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One of the pitfalls of networking environments is that the electrical signal that is traveling the wire is weakened over distance as a result of outside interference Eventually, if two systems are too far from one another, the signal is so weak that by the time it reaches the other side it is unreadable This is where repeaters come in

To review the details of device installation, refer to the Installing Expansion Cards section in 8 of Mike Meyers CompTIA A+ Guide to Managing and Troubleshooting PCs

FIGURE 3-16

WebOS includes full support for HTML 5 Database objects Like their server brethren, these databases have tables and are queried using the SQL query language Like Depots and Cookie objects, databases are unique per application To create a database, use the openDatabase() method To query a database, use the executeSQL() method WebOS applications using databases need to be careful to avoid SQL injection, a common web application vulnerability Similar to script injection, this vulnerability results from inserting unescaped user data directly into queries Depending on the application, this may allow malware to corrupt the application s database or steal sensitive data The risk on WebOS is smaller than the risk to web applications because databases are per-application and there aren t different authentication stages Even though the risk is less, it is worth preventing SQL injection by using parameterized queries and never building SQL queries using string concatenation Parameterized queries are created by using the placeholder instead of the actual value when authoring the query The parameter s value is then provided in a separate argument array Because the query and the data are provided separately, the database engine does not become confused and accidentally interpret the user data as part of the queries executable portion Here s an example:

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In this lab, you ll practice removing and installing internal expansion cards At the end of this lab, you ll be able to

3:

FIGURE 3-17

At least one working Windows computer with expansion cards installed A Phillips-head screwdriver An anti-static mat and wrist strap Anti-static storage bags A notepad

transactionexecuteSql( SELECT * FROM Vulnerabilities WHERE Id = , [ vuln_id ], onSuccess, onError);

If your network layout exceeds the normal speci cations of the cable, you can use repeaters to allow the signal to travel the distance by placing the repeaters at different points in the Because a repeater works network For example, if you are using thinnet with the electrical signal, it is considered a cabling, you know that thinnet is limited to layer-1 device 185 m But what if you want to connect two systems together that are 235 m apart You would place a repeater somewhere before the 185-m mark so that the repeater will regenerate or rebuild, the signal, allowing it to travel the extra difference Figure 3-18 shows a signal that is weakened over distance but is regenerated through the use of a repeater

As usual, if you have access to more than one system, take advantage of it with one exception You may be asking yourself, Hey, how come I m not reinstalling the cards into this disassembled PC I have sitting here That s a very good question! In the next chapter, you ll be practicing removing the motherboard from the case and reinstalling it This process would be complicated by having a card or two sticking out of the motherboard After you complete your practice on the motherboard, you can check back with this chapter and reinstall the expansion cards in the disassembled PC

In this example, we are selecting entries from the Vulnerabilities table that have the ID matching the vuln_id argument An arbitrary number of parameters and values may be specified for any query To prevent SQL injection, always use parameterized queries

FIGURE 3-18

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