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In a similar fashion, the linker tells File 1 where the function display( ) is located so that it can be called When the compiler generates the object code for display( ), it substitutes a placeholder for the address of count because the compiler has no way of knowing where count is The same sort of thing occurs when main( ) is compiled The address of display( ) is unknown, so a placeholder is used When these two files are linked together, these placeholders are replaced with the addresses of the items Whether these addresses are absolute or relocatable depends upon your environment Relocatable vs Absolute Code For most modern environments, the output of a linker is relocatable code This is object code that can run in any available memory region large enough to hold it In a relocatable object file, the address of each call or load instruction is not fixed, but is relative Thus, the addresses in relocatable code are offsets from the beginning of the program When the program is loaded into memory for execution, the loader converts the relative addresses into physical addresses that correspond to the memory into which the program is loaded For some environments, such as dedicated controllers in which the same address space is used for all programs, the output of the linker actually contains the physical addresses When this is the case, the output of the linker is absolute code Linking with Overlays Although no longer commonplace, C compilers for some environments supply an overlay linker in addition to a standard linker An overlay linker works like a regular linker but can also create overlays An overlay is a piece of object code that is stored in a disk file and loaded and executed only when needed The place in memory into which an overlay is loaded is called the overlay region Overlays allow you to create and run programs that would be larger than available memory, because only the parts of the program that are currently in use are in memory To understand how overlays work, imagine that you have a program consisting of seven object files called F1 through F7 Assume also that there is insufficient free memory to run the program if the object files are all linked together in the normal way-you can only link the first five files before running out of memory To remedy this situation, instruct the linker to create overlays consisting of files F5, F6, and F7 Each time a function in one of these files is invoked, the overlay manager (provided by the linker) finds the proper file and places it into the overlay region, allowing execution to proceed The code in files F1 through F4 remains resident at all times Figure 12-1 illustrates this situation As you might guess, the principal advantage of overlays is that they enable you to write very large programs The main disadvantage and the reason that overlays are usually a last resort is that the loading process takes time and has a significant impact on the overall speed of execution For this reason, you should group related functions.

Open Shortest Path First (OSPF) is the most commonly used IGP in the entire Internet Most large Internet users (as opposed to ISPs) use OSPF on their internal networks Even an AS, while still using BGP on its edge routers, will use OSPF internally because OSPF was designed from the ground up to work within a single AS OSPF converges dramatically faster and is much more efficient than RIP Odds are good that if you are using dynamic routing protocols, you re using OSPF Before you see OSPF in action, I need to warn you that OSPF is a complex protocol for routers You won t find OSPF on cheap home routers because making it work takes a lot of computational firepower But OSPF s popularity and CompTIA s coverage make this an important area for you to understand The description here, while more than enough to get you through the CompTIA Network+ exam, is still only a light touch on the fascinating world of OSPF NOTE Even though OSPF takes serious router firepower, it s usually embarrassingly easy to implement In many cases you just tell your router to use it and it works perfectly Let s head back to the four-router setup used to explain RIP, but this time replace RIP with OSPF Since OSPF is designed to work with the Internet, let s give Router B an upstream connection to the organization s ISP When you first start up OSPF-capable routers, they send out link state advertisements (LSAs), called Hello packets, looking for other OSPF routers (Figure 8-33)

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