part, the design of the IDS and the test network is discussed. The network consists of three end devices namely: the IDS, the victim and the attacker. A Mikrotik router is used to ensure connectivity between all the devices. The IDS has been implemented in Python and is composed of individual modules that extend its functionality. The most important module is the detection module, which contains detection methods against SYN Flood, UDP Flood, ICMP Flood attacks and one universal comprehensive method against all flood attacks. The ARP Scan module allowed the IDS to map the network and use ARP queries to detect the presence of endpoint devices in the network. The learning module made it easier to set up rules for each detection method by monitoring network traffic over a period of time. It then determines appropriate rule values from the detected data. The SSH module provided IDS with the ability to proactively respond to attacks and disconnect the attacker from the rest of the network. ARP Scans also use the SSH module to discover information about guests. The IDS has been tested in both virtual and real environments. The results show that the developed detection methods work and the IDS can stop the attack in a reasonable time. ARP Scanning was also tested and was able to detect new guests on average in the first pass. The effect of IDS on communication was also monitored and found to be minimal.
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The remote control workplace of electrochemical sensors
Cieslar, Jakub ; Šteffan, Pavel (referee) ; Adámek, Martin (advisor)
This master’s thesis deals with the design of automated workplase for measurement with electrochemical sensors. Design and realization of a device, which communicates with computer and which can be controlled via WAN or LAN nets, are the main aims of this work. This thesis describes the process of designing, realization and optimalization of designed preparation adjustment. It also describes created software of a device, driver for service PC and programme of a web client.
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Computer Network Design for small business
Havelka, Ondřej ; Jordán, Vilém (referee) ; Ondrák, Viktor (advisor)
The aim of bachelor´s thesis is computer network design for small business. The bachelor´s thesis is divided into three parts. The first part is engaged theoretical ground of computer network, second part analyzes the current state of universal cabling within the specific business. The last part contains a design to modernize the existing universal cabling including summary of expected costs for realization of design.
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Company Computer Network Design
Novák, Petr ; Jordán, Vilém (referee) ; Ondrák, Viktor (advisor)
This bachelor thesis deals with computer network design in a company. The first chapter is about the theoretical concepts important for designing a computer network. The second chapter contains the analysis of a current status, which serves as a foundation for my own design solution, which is also the last chapter of this bachelor thesis. The last chapter also includes economic evaluation of the whole network design.
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