Pathan, Risat MahmudAhmed, IbrarFaruqe, Farhana2010-10-122010-10-1220072007-09ID 03201079ID 03101094http://hdl.handle.net/10361/480This thesis report is submitted in partial fulfillment of the requirements for the degree of Bachelor of Science in Computer Science and Engineering, 2007.Cataloged from PDF version of thesis report.Includes bibliographical references (page 85).Security in computer and computer network is of great importance now-a-days. Identifying attacks and taking appropriate measure by system administrator is of special concern. This paper is a study and proposal of an Intrusion Detection System (IDS) for a hypothetical computer network that provides security to Transport and Network Layer attacks in a computer network protocol stack. The proposed system uses visualization (Graphic User Interface) to notify a System Security Officer (SSO) of possible threats and help him/her to take appropriate action to mitigate the effect of attack or to protect the attack before harm is being done. A detailed design of the network IDS has been proposed and criteria for evaluating an IDS is demonstrated. Keywords: IDS, TCP/IP, Intrusion, Distributed system, Firewall, Visualization85 pagesBRAC University thesis are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission.IDSTCP/IPIntrusionDistributed systemFirewallComputer science and engineeringVisualizationThesis