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Sandboxes versus Signatures Do digital signatures make ActiveX more attractive security-wise than Java No, especially in light of the fact that digital signature capability became available in Java's JDK 1.1 and, in combination with finegrained access control, plays a major role in Java 2 security. That means in Java, you get everything that ActiveX is doing for security plus the ability to run untrusted code fairly safely. Another significant factor is that the sandbox approach is more robust in the face of accidental bugs in mobile programs. Even if the sandbox isn't bulletproof, it will most likely prevent a bug in a mobile program from trouncing important data or programs by mistake. As we shall see in 3, when combined with access control, code signing allows applets to step outside the security sandbox gradually. In fact, the entire meaning of sandbox becomes a bit vague. As an example of how Java code-signing might work, an applet designed for use in an Intranet setting could be allowed to read and write to a particular company database as long as it was signed by the system administrator. Such a relaxation of the security model is important for developers who are chomping at the bit for their applets to do more. Writing code that works within the tight restrictions of the sandbox is a pain, and the original sandbox is very restrictive.

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5 years of vendor support for the clustering software: ($3,132 per year): $15,660 Clustering software training for two students: $6,000 Clustering software implementation services: $12,000 LVM and filesystem software for the second node: $6,000 5 years of LVM and filesystem software support for the second node ($1,380 per year): $6,900

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Having made our way through the first seven chapters of this text, we're now well aware that a network consists of many complex, interacting pieces of hardware and software - from the links, bridges, routers, hosts and other devices that comprise the physical components of the network to the many protocols (in both hardware and software) that control and coordinate these devices When hundreds or thousands of such components are cobbled together by an organization to form a network, it is not surprising that components will occasionally malfunction, that network elements will be misconfigured, that network resources will be overutilized, or that network components will simply "break" (eg, a cable will be cut, a can of soda will be spilled on top of router) The network administrator, whose job it is to keep the network "up and running," must be able to respond to (and better yet, avoid) such mishaps With potentially thousands of network components spread out over a wide area, the network administrator in a network operations center (NOC) clearly needs tools to help monitor, manage, and control the network In this chapter, we'll examine the architecture, protocols, and information base used by a network administrator in this task Before diving in to network management itself, let's first consider a few illustrative "real-world" nonnetworking scenarios in which a complex system with many interacting components must monitored, managed, and controlled by an administrator Electrical power-generation plants (at least as portrayed in the popular media, eg, movies such as the China Syndrome) have a control room where dials, gauges, and lights monitor the status (temperature, pressure, flow) of remote valves, pipes, vessels, and other plant components These devices allow the operator to monitor the plant's many components, and may alert the operator (the famous flashing red warning light) when trouble is imminent Actions are taken by the plant operator to control these components Similarly, an airplane cockpit is instrumented to allow a pilot to monitor and control the many components that make up an airplane In these two examples, the "administrator" monitors remote devices and analyzes their data to ensure that they are operational and operating within prescribed limits (eg, that a core meltdown of a nuclear power plant is not imminent, or that the plane is not about to run out of fuel), reactively controls the system by making adjustments in response the changes within the system or its environment, and proactively manages the system, eg, by detecting trends or anomalous behavior that allows action to be taken before serious problems arise In a similar sense, the network administrator will actively monitor, manage and control the system with which s/he is entrusted In the early days of networking, when computer networks were research artifacts rather than a critical infrastructure used by millions of people a day, "network management" was an unheard of thing If one encountered a network problem, one might run a few pings to locate the source of the problem and then modify system settings, reboot hardware or software, or call a remote colleague to do so (A very readable discussion of the first major "crash" of the ARPAnet on October 27, 1980, long before network management tools were available, and the efforts taken to recover from and understand the crash is [RFC 789]) As the public Internet and private intranets have grown from small networks into a large global infrastructure, the need to more systematically manage the huge number of hardware and.

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