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answer Suppose now that a CA goes down What is the impact of this failure
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1) Suppose that an intruder could both insert and remove DNS messages into the network Give three scenarios showing the problems that such an intruder could cause 2) No one has formally "proven" that 3-DES or RSA are "secure" Given this, what evidence do we have they are indeed secure 3) If IPsec provides security at the network layer, why is it that security mechanisms are still needed at layers above IP 4) Go to the International PGP homepage (http://wwwpgpiorg/) What version of pgp are you legally allowed to download, given the country you are in
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Network Managment - Introduction
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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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