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As you can see, OSPF areas almost instantly gain convergence compared to RIP Once convergence is reached, all of the routers in the area send each other LSA Hellos every 30 minutes or so unless they detect a break in the link state Also notice that OSPF routers keep alternate routes to the same network ID So what happens when something changes For example, what if the connection between Routers A and B were to disconnect In that case both Routers A and B would almost instantly detect the break (as traffic between the two would suddenly stop) Each router would first attempt to reconnect If this was unsuccessful (over a few seconds), the routers would then send out an LSA announcing the connection between the two was broken (Figure 8-38) Again, this is a single route, not the entire routing table Each router updates its routing table to remove the route that no longer works OSPF isn t popular by accident It s easy to use, scales to large networks quite well, and is supported by all but the most basic routers By the way, did I forget to mention that OSPF also supports authentication and that the shortest-path-first method by definition prevents loops Why would anyone use anything else Well, OSPF had one problem that

To force the compiler to use the real function, you need to prevent the compiler from substituting the macro when the function name is encountered Although there are several ways to do this, by far the best is simply to undefine the macro name using #undef For example, to force the compiler to substitute the real abs( ) function for the previously defined macro, you would insert this line of code near the beginning of your program:

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Cost to Network ID X through Router A = 0 Cost to Network ID Y through Router C = 20 Cost to Network ID Y through Router B = 12

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Then, since abs is no longer defined as a macro, the function version is used Redefinition of Library Functions Although linkers may vary slightly between implementations, they all operate in essentially the same way For example, if your program consists of three files called Fl, F2, and F3, the linker command line looks something like this, LINK F1 F2 F3 LIBC where LIBC is the name of the standard library

Cost to Network ID Y through Router D = 0 Cost to Network ID X through Router C = 20 Cost to Network ID X through Router C = 12 D

Auto-dialing time savings Dialing a telephone number manually (including the time to look up the number if necessary and provide any applicable billing information) can take from 15 seconds to a few minutes In contrast, the time needed to instruct a CTI application to call a person might be 1 10 seconds Given the thousands of telephone calls made by computer users each year, the potential time savings are staggering

NOTE Some linkers automatically use the standard library and do not require that it be specified explicitly Also, integrated programming environments often include the appropriate library files automatically

As the link process begins, usually the linker first attempts to resolve all external references by using only the files F1, F2, and F3 Once this is done, the library is searched if unresolved external references still exist Because most linkers proceed in the order just described, you can redefine a function that is contained in the standard library For instance, you could create your own version of fwrite( ) that handled file output in some special way In this case, when you link a program that includes your redefined version of fwrite( ), that implementation is found first and used to resolve all references to it Therefore, by the time the library is scanned, there are no unresolved references to the fwrite( ) function, and it is not loaded from the library You must be very careful when you redefine library functions because you could be creating unexpected side effects Another part of your program might use the library function that you are redefining In this case, the other part will be expecting the library function but will get your redefined function instead For example, if you redefine fwrite( ) for use in one part of a program and another part of your program uses fwrite( ), expecting it to be the standard library function, then (to say the least) unexpected behavior may result It is a better idea simply to use a different name for your function than to redefine a library function

Also keep in mind that routers, especially gateway routers, often have a large number of other features that have nothing to do with routing Gateway routers, since they act as a separator between the computers and The Big Scary Rest of the Network, are a convenient place for all kinds of handy features like DHCP, protecting the network from intrusion (better known as firewalls), and NAT

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