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Attacks on active network elements
Ščepko, Richard ; Kacálek, Jan (referee) ; Polívka, Michal (advisor)
The bachelor thesis deals with the topic of the security of computer networks. The tasks of the bachelor thesis are the attacks on active network elements with the aim of the catching of data between two users. In the created structure with a stellate topology, the user stations have connect to the active element (switch). In the thesis, the individual ways of attacks and the significance of ARP proceedings to MAC addresses have describ. Several programmes have use in order to take control over the device. Due to a big amount of these active elements the source code of the programmes had to be alter. The work with the programmes ARPtool and ARPoison demanded the operational system Linux, in our case the distribution of Ubunt. The programme WinArpAttacker could be set off under the system Windows XP as well. The achieved results and the description of the practical part are discuss in detail in the summary of the thesis. The result is the catching communication with the help of the programme WireShark.
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An Analysis of Selected Layer 2 Network Attacks
Lomnický, Marek ; Ráb, Jaroslav (referee) ; Ryšavý, Ondřej (advisor)
This MSc Thesis focuses on principles, practical performability and security against four attacks used in contemporary local-area networks: CAM Table Overflow capable of capturing traffic in switched networks, ARP Man-in-the-Middle, whose target is to redirect or modify traffic and against two variants of VLAN Hopping attack allowing a hacker to send and capture data from VLANs he has no access to.
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Hodnocení významu druhově pestrých směsí trav, jetelovin a bylin pro biodiverzitu
Fiodorová, Daniela
The aim of the study was to evaluate the species composition and proportion of agrobotanical plant groups in an established species-rich vegetation whitch was set up in 2022 in the first year of growth. Furthermore, the research aimed to determine the feeding value, diversity index, equitability and to assess the honey yield of the vegetation. The study investigated whether the date had an effect on the occurrence of pollinators in the vegetation and which groups of pollinators were most frequent. The vegetation was monitored using phytocenological imaging in a 1 m2 square plot in the centre of the experimental area. Insect abundance was assessed by observation directly in the plot and also by trapping in yellow trays. The recording in the first year of growth of the vegetation mixture showed high infestation. A total of 28 plant species were observed in the experimental plot. The agrobotanical group of herbs was not the most represented by number of species. The date had an effect (p<0,05) on the occurrence of Apis mellifera and the order Diptera. The order Diptera was the most abundant order during observations of infestations and pollinator capture.
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Abundance and habitat use of reintroduced populations of the Hermit (Chazara briseis) in the Czech Republic
Pešová, Lucie ; Sedláček, Ondřej (advisor) ; Vrba, Pavel (referee)
The Hermit (Chazara briseis) belongs to the critically endangered species in the Czech Republic. Its last population survived until recently in the NPR Raná in the České středohoří Protected Landscape Area, but it has gradually declined. The specie's habitat is short-stemmed grasslands, which are maintained mainly by extensive grazing and management. Currently, these sites are declining, traditional management has changed and the sites are gradually becoming overgrown. Therefore, the reconstruction of the butterfly's habitats has been undertaken in selected localities that the butterfly used to inhabit in the past, in the České středohoří Protected Landscape Area (PR Číčov, Dlouhá hora, PP Radobýl) and in the Český kras Protected Landscape Area (Třesina, Radotín). Reintroduction of eggs and caterpillars took place in these sites in 2020-2021. The aim of the thesis was to evaluate the population abundance and habitat use of the Chazara briseis at these sites immediately after reintroduction. I estimated the size of the populations using the mark-capture-recapture method in 2020 and 2021. The size of the populations in the Lonské středohoří (Dlouhá hora and Číčov) was around 400-500 individuals with a fairly balanced sex ratio. Overflights were also recorded between these sites, which may indicate...
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Didactic Game "Birds Trapping"
Kučerová, Eliška ; Dvořáková, Radka (advisor) ; Blažová, Kateřina (referee)
Creation of an authorial didactic game with the topic of birds' research and birds trapping is the aim of this master thesis. The game guides high school students from historical birds trapping to modern research trapping methods for the purpose of bird ringing and further research. For the purposes of this game there are firstly described principles and benefits of didactic games as well as the history of birds trapping mainly in the territory of today's Czech Republic. The didactic game deepens the students' knowledge of the topic, concurrently it touches on the history and geographical knowledge of our country. Students develop their cooperation, verbal communication and the search for solutions and compromises. The game is designed for the smaller class group, students cooperate in small groups (3 - 5 students) which compete. Authorial game was tested in diverse class groups. Based on these experiences was verified the suitability of the game for students and were described the problematic points in the game rules and in the whole concept of the game. Key words: educational game, authorial game, birds trapping, teamwork, communication
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Univerzálny sniffer a prekladač paketov protokolov na získavanie informácií o susediacich zariadeniach
Pálinkás, Adam
This bachelor thesis is dealing with creating a software capable of capturing different kinds of L2 protocols used for getting information about neighbouring devices developed by different vendors. In the first part, analysis of works solving similar topics and a theoretical description of each protocol. Next, the implementation of the software is described as well as the methodology of tests and results. The software was created in the programming language Java using the Pcap4J library to capture and send packets.
