Content: LAN Features & Purposes, Topology, Layered Model of LAN, Media Access Control: CSMA/CD | Ethernet, LAN Devices. References: Data- Computer Communication handbook- William Stallings, TCP/IP Illustrated, Volume I - . Stevens, CCNA- semester1-2-3-4. | Computer Network 40 units 45 minutes unit Part 2 LOCAL AREA NETWORK 1. LAN Features Purposes 2. Topology 3. Layered Model of LAN 4. Media Access Control CSMA CD Ethernet 5. LAN Devices References 1. Data- Computer Communication handbook- William Stallings 2. TCP IP Illustrated Volume I - . Stevens 3. CCNA- semester1-2-3-4 LAN Features Purposes 1. Belongs to own an organization 2. Building and development depending on organization s requirements and budget. 3. No cost to users but being controlled Purposes 1. Sharing resources Hardware CPU RAM Storages primters. Soft ware applications MS-offices antivirus OS Organization s Information - database file server Communication facilities - ADSL Wireless RAS mail. 2. Communication to customers partners staff. 3. E- management Lotus note Business Process Reengineering CRM- Customer Relationship Management 4. Broadcast the image of organization web server Interconnecting large systems Main-frame Storage network - SAN Physical Logical Topologies Physical topologies - Define the actual layout of the wire media Logical topologies - Define how the media is accessed by the hosts The path that the data flow transmitted and received Topology Layer 2 Switch With Hubs Internal Using in ptithcm 1 Physical Topology Bus Single backbone All hosts directly connected to backbone Each end of the bus must be properly terminated Physical Topology Star All devices connected to a central point Center of star is usually a hub or a switch Physical Topology Extended Star Physical Topology Hierarchical Connects individual star topologies together. At the center of the star is a hub or a switch. Extends the length and size of the network. Like the extended star except a computer controls traffic not a hub or a switch . Internal Using in ptithcm 2 Physical Topology Mesh Each host has its own connection to every other host. Used in situations where communication must not be interrupted. Logical Topologies Token Passing Broadcast Logical Topology .
