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Configuration of networking devices in Packet Tracer
Wolf, Jakub ; Jeřábek, Jan (referee) ; Komosný, Dan (advisor)
This bachelor work is concerned with a Cisco academy problem and a Packet tracer from the Cisco company. The theoretical part is orienting it's attention on approach of the Cisco Academy schoolrooms. Follows the chapter, which specifies the operating system of the Cisco equipments and chapter describing the routing protocol Open Short Path First (OSPF), which is used in a practical part of this work. It is making clear the basic characters more closely and protocol functioning in autonomous systems of computer networks. The practical part consists of two projects which are created in Packet tracer. The first one is simulating the computer schoolroom of the Cisco academy with all the equipments. The second project is introducing the homework for students which is oriented on the routing protocol OSPF. There are documented the realized progresses in fine. The part of it are web presentations which are describing both projects.
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System for Remote Monitoring of Beer Brewing Process
Klíma, Oldřich ; Komosný, Dan (referee) ; Hošek, Jiří (advisor)
Bachelor's thesis is focused on problematics of remote monitoring and process control system for homebrewing, that are based on open source software. In the first chapter there is an introduction into beer brewing processes and the differences between industrial, small and home brewery is described. In the next chapter there are some informations about Internet of Things and suitable embedded platform is choosen. One of the compared software solution will be instaleand on this platform. The procedure of implementation is described in the next parts and thesis is then focusing on changes in the program of backend server application. These changes are imrpoving stability of whole system and they are adding support for wireless communication with controlled switches and sensors. The last part of this thesis introduces reader into set up and controll process of the software sollution.
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Automatic configuration of networking devices in Cisco academy laboratory
Verner, Lukáš ; Pust, Radim (referee) ; Komosný, Dan (advisor)
This bachelor´s thesis deals with proposal and system implementation for automatic configuration of Cisco network devices. This system is called AutoConf and it is intended for distant copying configuration files from eagle-server to the switches and routers in Cisco academy laboratory. It is handled by web pages placed on eagle-server. In this system, user can create new laboratory exercises with configuration files for network devices and then these files could be used for configurations. Informations about done configurations are saved in relation database MySQL. Network devices which will be configured by system AutoConf have to be connected with eagle-server. To setup their connection settings was created decision-making mechanism. If it detects physical connection between network device and eagle-server before network device starts, it will set network device for communication with eagle-server.
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Localization of nodes in Internet using King system
Exler, Michal ; Müller, Jakub (referee) ; Komosný, Dan (advisor)
This thesis is focus on problematics of nodes localization in Internet. There are describe methods for prediction latency by using artificial coordinates systems and by using direct measurement. This thesis is primarily focus on method names King, which is estimates latency between arbitrary end hosts by using recursive DNS queries in system for translate domain name.
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Active IP Geolocation for Verification Host Position in Internet
Balej, Jiří ; Róka, Rastislav (referee) ; Zdrálek, Jaroslav (referee) ; Komosný, Dan (advisor)
Dissertation thesis deals with methods for finding the location of the device in the Internet, based on knowledge of the IP address. The process is called IP geolocation and is currently solved by geolocation databases or by measurement of network properties to the IP address. The disadvantage of nowadays geolocation databases is an incorrect information about some locations, because they can be in large distance from correct position. The aim of the thesis is to develop a method for verification of a position from geolocation database using delay measurement. Because of it, there is a detail analysis of influence of partial delays on the distance estimation accuracy, calculated using measured delay between the landmark and the target IP address. For the same reason, long-term delay measurement was performed, where the IP geolocation accuracy was compared using calibration data from previous measurements. On this background, Cable Length Based Geolocalisation (CLBG) method is proposed. Principle of this method is built on the properties of partial delays, which depend on the length of transport media. Firstly, the method measures round trip time (rtt), which is subsequently lowered by intermediate devices and end stations delay. The geographical distance is estimated using signal speed in the transport media. Further, the winding media parameter is established, which is used to determine a constraint around the landmark. The intersection of all constraints defines the area, where the target IP is. The IP geolocation using CLBG gives better results than simpler methods (ShortestPing, GeoPing and SOI), in comparison with more advanced methods (CBG and Octant) the accuracy is similar. The disadvantage of the CLBG method is the size of region, where the target lies, but this is due to its purpose. The position found in geolocation database can be checked by evaluation if it lies in the region.
