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computers, in-business networks, mobile computers, and home PCs to share information worldwide Today we even have cell phones, personal digital assistants (PDAs), and other devices that we can use to connect to the Internet and access e-mail, download MP3s, and do other tasks Because nearly everyone wants access to the Internet, implementing and troubleshooting Internet connectivity is a PC technician s bread and butter The CompTIA A+ Essentials (220-701) exam recognizes this and tests you on the details of installing and con guring a connection to the Internet It may be a legacy dial-up analog modem used to connect to an ISP through a phone line, or a broadband cable modem using the local cable company as the provider In this chapter, you will rst explore various Internet connectivity options, and then install and con gure your very own connection to the Internet

for ( i = 0; i < 10; i++ ) { DoThis(); DoThat(); DanceALittleJig(); }

In addition, both while and for can take advantage of the loneliest statement, the lone semicolon:

Cross-Reference Computer security is such an important component of a PC technician s training that the topic receives its own chapter in both the textbook and the lab manual Refer to 19 in Mike Meyers CompTIA A+ Guide: Essentials The next chapter in this lab manual, 19, includes additional lab exercises to build your security awareness

for ( i = 0; i < 1000; i++ ) ;

The preceding example does nothing 1,000 times. Actually, the example does take some time to execute. The initialization expression is evaluated once, and the modification and termination expressions are each evaluated 1,000 times. Here s a while version of the loneliest loop:

dirty bit, indicating that an eviction candidate needs to be written back to the backing store The caching-inhibited bit is used to flag pages in memory that should not, for either r^rformance or correctness reasons, be stored in the processor's cache hierarchy Instead, all references to such addresses must be communicated directly through the processor bus We will learn in Section 373 how this caching-inhibited bit is vitally important for communicating with I/O devices with memory-mapped control registers The translation memories are usually called page tables and can be organized either as forward page tables or inverted page tables (the latter are often called hashed page tables as well) At its simplest, a forward page table contains a page table entry for every possible page-sized block in the virtual address space of the process using the page table However, this would result in a very large structure with many unused entries, since most processes do not consume all their virtual address space Hence, forward page tables are usually structured in multiple levels, as shown in Figure 314 In this approach, the virtual address is decomposed into multiple sections The highest-order bits of the address are added to the page table base register (PTBR), which points to the base of the first level of the page table This first lookup provides a pointer to the next table; the next set of bits from the virtual address are added to this pointer to find a pointer to the next level Finally, this pointer is added to the next set of virtual address bits to find the final leaf-level page table entry, which provides the actual physical address and permission bits corresponding to the virtual address Of course, the multilevel page table can be extended to more than the three levels shown in Figure 314 A multilevel forward page table can efficiently store translations for a sparsely populated virtual address space, since leaf nodes are only needed for those portions.

i = 0; while ( i++ < 1000 ) ;

A new client has signed up with your rm, requesting that you evaluate their current Internet connectivity and recommend the best upgrade path for their 12-person of ce (six desktop PCs and two laptops) Your rst job is to assess what method they are currently using to connect to the

Some compilers will eliminate a loop containing only the semicolon and just set i to its terminating value (the value it would have if the loop executed normally). This is an example of code optimization. The nice thing about code optimization is that it can make your code run faster and more efficiently. The downside is that an optimization pass on your code can sometimes cause unwanted side effects, like eliminating the while loop just discussed. Some people turn optimization off during development for this reason. Getting to know your compiler s optimization capabilities and tendencies is a good idea. Read the documentation!