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This is especially dangerous for machines connected to the Net How can we be sure that a program that someone says is useful hasn't been hijacked to do something nasty When it works flawlessly, the Java security model provides one possible answer to this question, as it was designed to allow untrusted programs to be run on a computer safely As we will see, the base Java security model is meant to counter the threat of viruses and other forms of attacks But in the early days of the Net, Java did not yet exist (To be completely accurate, Java was evolving in the early 1990s from an embedded platform called Oak that was meant to be used for smart devices like that Internet-enabled toaster you've heard so much about) Back to our history .

Cisco has a device that routes traffic from a Fibre Channel SAN onto an iSCSI network; this method of joining the two networks together may well turn out to be the panacea that drives both types of SANs into wider acceptance..

[Wakeman 1992] Ian Wakeman, Jon Crowcroft, Zheng Wang, and Dejan Sirovica, "Layering considered harmful," IEEE Network, January 1992, p 7 Return to Table Of Contents

Copyright Keith W Ross and Jim Kurose 1996-2000

The InfiniBand architecture is a very high speed interconnect between servers that are physically close together. InfiniBand speeds can reach 30Gbit per

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The question in the late 1980s was, how could a user be sure that a program had not been hijacked (or Trojan'ed) Checksumming provided part of the answer A checksum is a simple computation performed on a piece of code to provide a digest, or "thumbprint," of a program (Combine this with digital signatures and you have a system that can provide both data integrity and authentication, which is most desirable, as we will discover in 3).

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second, with extremely low latency Unlike the better-known PCI bus, InfiniBand is point-to-point; it requires a switch to connect multiple devices, and software for node management It was originally designed to offer faster I/O to computers with ever-increasing CPU and memory speeds, because there were concerns whether other I/O transports, such as PCI, would be able to keep up with the demands that the other components were placing When InfiniBand was first announced, expectations were extraordinarily high It was going to replace every networking infrastructure in existence, and probably put an end to world hunger Once expectations were ratcheted back, and InfiniBand was targeted as a data-center-only solution to interconnect servers at a very high speed, it became a much more realistic proposal InfiniBand makes great sense as a clustering interconnect, and as a way to share and move extremely large amounts of data relatively short distances.

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(A good cluster interconnect is one that can send relatively small amounts of data over short distances at high speed with very low latency Cluster members need up-to-the-second information about state changes in other members A good storage interconnect, on the other hand, needs to be able to share large amounts of data, with high speed, as well as with moderate, but predictable, latency) Although it will require new hardware, InfiniBand does not require an expensive new wiring infrastructure because the systems it will connect will be physically close together It will, however, require dedicated switches and other networking hardware Until it is more widely accepted, systems will require an adapter board that will allow a connection to be made into the InfiniBand network fabric.

Not many people were into checksums back then, but they existed for at least a few anonymously downloadable programs. Of course, who was to say that a program's checksum hadn't been tampered with In reality, most people either ignored the risks or chose to live with them. Skipping the advent of gopher, which most people pretty much ignored anyway, the next big thing was the Web. As discussed in the last section, the Web got its start in 1992. At first, the Web was static. Java changed all that, making it possible for a Web server to provide programs as content. Java applets are these programs. The dangers of mobile code and systems for addressing these dangers are the focus of this book. But there's still a drawback, even with the power that Java adds to the Web-the only way to tell when new content has been added to a Web page is to surf back over and find out. That's where push technology comes in.

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