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Location of attacker attempting unauthorized access to operating system
Pokorný, Josef ; Burda, Karel (referee) ; Komosný, Dan (advisor)
My master thesis estimates physical location of potential operating system attacker. It deals with basic methods of attack against operating system: spam and viruses, searching the Internet, port scanning and operating system detection. The thesis disserts about a port scanner Nmap, a port scanning detector Scanlogd and about a system log watch Swatch. The thesis deals with geolocation methods of potential operating system attacker. These geolocation methods are divided into an active and a passive types. The active methods measure delay in the Internet. The passive methods query the database. I mentioned a freely accessible Whois database and MaxMind databases. There is a program developed and practically tested. The program simulates an attacker beginning an attack by scanning ports of target machine. The program works with dataset of real IP addresses. The program also detects the attack against operating system. The real and evaluated location of an attacker is got and then shown in a map. At the end there is a review of results and data comparison with colleagues.
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Virtual servers with Fedora operating system
Gajdušek, Ondřej ; Jeřábek, Jan (referee) ; Komosný, Dan (advisor)
This thesis deals with the PlanetLab Server Manager application whose aim is to simplify application development within the experimental distributed network PlanetLab. Thesis presents the PlanetLab network and describes its infrastructure. Application PlanetLab Server Manager, shortly abbreviated as plbmng, is described, its current state is evaluated and the existing functionality is presented to the reader. Further work focuses mainly on the implementation of the new functionality that is a software distribution and job scheduling to run the software at the specified time. The last part of the work presents an experiment that demonstrates a real-life usage of the newly added functionality. Work results are published at the public repository on the GitLab platform. The application was published at the package index for Python Packages - PyPI.
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Monitoring Application for Multicast sessions
Kopecký, Martin ; Komosný, Dan (referee) ; Šimek, Milan (advisor)
This work deals with a monitoring application for multicast sessions. The general aim is to develop the application for monitoring multicast sessions from network elements of a laboratory computer network. The first part describes possibilities of monitoring computer networks in terms of monitoring techniques and protocols. The second part contains a topology of the laboratory computer network and several basic commands for setting of the multicast in Cisco IOS. The third part is devoted to the developed application for monitoring the multicast in Java language. The last part describes the testing on an actual multicast network and an example of such testing is stated there.
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Remote connection to virtualized operating system
Veselý, Marek ; Červenka, Vladimír (referee) ; Komosný, Dan (advisor)
The thesis is focused on the new IT trend – virtualization. Below are described the types of virtualization, as well as different implementations of it. In the following chapters there will be described the TCP and ICMP protocols, as well as the SSH services. The last part of this work is dedicated to measurements where there will be highlighted the advantages and disadvantages of virtualization.
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Reference Nodes Selection for Anchor-Free Localization in Wireless Sensor Networks
Šimek, Milan ; Makáň, Florian (referee) ; Diviš, Zdeněk (referee) ; Komosný, Dan (advisor)
Dizertační práce se zabývá návrhem nového bezkotevního lokalizačního algoritmu sloužícího pro výpočet pozice uzlů v bezdrátových senzorových sítích. Provedené studie ukázaly, že dosavadní bezkotevní lokalizační algoritmy, pracující v paralelním režimu, dosahují malých lokalizačních chyb. Jejich nevýhodou ovšem je, že při sestavení množiny referenčních uzlu spotřebovávají daleko větší množství energie než algoritmy pracující v inkrementálním režimu. Paralelní lokalizační algoritmy využívají pro určení pozice referenční uzly nacházející se na protilehlých hranách bezdrátové sítě. Nový lokalizační algoritmus označený jako BRL (Boundary Recognition aided Localization) je založen na myšlence decentralizovaně detekovat uzly ležící na hranici síti a pouze z této množiny vybrat potřebný počet referenčních uzlu. Pomocí navrženého přístupu lze znažně snížit množství energie spotřebované v průběhu procesu výběru referenčních uzlů v senzorovém poli. Dalším přínosem ke snížení energetických nároku a zároveň zachování nízké lokalizační chyby je využití procesu multilaterace se třemi, eventuálně čtyřmi referenčními body. V rámci práce byly provedeny simulace několika dílčích algoritmu a jejich funkčnost byla ověřena experimentálně v reálné senzorové síti. Navržený algoritmus BRL byl porovnán z hlediska lokalizační chyby a počtu zpracovaných paketů s několika známými lokalizačními algoritmy. Výsledky simulací dokázaly, že navržený algoritmus představuje efektivní řešení pro přesnou a zároveň nízkoenergetickou lokalizaci uzlů v bezdrátových senzorových sítích.
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