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Name resolution is what DNS is all about Any DNS client (workstation, router, server, or even another DNS host) can query a DNS host for the following three types information RECURSIVE QUERIES The most common type of query is called a recursive query This is sent from a DNS client to the DNS host lookup, requesting that the DNS host translate a host name (hostnamesubdomaindomain) to an IP address From the command line of a router, a recursive query is initiated when attempting to open up a Telnet connection to another host Assuming that at least one DNS host has been entered into the router's configuration using the IP | name-server command, you can enter a valid host name at the prompt, or directly after a connect or telnet command, to execute a successful recursive query ITERATIVE QUERIES Typically sent between DNS hosts, an iterative query is used when one DNS host is unable to service a DNS client request The DNS host will send an iterative query to other DNS hosts in an attempt to find a host that can service the DNS client's request INVERSE QUERIES An inverse query, or reverse lookup, occurs when a DNS client asks the DNS host to resolve an IP address to a host name As the name implies, this query is the opposite of a recursive query

Now that you ve seen all the pieces used to send and receive frames, let s put these pieces together and see how a frame gets from one system to another The basic send/ receive process is as follows First, the sending system network operating system (NOS) software such as Windows Vista hands some data to its NIC The NIC begins building a frame to transport that data to the receiving NIC (Figure 2-20)

Now we check how this transformation maps the point z = 0 at the center of the disk We nd Tz(0) = 1 0 = +1 0 +1

Several DNS record types are used frequently by every DNS server Together, they allow the DNS host to store and retrieve host and address information quickly and efficiently See Table 11-1 Table 11-1: DNS Record Types

In the background, several items take place (all before the secure Web page loads) First, the Web server automatically sends down a copy of its certificate Built into that certificate is the Web server s digital signature and a signature from the third party who guarantees this is really eBay Go to your national version of eBay (I m in the United States, so I ll use eBaycom) and click Sign In (you don t even need an eBay account to do this) Now look at the certificate for the current session Depending on the Web browser you use, there are different ways to see it Try clicking the little lock icon at the bottom of the page or in the address bar as this usually works Figure 11-14 shows the certificate for this session

This is a point in the right half plane So the transformation does not map to the upper half plane We can make it do so with another rotation, given by ei /2 = i Hence, the transformation that will map the unit circle to the upper half plane is Tz = i 1 z z +1