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Virtualization is an approach to IT that pools and shares(1)so that utilization is optimized and supplies automatically meet demand. Traditional IT environments are often silos, where both technology and human(2)are aligned around an application or business function. With a virtualized(3), people, processes, and technology are focused on meeting service levels,(4)is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible. We offer a broad spectrum of virtualization(5)that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources.

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NAC's (Network Access Control) role is to restrict network access to only compliant endpoints and(1)users. However, NAC is not a complete LAN(2)solution, additional proactive and(3)security measures must be implemented. Nevis is the first and only comprehensive LAN security solution that combines deep security processing of every packet at 10 Gbps, ensuring a high level of security plus application availability and performance. Nevis integrates NAC as the first line of LAN security(4). In addition to NAC, enterprises need to implement role-based network access control as well as critical proactive security measures—real-time, multilevel(5)inspection and microsecond threat containment.

DOM is a platform-and language(1)API that allows programs and scripts to dynamically access and update the content, structure and style of WWW documents (currently, definitions for HTML and XML documents are part of the specification). The document can be further processed and the results of that processing can be incoporporated back into the presented(2). DOM is a(3)-based API to documents, which requires the whole document to be represented in(4)while processing it. A simpler alternative to DOM is the event-based SAX, which can be used to process very large(5)documents that do not fit into the memory available for processing.

1．When the electricity is switched off, the ROM is cleared ofits contents, the RAM is not.
2．IF-THEN-ELSE structures in a programming language provide selection.
3．A program in its original form is known as an object program, and the translated version is known as a source program.
4．The CPU is the most important piece of hardware in the entire system and yet one of the simplest.
5．The lowercase letters come after the uppercase letters in the ASCII table.
6．Queue insertions and deletions are made at the same end ofthe queue.
7．Improvements in software quality are necessary to reduce program maintenance costs.
8．A recursive procedure is one that activates itself during its activations.
9．A floppy diskette machine is an example of a direct access storage device.
10．Comments specify actions for a computer to perform when a program is run.

Melissa and Love Letter made use of the trust that exists between friends or colleagues. Imagine receiving an(1)from afriend who asks you to open. This is what happens with Melissa and several other similar Email(2). Upon running, such worms usually proceed to send themselves out to Email addresses from the victim's address book, previous Emails, web pages(3).
As administrators seek to block dangerous Email attachments through the recognition of well-known(4), virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.
Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the(5)access to your network.