This page was exported from Free Cisco Training & Resources - Certification Exam Preparation [ https://www.ciscobibles.com ] Export date:Fri Mar 29 0:07:37 2024 / +0000 GMT ___________________________________________________ Title: CCNP BSCI Notes - Network Design --------------------------------------------------- Full mesh formula: n(n-1)/2 Example: To create a mesh between 8 nodes, 8 * (8-1) / 2 = 28; 28 links are needed. Design concepts Legacy Hierarchical Design Model           Core - fast L2-switched backbone           Distribution - L3 switches           Access - dense L2 switches This failed to address issues such as redundancy, Internet and remote access, and locating services. Switch block design was introduced to add redundancy; this included redundant core and distribution switches and links per switch block. Enterprise Composite Network Model This new model was developed to address modern design considerations.          Enterprise campus                  Campus backbone (previously the "core")                  Building distribution (previously "distribution")                  Building access (previously "access")                  Management                  Server farm (for internal enterprise services)          Enterprise edge                  E-commerce                  Internet connectivity                  Remote access                  WAN (internal links)          Service provider edge                  ISP                  PSTN                  Frame relay, ATM, PPP for private connectivity Intelligent Information Network (IIN)          Phase 1: Integrated transport - the shift toward the ECN model          Phase 2: Integrated services - service virtualization (disassociation of services from individual machines)          Phase 3: Integrated applications - recognizing and combining high-layer traffic properties (for example, Network Access Control) Services-Oriented Network Architecture (SONA) SONA is the application of IIN ideas to enterprise networks.          Network infrastructure (IIN phase 1)          Interactive services (IIN phase 2)          Application (IIN phase 3) Routing protocols          Distance vector - a router will only exchange routes with a directly connected neighbor          Link-state - a router advertises a list of all its neighbors and its neighbors' networks; routers run SPF to determine the best path --------------------------------------------------- Images: --------------------------------------------------- --------------------------------------------------- Post date: 2009-11-12 15:03:18 Post date GMT: 2009-11-12 07:03:18 Post modified date: 2010-07-24 14:25:05 Post modified date GMT: 2010-07-24 06:25:05 ____________________________________________________________________________________________ Export of Post and Page as text file has been powered by [ Universal Post Manager ] plugin from www.gconverters.com