2009年版三级网络技术复习提纲—第八章 网络技术展望（2009 edition of three level network technology review outline - eighth chapter network technology outlook）.docVIP

2009年版三级网络技术复习提纲—第八章 网络技术展望（2009 edition of three level network technology review outline - eighth chapter network technology outlook） The eighth chapter forecast network technology Analysis: this part mainly discusses the prospect of network technology. There are 3 multiple-choice and fill about 5-7 1-2. Pay attention to the basic concept: 1, IP multicast technology: allow one or more of a sender sends a single packet to the network transmission mode of a plurality of recipients, regardless of how many members of the group, the data source only once, by addressing the multicast address, the only need to host and network. (1) features: group address, multicast address multicast network has only; dynamic group; low layer hardware support; (2): D technology based IP, four to 1110, behind the 28 for the multicast address; (2) protocols: IP multicast group management protocol (IGMP), IP (intra domain multicast routing protocol (dense mode, sparse mode) or inter domain multicast routing protocol). 2, P2P (Peer to Peer) network: through direct exchange to share resources and services, a non centralized, equal status of each node, a server and a client; (1): P2P network centralized topology, represented by Napster, a central server, only the index information, including server peer entities; P2P network distributed unstructured topology, represented by Gnutella, no central server, is a peer, poor scalability; P2P network distributed structured topology, represented by Pastry, based on distributed hash table (DHT) distributed discovery and routing algorithm; P2P network hybrid structure: Skype, Kazaa, eDonkey, BitTorent, PPlive as the representative; (2): the application of distributed scientific computing; file sharing; CSCW; distributed search engine; streaming media (PPlive, PPStream). 3, instant messaging (IM) system: real-time information and user interaction status tracking (1) additional features: audio and video chat, application sharing, file transfer, file sharing