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Correct Answers: A A. Correct: Stale resource records are being accessed. When a record s TTL has expired, it will not be used. In this scenario, the subsequent increase in name res olution traffic that results from a smaller TTL is acceptable if fewer stale records are accessed. B. Incorrect: The problem is that stale records are not timing out quickly enough in cache, not that stale records with zero TTL are failing to be removed from the zone. Although selecting this check box is probably a good idea in this scenario, this solution will not solve the immediate problem. C. Incorrect: You can set the default TTL for a zone, or you can set the TTL for indi vidual records. You cannot set it at server level. There is no SOA tab in the server properties dialog box. D. Incorrect: This answer is incorrect for the reason stated in the explanation for answer B.

Correct Answers: C and D A. Incorrect: Recursion can be disabled on DNS servers that do not respond directly to clients, but receive name resolution requests from other DNS servers. Forwarders are disabled automatically if recursion is disabled. Consequently, if such a DNS server receives a name resolution request that it cannot satisfy from the zones for which it is authoritative, it returns a negative result. If all of Contoso s

This method enumerates over the arrays, initializing each field to its corresponding value . At this point, the object has been completely deserialized .

Objective 2.2: Manage DNS 14-27

Node Set, an unordered collection of nodes XPathNodeIterator class encapsulates a node set. boolean, true or false number, a floating-point number string, a sequence of UCS characters

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As discussed earlier in this chapter, the best way to get control over the serialization and deserialization process is to use the OnSerializing, OnSerialized, OnDeserializing, OnDeserialized, NonSerialized, and OptionalField attributes . However, there are some very rare scenarios where these attributes do not give you all the control you need . In addition, the formatters use reflection internally and reflection is slow, which increases the time it takes to serialize and deserialize objects . To get complete control over what data is serialized/deserialized or to eliminate the use of reflection, your type can implement the System.Runtime.Serialization.ISerializable interface, which is defined as follows:

DNS servers had recursion disabled, no resolution of external names would be possible. This setup would certainly be secure, but it is not a good plan for a sup plier of military equipment. B. Incorrect: Round robin is a load-balancing mechanism that allows the same FQDN to be allocated to several hosts, each with a different IP, and balances access requests between these hosts. It has no effect on network security. C. Correct: Redirection is when an attacker is able to redirect queries for DNS names to servers under the control of the attacker. One method of redirection is to pollute a DNS server cache with erroneous data. For example, if a query from Contoso requires resolution of the FQDN www.fabrikam.com, and a referral answer provides a resolution for fabrikam.com, the DNS server continues to use the cached data from crooks_r_us.com to resolve further queries for www.fab rikam.com. If all server caches are secured against pollution, such referrals are rejected. In Windows Server 2003 DNS, caches are secured against pollution by default, but in a high security environment, you should check that this setting has not been altered. D. Correct: Redirection can be accomplished whenever an attacker has writable access to DNS data. Insecure dynamic updates allow computers that do not have computer accounts in Active Directory to register information in DNS.

public interface ISerializable { void GetObjectData(SerializationInfo info, StreamingContext context); }