This paper investigates the impact of various encryption techniques

Abstract-Denial of Service (DoS) attacks is one of the major threats and among the hardest security problems in the Internet world. Of particular concern are Distributed Denial of Service (DDoS) attacks, whose impact can be proportionally severe. With little or no advance warning, an attacker can easily exhaust the computing resources of its victim within a short period of time. In this paper, we study the impact of a UDP flood attack on TCP throughput, round-trip time, and CPU utilization for a Web Server with the new generation of Linux platform, Linux Ubuntu 13. This paper also evaluates the impact of various defense mechanisms, including Access Control Lists (ACLs), Threshold Limit, Reverse Path Forwarding (IP Verify), and Network Load Balancing. Threshold Limit is found to be the most effective defense.

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Using simulation and modelling, the other-cells interference factor for CDMA systems is obtained. Situations with tiers of neighbouring cells are investigated under various propagation parameters and for two scenarios, when the mobile chooses the nearest base station, and when it chooses the base station with the strongest signal as home cell. The results presented indicate that in most situations the other-cells interference factor can be significantly less than the upper bounds result published previously. It is concluded that it is enough to compare the link attenuation of three neighbouring cells to find the home cell.

Abstract-The performance of category 5e and 6 cabling is compared for both IPv4 and IPv6 using Gigabit Ethernet LAN. The maximum bandwidth achieved was 700Mbps and it was for IPv4 and category 5e cabling.

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