By Paul Albitz, Cricket Liu
DNS and BIND tells you every thing you want to paintings with one of many Internet's primary development blocks: the dispensed host details database that's liable for translating names into addresses, routing mail to its right vacation spot, or even directory mobilephone numbers with the hot ENUM ordinary. This booklet brings you recent with the most recent alterations during this the most important service.
The 5th variation covers BIND 9.3.2, the latest free up of the BIND nine sequence, in addition to BIND 8.4.7. BIND 9.3.2 includes additional advancements in defense and IPv6 help, and significant new positive aspects reminiscent of internationalized domains, ENUM (electronic numbering), and SPF (the Sender coverage Framework).
Whether you're an administrator concerned with DNS each day or a person who desires to be extra educated in regards to the net and the way it really works, you'll locate that this booklet is vital reading.
* What DNS does, the way it works, and in case you have to use it
* how to define your personal position within the Internet's namespace
* developing identify servers
* utilizing MX files to course mail
* Configuring hosts to take advantage of DNS identify servers
* Subdividing domain names (parenting)
* Securing your identify server: proscribing who can question your server, combating unauthorized region transfers, warding off bogus servers, etc.
* The DNS safeguard Extensions (DNSSEC) and Transaction Signatures (TSIG)
* Mapping one identify to numerous servers for load sharing
* Dynamic updates, asynchronous notification of switch to a sector, and incremental quarter transfers
* Troubleshooting: utilizing nslookup and dig, studying debugging output, universal problems
* DNS programming utilizing the resolver library and Perl's Net:NS module
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Additional info for DNS and BIND (5th Edition)
We'll cover static members in great detail in the next chapter. Things you can mark as static: n Methods n Variables n A class nested within another class, but not within a method (more on this in Chapter 8). indd 59 11/28/05 12:25:17 AM CertPrs8/Java 5 Cert. 0, Java lets you restrict a variable to having one of only a few pre-defined values—in other words, one value from an enumerated list. ) Using enums can help reduce the bugs in your code. For instance, in your coffee shop application you might want to restrict your size selections to BIG, HUGE, and OVERWHELMING.
0, Java lets you restrict a variable to having one of only a few pre-defined values—in other words, one value from an enumerated list. ) Using enums can help reduce the bugs in your code. For instance, in your coffee shop application you might want to restrict your size selections to BIG, HUGE, and OVERWHELMING. If you let an order for a LARGE or a GRANDE slip in, it might cause an error. Enums to the rescue. BIG; It's not required that enum constants be in all caps, but borrowing from the Sun code convention that constants are named in caps, it's a good idea.
BIG); } } Notice how each of the enumerated values, BIG, HUGE, and OVERWHELMING, are instances of type CoffeeSize. They're represented as static and final, which in the Java world, is thought of as a constant. Also notice that each enum value knows its index or position…in other words, the order in which enum values are declared matters. You can think of the CoffeeSize enums as existing in an array of type CoffeeSize, and as you'll see in a later chapter, you can iterate through the values of an enum by invoking the values() method on any enum type.