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Simulation scenarios for analysis of behavior of transport networks
Koláčková, Aneta ; Koton, Jaroslav (referee) ; Jeřábek, Jan (advisor)
This master’s thesis deals with the issue of mobile networks, protocol suite TCP/IP and routing protocols. It focuses in particular on the functioning of the transport part of the third and fourth generation mobile networks and intends to fnd the most suitable options for their emulation. The master’s thesis compares two selected emulation programs through a series of tests that were performed on a server created for these purposes. The main outputs are two detailed comprehensive scenarios and solutions have been developed. The frst scenario deals with the overall transport network confguration. The second scenario is based on the frst one and is focused on troubleshooting of particular issues in this network. Their implementation helps to analyze the behavior of the transport part of the mobile network.
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Routing among autonomous systems in Internet
Daněk, Michal ; Komosný, Dan (referee) ; Novotný, Vít (advisor)
Bachelor thesis describes the architecture of the Internet, its division into autonomous system and methods of their interconnection. Furthermore extensively describes routing mechanisms among autonomous system but also inside. More space is dedicated to routing protocols OSPF and BGP. At the end of the work is designed laboratory task for subject Network Architecture where this protocols are used.
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Proposal of the secure network model
Kis, Matej ; Rosenberg, Martin (referee) ; Babnič, Patrik (advisor)
The goal of this work was to create a design of a secured network infrastructure with decribing different ways of securing at ISO/OSI layers. Create a list of protocols which can be used to achieve a secured network design. In the theoretical part of this work the attention was placed to analyze possible solutions, which can be appllied in a practical part of the work. The practical part involves a design of a network topology and simulation. The part of the simulation was device configuration and network security testing.
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Measurement of qualitative parameters in the access network
Kejík, Tomáš ; Slavíček, Karel (referee) ; Grenar, David (advisor)
The theme of this bachelor’s thesis is „Measuring of qualitative parameters in an access network.“ The aim of this paper is a characterization of multimedia broadcasts in access networks and the creation of a functional network generator. The theoretical part of the paper is dedicated to analyzing key broadcasting parameters, which affect the resulting quality of network broadcast. Furthermore, used network protocols that are given for network and multimedia broadcast are analyzed. Simulation is done by using of GNS3 software. After that, transferred data were measured. Side effects affecting the functionality of the resulting transmission were subsequently analyzed. Another part of the paper is the practical part, which is focused on creation of a network generator by using the Bash language and making a script to facilitate turning on the generator for different counts of clients. At the end of the paper, the broadcast parameters were evaluated.
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Protocols Analysis of CISCO Networks
Karlík, Martin ; Kenyeres, Martin (referee) ; Škorpil, Vladislav (advisor)
ABSTRACT Bc.Karlík, Martin Department of Telecommunications, Faculty of Electrical Engineering and Communication, Brno University of Technology. Analysis of CISCO networking protocols This semestral thesis is focused on CISCO networks and protocols like MPLS, BGP, Ipv4, Ipv6, Multicast – sprase / dense mode. The task was study of those protocols and design and implement lab excercise with one of those protocols by using free network simulator GNS3. In this excercise is used CISCO router 3745.
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Application of simulation model of access network
Szymeczek, Andrzej ; Sládok, Ondřej (referee) ; Grenar, David (advisor)
The topic of the diploma thesis is " Application of simulation model of access network". The aim of the thesis was to create a part of the access network in which were tested simulations for TCP and UDP traffic. The theoretical part of the thesis deals with general information about the GNS3 program and the possibilities which this program allows. The next part of the thesis describes the Mikrotik RouterOS program, which was used in the topology. The next section describes the types of routing in IP networks, as well as the types of packet delivery. The practical part deals with the creation of test topologies and verification of the performance of the simulation tool. Furthermore, the practical part deals with the programming of a network generator for TCP and UDP traffic in the network. The generator was created by using a Bash script and a combination of the dd and nc commands. At the end, the thesis describes the results of simulations in terms of transmission speed, network throughput, packet size distribution and in the case of TCP also bidirectional delay – RTT.
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Evaluation of MPLS approach as a WAN technology for data transmissions in critical information infrastructure
Formánek, Juraj ; Blažek, Petr (referee) ; Fujdiak, Radek (advisor)
Thesis deals by using MPLS technology in energy critical information infrastructure and its comparison with another modern approach in the area of the WAN management. For this purpose was chosen a Software-defined Wide Area Network technology. This thesis contains theoretical description and practical tests of particular MPLS technologies on the WAN topology, which is considered as a virtual real topology of the EG.D’s company. Test were simulated in GNS3 emulator, using Cisco routers. Practical test were firstly focused on availability test when link or node failure occurs and secondly on route- reflector failures. Conclusion sums up appropriate approach for data transmissions in critical information infrastructure based on informations or practical test in this thesis.
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Application for automatic control of CISCO device configuration
Zbořil, Tomáš ; Jeřábek, Jan (referee) ; Kubánková, Anna (advisor)
The problem of mismatched running configurations on the networking devices is common and it is not always easy to troubleshoot. Another problem of the same scale is an analysis of the routing information in routers, its heterogeneity in terms of dynamic routing protocols, numerous various settings, and last but not least, management of these protocols. These problems require a software solution that would be helpful in analysis and would allow for automated addressing of problems found during the analysis. This master's thesis attempts to do this by designing and implementing such program for the protocol OSPFv2. It uses the SSH protocol to allow for retrieval of running configuration files from the devices and their comparison to the user-added configuration files. SSH protocol is also used to run commands on the devices and to gather their outputs, which are subsequently analysed. The output of the analysis is used in automated error correction, the correctness of which, is checked by the presence of the routes on the routers to the rest of the network.
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Basic properties of network protocols and communication techniques
Cigánek, Josef ; Jeřábek, Jan (referee) ; Dvořák, Jan (advisor)
The diploma thesis is focused on the basic properties of network protocols. The main task is to create laboratory tasks that deal with the basic features of network protocols and communication techniques, along with detailed instructions for students of communication technologies. The theoretical part of thesis acquaints the reader with the topic of computer networks and the basic network protocols of the TCP/IP architecture, which occur within the created lab. The practical part contains a selection of testing environment and subsequent description of installation and preparation of selected GNS3 environment. Finally are presented labs, which have been created. First lab deals with the basic differences between TCP and UDP. The second lab is focused on the issue of multicast and the third deals with the basics of penetration testing.
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Active security equipment in computer networks
Škrdla, Vojtěch ; Martinásek, Zdeněk (referee) ; Malina, Lukáš (advisor)
The main object of this bachelor's thesis is to describe problematics of active security devices. The thesis is mainly focused on firewalls. Thesis is divided into several topics, in which we describe types of security devices, division of firewalls, description of their advantages and disadvantages, types of VPN. The practical part describes the security design of mid-sized computer network, description of software that was used to test this network and the last part focuses on designing laboratory tasks with firewalls Cisco ASA5520 and Checkpoint Gaia R77.
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