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All documented procedures must be tested. In an emergency, it is likely that written procedures will be followed blindly. If they don t work exactly right, the result may well be chaos. The only thing worse than no documentation is bad documentation. Since it is virtually impossible to target documentation at inexperienced personnel, the target audience should be experienced system administrators who are not familiar with the particular idiosyncrasies of your local systems and environment. When testing your standards implementation, make sure that systems and applications meet the documented local standards. Know what all test results should be before the test is run. Test your backups by restoring a couple of them on a regular basis. If you cannot restore your backups in a test environment, you won t be able to restore them when a disaster occurs. Test any critical process whose failure may cause downtime. Consider less obvious potential SPOFs, like building access scanners or locked doors.

Figure 58-1: PPP data frame format The PPP frame contains the following fields:

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machine of any Web user who hit its Web page. The applet would spin a thread on the remote machine to run part of a factoring solution on that machine's CPU. After a sufficient amount of work, a partial solution could be mailed back to a collection site for collation with similar results from elsewhere. There is no reason a CPU-cycle-stealing applet needs to work on factoring. It can perform any work. Using such an applet, a Web miscreant could instantly upgrade his or her 486-DX2/66 into a huge collective machine with the combined power of hundreds of workstations. Workstations around the world could be automatically pressed into service. Imagine the dismay of a CEO who discovers that her new Whiz-bang 4200+ has been helping compute results for a competitor. Or imagine the legal ramifications in store for the owner of a government machine that inadvertently helps a foreign national break an encryption algorithm. Or imagine a computer hardware manufacturer who specs out a competitor's machine using a stealthy benchmark applet. The possibilities are many.

Besides periodic procedural testing, it is also important to test applications and how they perform in high-stress situations. Always remember that long service times and failures are indistinguishable to the average user. How does your system perform as load averages increase, especially when they do so over long periods of time What breaks first Fix those things, and move on to second- and third-level failures. Bad assumptions made in buffer or counter sizes will often be the first things exposed. Test the sort of problem that may not bite you for a while. The Y2K problem is an excellent example of this. Programs that were written in the 1970s that

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Flag field Every PPP frame begins and ends with a 1 byte flag field with a value of 01111110 Address field The only possible value for this field is 11111111 Control Field The only possible value of this field is 00000011 Because both the address and control fields can currently take only a fixed value, one wonders why the fields are even defined in the firstplace The PPP specification [RFC 1622] states that other values "may be defined at a later time," although none have been defined to date Because these fields take fixed values, PPP allows the sender to simply not send the address and control bytes, thus saving two bytes of overhead in the PPP frame Protocol The protocol field tells the PPP receiver the upper layer protocol to which the received encapsulated data (ie, the contents of the PPP frame's info field) belongs On receipt of a PPP frame, the PPP receiver will check the frame for correctness and then pass the encapsulated data on to the appropriate protocol [RFC 1700] defines the 16-bit protocol codes used by PPP Of interest to us are the IP protocol (ie, the data encapsulated in the PPP frame is an IP datagram) which has a value of 21 hexadecimal, other network layer protocols such as Appletalk (29) and DECnet (27), the PPP link control protocol (c021 hexadecimal) that we discuss in detail in the following section, and the IP Control Protocol (8021) which is called by PPP when a link is first activated in order to configure the IP-level connection between the two routers on each end of the link (see below) Information This field contains the encapsulate packet (data) that is being sent by an upper layer protocol (eg, IP) over the PPP link The default maximum length of the information field is 1500 bytes, although this can be changed when the link is first configured, as discussed below Checksum The checksum field is used to detect bit errors in a transmitted frame It uses either a two or four byte HDLC-standard cyclic redundancy code.

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... Preface -- 1 -- 2 -- 3 -- 4 -- 5 -- 6 -- 7 -- 8 -- 9 -- A -- B -- C -- Refs Front -- Contents -- Help

Before closing our discussion of PPP framing, let us consider a problem that arises when any protocol

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