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Use of individual acoustic monitoring to detect changes of Yellowhammer song in time
Kouřil, Jan ; Petrusková, Tereza (advisor) ; Rubáčová, Lucia (referee)
Birdsong transmitted through populations and generations via social learning is one of the most famous and well-studied examples of culture in animal kingdom. Over time song may change as part of so-called cultural evolution which can be monitored in many ways. However, the most effective way to reveal the mechanisms driving the change of song over time is individual monitoring. In case of songbirds ringing and other invasive methods are the most usual methods for it. But these have issues like the need to capture the bird or difficulty of reading the rings in some environments. But if the vocalizations of a bird species are individually specific and stable over time, it is possible to monitor individuals of that species using only recordings of their vocalizations by individual acoustic monitoring (IAM). However, this non-invasive, fast and effective monitoring method is still very rarely used in birds. The aim of this study was to confirm that the repertoire of the initial phrases of the Yellowhammer (Emberiza citrinella) is individually specific and stable between years, making it a suitable species for individual acoustic monitoring. I confirmed this by visually analyzing spectrograms of recordings of 107 males detected over three years. I also verified my visual identification using two...
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Communities of small terrestrial mammals in the surroundings of Vltava river
ŠPILAUER, Tomáš
The bachelor thesis is dealing with the influence of watercourse on the biodiversity of small terrestrial mammals in landscape near river Vltava in South Bohemia. The theoretical part consists of literally review about diversity, ecotones, biocorridors, watercourses and about ecology of small terrestrial mammals. The aim of the practical part is to compare biodiversity, abundance of small mammals and compare impact of watercourses on small mammals. During 2021 vegetation sesion the CMR method with ear tags was used. During three-days long captures were laid 25 traps in 5 metres distances in each of the three studied biotope lines (Forest, Meadow, Shore). In total 136 individuals of small mammals were captured. The species, sex, weight, foot lenght and age of captured mammals were determined. Two species of small terrestrial mammals were captured (Myodes glareolus, Apodemus sylvaticus). In total of all 136 individuals were captured: 51 individuals of Myodes glareolus and 75 individuals of Apodemus sylvaticus. Significant difference in quantity was in the line Forest where were captured 23 Myodes glareolus and 45 Apodemus sylvaticus. In the line Forest were captured 68 individuals in total and the same number was captured in the line Shore (also 68 individuals). In the Meadow line no individual was captured.
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Efficiency of subaquatic light traps depending on a size of entrance hole and time of exposure
LIEBL, Lukáš
This bachelor thesis examines the capture of aquatic insects, using the subaquatic light trap method. The aim of this thesis is to determine in depth the extent of effectiveness of aquatic insects capture depending on two major factors. The size of the trap's entrance holes and the daylight exposure time (after the night capture). The result of this theses is the assessment of what size of the entrance holes is optimal for the capture of aquatic insects and how this entrance size affects the escape rate of individuals out of the trap. Moreover, the study examines whether the escape rate is affected by the exposure time of the light trap in the water. The experiments were conducted in the school educational garden of the Faculty of Education of the University of South Bohemia in České Budějovice during autumn 2015 and summer 2016, using aquatic light traps with different entrance hole sizes. As model organisms representatives were used species of water insect families Corixidae, Chaoboridae and Notonectidae.
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Breeding of salamanders in zoological gardens - analysis of trends and success
ONDRÁČEK, Michal
Amphibians are currently the most endangered group of verterbrates living on Earth, with populations in the wild declining rapidly due to pollution and loss of their habitat, trapping of individuals from nature, global climate change and spread of diseases. My work is focused on mapping the situation in tailed amphibians in zoos and aquariums all over the world. Using acces to the database of zoos ZIMS creates an overview of all breed species, institutions, which are engaged in their breeding and their results. An integral part of this work is a literary overview of the history of breeding amphibians in zoos, their protection and current ex situ projects.
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