Wednesday, October 7, 2009

Protect Network

The threat of email viruses & Trojans

The widespread use of email has provided hackers and crackers with an easy way to distribute harmful content to the internal network. Hackers can easily circumvent the protection offered by a firewall by tunneling through the email protocol, since it does not analyze email content.

CNN reported says that the MyDoom virus cost companies about US$250 million in lost productivity and tech support expenses, while NetworkWorld (September 2003) cited studies that placed the cost of fighting Blaster, SoBig.F, Wechia and other email viruses at US$3.5 billion for US companies alone.

Furthermore, email is also used to install Trojans, targeted specifically at your organization to obtain confidential information or gain control of your servers. Described as "instructive viruses" or "spy viruses" by computer security experts, these can be potent tools in industrial espionage. A case in point is the email attack on Microsoft's network in October 2000, which a Microsoft Corp. spokesman described as "an act of industrial espionage pure and simple". According to reports, Microsoft's network was hacked by means of a backdoor Trojan virus maliciously emailed to a network user.


Assignment Lanka Tag Cloud
Computer Networks The History of Local Area Networks, LAN, The Topologies of a Networks, LANs describe different types of transmission Medias, Local Area Networks Access Methods, Carrier Sense Multiple Access with Collision Detect, Development of LAN Technologies. LAN -Token Ring, LAN Ethernet Digital, LAN - Ethernet Sun microsystems, LAN - Ethernet Mixed Environment, LAN - Token Ring was introduced by IBM LAN - IBM implementation of Token Ring, Token Ring Novell, LAN Token Ring - in a mixed environment, LAN - Fiber Distributed Data Interface, LAN - ATM, LAN Components, LAN Switching Methods, Virtual Local Area Network, Port based VLAN, Mac based VLAN, Protocol based VLAN, User Base VLAN, PC networks Components, PC networks Shared resources, PC Network operating systems, PC networks Novell Netware, PC networks Windows NT, PC networks IBM LAN Server Computer Programming Languages HTML Language, The Generations of Programming Languages, Different types of High Level Languages, Different types of High Level Languages Disadvantages
Computer Networks - IBM LAN Server, Windows NT Networks, Novell Netware, Network operating systems, Networks Shared, Networks Components, User Base, Protocol based, Mac based, Port based, VLAN, LAN Switching, LAN Components, ATM, Fiber Data, Token Ring, Token Ring Novell, IBM implementation, Ethernet, Sun microsystems, Ethernet Digital, Token passing, LAN Technologies, CSMA/CD, Access Methods, Transmission, Networks, The History of Local Area Networks, LAN