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Correct Answers: C A. Incorrect: This solution repairs inconsistencies in the DHCP scope. It does not delete static DNS resource records. B. Incorrect: This solution would work, but it involves excessive administrative effort. C. Correct: Unlike PTR resource records, static A resource records do not age and cannot be removed automatically. The Dnscmd /ageallrecords command causes all records to age, which in effect converts static records into dynamic records. Dnscmd is a Microsoft Windows Server 2003 support tools utility. To run it you need to install Support Tools from the sever CDROM and change to the \program files\support tools directory.

Note that this problem was easy to fix . However, the reverse defining a type derived from a base type that doesn t have the SerializableAttribute attribute applied to it is not easy to fix . But, this is by design; if the base type doesn t allow instances of its type to be serialized, its fields cannot be serialized since a base object is effectively part of the derived object . This is why System.Object has the SerializableAttribute attribute applied to it . Note In general, it is recommended that most types you define be serializable . After all, this

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XPathNavigator provides read-only access to an underlying data store as if it were a hierarchy of nodes, conceptually similar to the Document Object Model. The members of

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grants a lot of flexibility to users of your types . However, you must be aware that serialization reads all of an object s fields regardless of whether the fields are declared as public, protected, internal, or private . You might not want to make a type serializable if it contains sensitive or secure data (like passwords) or if the data would have no meaning or value if transferred . If you find yourself using a type that was not designed for serialization and you do not have the source code of the type to add serialization support, all is not lost . In the Overriding the Assembly and/or Type When Deserializing an Object section later in this chapter, I will explain how you can make any non-serializable type serializable .

Implementing, Managing, and Maintaining Name Resolution (2.0)

When you apply the SerializableAttribute custom attribute to a type, all instance fields (public, private, protected, and so on) are serialized .1 However, a type may define some instance fields that should not be serialized . In general, there are two reasons why you would not want some of a type s instance fields to be serialized:

D. Incorrect: Scavenging removes all stale records from the DNS zone. Static records do not age, and consequently, are never identified as stale. You need to convert all records to dynamic.

XPathNavigator provide the means to navigate through the nodes, obtain information about nodes, and, most important, evaluate XPath expressions against the node set. Navigation through the nodes is via a cursor similar to that provided by XmlReader; the node under the cursor is the current node. Unlike XmlReader, XPathNavigator works against a cached node tree and so supports both backward and forward cursor movements. Using XPath expressions means that sets of nodes meeting specified criteria can be identified and accessed directly.

Correct Answers: C and D A. Incorrect: The Web server has a static IP address. There is no point in trying to renew its DHCP lease. B. Incorrect: You have no reason to believe that the clients are not registered in DNS. No problems have been reported about clients not accessing each other. C. Correct: Windows XP Professional DNS employs negative caching. The Web server has been disconnected for a length of time that is sufficient for its host resource record to have been removed from the DNS zone file. Thus, when the users tried to access the Web server s FQDN by typing in the URL, their client PCs cached that the FQDN could not be resolved. On the other hand, you pinged the Web server s IP address and did not, therefore, request name resolution. When the users tried to access the Web site again, the client PCs used cached information and discovered that the FQDN had been cached as invalid. Clearing the negative result from the clients caches solves the problem. D. Correct: Cache entries, including negative entries (refer to the explanation for answer C), typically time out in 45 minutes or less.

Do not use C# s automatically implemented property feature to define properties inside types marked with the [Serializable] attribute, because the compiler generates the names of the fields and the generated names can be different each time that you recompile your code, preventing instances of your type from being deserializable .

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