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The basic concept of a VPN is to provide a secure , point-to-point connection across the network between communicating entities A couple of words about security are important to keep our paranoia in check The first question is How much security is enough To answer that question, we must consider the impact on our business if the data we are sending is: 1 2 3 4 Simply Lost Is there a backup mechanism for sending or recovering the data Found by another business (not a competitor) Found by a competitor Actively pursued by a competitor

14-5

Figure 3-8

In the last case, we must ask How much effort is the competitor willing to invest to get our data The answer to these questions will help us decided how much security is enough Note that in the foregoing example, one can equally substitute the word hacker for competitor

.

There are five ways to create a VPN as follows: 1 2 3 4 5 Between desktops Between routers Between firewalls Between VPN specific boxes Integrated boxes

it offers The design allows Chew Toy s saws to strike an opponent and keep on spinning and doing damage instead of stopping abruptly The motors that power the saws are mounted on a support structure welded to the front of the robot The saw motors also run on 24 volts instead of the recommended 12 When in battle, these motors get only intermittent use; thus, the reduction in life span from this hard usage should not pose a problem If one motor should blow out during a competition, the second one will be able to power the saws These motors were found through a surplus supply catalog Although I had no specs on their design, and I knew nothing about who made them, they were inexpensive and testing proved they had the necessary torque and would work well for their intended purpose The arm was originally intended to right the robot if it were turned on its back, but then it became a weapon in its own right The arm is made out of angle iron bought from a local hardware store Welded onto the ammo box and attached to the front is a little bent piece of steel with a hook The initial welding on Chew Toy was farmed out, and one of my teammates who had welding equipment (and skill at using it) did later welds The original arm conception has evolved considerably, and the appearance changed as we continued our improvisation Things were added as the inspiration hit us The old motherboard and perforated metal screening were attached as armor The 2-by-4 with nails was incorporated to make sure the robot could right itself should it be flipped The nails, and the reach they added, were necessary to accomplish the flipping When the arm is lowered (Figure 14-5), the nailed 2-by-4 gives the robot additional protection More of the armor in the form of circuit boards, perforated metal, and another 2-by-4 to protect the robot s rear was added when construction was nearing completion.

a snowflake schema wherein the product dimension is made up of three tables It is a simple matter to write a query that combines those tables into a single view or, in DSV terms, a named query In other words, writing a standard relational query, and then naming it, makes it appear on the DSV just like any other table Figure 3-9 shows the same DSV as before, but the three product tables have been replaced with a single named query called DimProductStar DimProductStar contains the columns from DimProduct, DimProductSubcategory, and DimProductCategory in a single virtual table Creating a named query changes absolutely nothing in the underlying database; it is merely a logical construct in the DSV Named queries are easy to identify because the symbol next to the name looks like two small tables as opposed to a single large table icon used for physical tables Named calculations are similar to named queries in that they are logical constructs that exist only in the DSV However, named calculations appear as a column in an existing table As the name suggests, these new columns may be used to perform

Although not normally considered a VPN, one can certainly use desktop PCs to encrypt data and send it across the Internet securely Additionally, software is available that runs on a desktop capable of creating a VPN to a firewall or stand-alone VPN device Most VPN equipment vendors offer corresponding software that runs on a laptop or desktop in order to provide a secure path to the home office over the Internet Most of the discussion then involves creating a VPN between business locations, branch offices, and road warriors

.

Figure 3-9