tailieunhanh - Windows Internals covering windows server 2008 and windows vista- P20

Windows Internals covering windows server 2008 and windows vista- P20: In this chapter, we’ll introduce the key Microsoft Windows operating system concepts and terms we’ll be using throughout this book, such as the Windows API, processes, threads, virtual memory, kernel mode and user mode, objects, handles, security, and the registry. | Authority For secure clients which have their name records signed by a certifying authority the authority is identified by an SHA-1 hash of an associated public key while for unsecured clients it is zero. If a client is secure PNRP validates the name record before publishing it. Classifier The classifier uses a simple string to identify a service provided by a peer which allows multiple services to be provided by the same device. To create a PNRP ID PNRP hashes the P2P ID and combines it with a unique 128-bit ID called the service location as shown in Figure 12-21. The service location identifies different instances of the same P2P ID in the same cloud. PNRP uses two clouds a global cloud which corresponds to all IPv6 addresses on the Internet and the link-local cloud which corresponds to IPv6 addresses within a single subnet. Public key Hash Friendly name authority classifier P2P ID Hash 128 bits Senrice 128 bits PNRP ID FIGURE 12-21 PNRP IDyeneration PNRP Resolution and Publication PNRP name resolution occurs in two phases Endpoint determination In this phase the requesting peer determines the IPv6 address associated with the peer responsible for publishing the PNRP ID of the desired service. PNRP ID resolution In this phase once the requesting peer has located and confirmed the availability of the peer associated with the IPv6 address it sends a PNRP request message for the PNRP ID of the service being requested. The peer providing the service replies to confirm the PNRP ID and can supply a comment and up to 4 KB of additional data such as context information related to the service. During the first phase PNRP iterates over nodes while locating the publishing node such that the node performing name resolution will be responsible for contacting nodes that are successively closer to the desired PNRP ID. Each iteration works as follows Once a peer receives a request message it performs a lookup in its cache for the requested PNRP ID. If a match is found

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