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Most typical network users do not care about all the protocols and mechanisms that are in use to get their data; they just care that they get it. Because you are not the typical network user, however, you should care how this data gets there. Networks of all sizes produce conditions that are less than optimal, so actions have to be taken to address these needs. If there were no way to control the ow of data, the networking world would be a mess. If you worked in an organization that only used several thousand 10/100 Mbps Ethernet hubs, you would nd that the end users would be less than satis ed (especially if you consider the types of data that are owing in a normal LAN). What should you concern yourself with in relation to operations at the Data Link layer POP QUIZ within a network This question The Data Link layer is what layer of the OSI is the reason this section is in reference model the book. There are a lot of considerations to be aware of if you want to have an understanding of good old Layer 2. In general, the Data Link layer must provide mechanisms for framing, addressing, and detecting errors in data that is being sent to and fro over the physical link. The framing mechanisms provide a way for the frames to be delimited. Node addressing identi es the source and destination for communication on the LAN. Error detection ensures that only good data is received at the destination and then delivered to the upper layers. In some cases, the Data Link layer discards any errors it discovers, or it may employ a recovery mechanism it all depends on which action it was designed to do.

You can quickly nd customers by name, account number, or phone number. Related transactions either all happen or all don t happen. You can recover from computer failure. The data is safe. You can move to a bigger database when your need grows.

In the previous chapter, I explained that pop-up blockers work by inspecting incoming Hypertext Markup Language (HTML), Extensible Markup Language (XML), JavaScript, and other markup or code to look for evidence of pop-up advertisements If such evidence appears, the browser is instructed not to open a new Window; if no such evidence is found, it s allowed to proceed Blocking spyware and adware can be a bit trickier because there s more, and more complex, code to read and decipher and because, in far too many cases, users deliberately (but usually neither consciously nor willingly) initiate the downloads without knowing that adware, spyware, or malware elements may lurk within their contents This is where recognition by element name (especially items like file names, DLL names, or registry keys and values) can usually permit identification to occur before requests to write such elements are allowed to go through.

- 0,2 .

This works fine for known items of spyware and adware, because they have already been analyzed, profiled, and their telltale characteristics recorded and enshrined in various databases But what about new spyware or adware that hasn t yet been dissected or cataloged That s why certain characteristic behaviors are often flagged for alerts by anti-spyware/anti-adware programs Thus, when you install legitimate Windows programs that add to the Windows Startup Items, you ll be queried just to make sure those changes are on the up-and-up They can t proceed until you give your permission, on the theory that you ll be expecting this interaction when you re installing wanted software, and warned about potential problems when unwanted software is trying to install itself.

Properties: Here you choose the properties that you want to filter. (Most of these properties are covered in the next chapter.) The drop-down list includes all properties in the drawing s database; these properties depend on the object type you chose. You can choose only one property. The values in the next two sections depend on your choice in the Properties section. If you want to create a filter that specifies criteria for more than one property, use the FILTER command. Operator: After you ve chosen a property, you can set it equal to or not equal to a certain value. You can set certain properties as greater than or less than a value. You can also use wildcard matching characters (such as * and ) for editable text. Choose the desired operator from the drop-down list. Value: Here you finally choose the value for your property. For example, you can set the color equal (or not equal) to green or the linetype equal to DASHED. Choose the desired value from the drop-down list or enter a value in the text box.