Gira anropssystem 834 Plus Planlegging, installasjon, igangkjøring ...

Innhold
9. Prinsipper for nettverksteknikk ............................................ 135
9.1 Hva er et nettverk? ............................................................................... 135
9.2 Hva er en sjiktmodell? .......................................................................... 136
9.2.1 ISO/OSI-7-sjiktmodell ........................................................................... 138
9.2.2 TCP/IP-referansemodell........................................................................ 141
9.3 Nettverkstopologi ................................................................................. 142
9.3.1 Bussnettet (Ethernet)............................................................................ 142
9.3.2 Stjernenettet......................................................................................... 143
9.3.3 Ringnettet (token-ring) ......................................................................... 143
9.3.4 Masketopologi...................................................................................... 144
9.3.5 Fordeler og ulemper ved de grunnleggende topologiene .................... 145
9.4 Ledninger ............................................................................................. 146
9.4.1 Overføringshastighet ............................................................................ 146
9.4.2 Overføringsmåter ................................................................................. 146
9.4.3 Overføringsegenskaper ........................................................................ 147
9.4.4 Strukturert kabling................................................................................ 148
9.4.5 Nettverkskabler .................................................................................... 150
9.4.6 Twisted pair-kabler ............................................................................... 150
9.4.7 Kabelplassering .................................................................................... 157
9.5 Forbindelseselementer ......................................................................... 158
9.6 Nettverkskomponenter......................................................................... 159
9.6.1 Aktive nettverkskomponenter .............................................................. 160
9.6.2 Passive nettverkskomponenter ............................................................ 161
9.6.3 Nettverkskomponenter og anropssystemet 834 Plus .......................... 161
9.7 Tilgangsmetoder CSMA/CD ................................................................. 162
9.8 Hva betyr Ethernet?.............................................................................. 163
9.8.1 Ethernet-spesifikasjon .......................................................................... 163
9.8.2 Ethernet med anropssystemet 834 Plus............................................... 163
9.9 Hva er en IP-adresse?........................................................................... 164
9.10 Hva er en MAC-adresse?...................................................................... 164
9.11 Hva er en vertsmaskin? ........................................................................ 165
9.12 Hva er en port?..................................................................................... 165
9.13 Portvideresending (Port Forwarding) ................................................... 166
9.13.1 Portvideresending via ruter .................................................................. 166
9.13.2 Portvideresending for økt sikkerhet...................................................... 166
9.14 Hva er en ramme? ................................................................................ 167
9.15 Hva er en gateway?.............................................................................. 167
9.16 VLAN - Virtual Local Area Network...................................................... 167
9.16.1 Hva brukes virtuelle nett til? ................................................................. 168
9.16.2 Oppbygning av et VLAN....................................................................... 168
9.17 Overføringsprotokoll TCP/IP ................................................................. 169
9.17.1 TCP - Transmission Control Protocol.................................................... 169
9.17.2 IP - Internet Protocol ............................................................................ 170
9.17.3 Fordeler og ulemper ved TPC/IP........................................................... 171
9.18 NAT - Network Address Translation..................................................... 171
9.18.1 SNAT eller NAT .................................................................................... 171
9.18.2 DNAT.................................................................................................... 172
9.18.3 Problemer forbundet med NAT ............................................................ 172
9.18.4 NAT og IPv6 ......................................................................................... 172
9.19 UDP - User Datagram Protocol ............................................................ 173
9.19.1 Funksjonsmåten til UDP....................................................................... 173
9.19.2 Portstruktur........................................................................................... 173
9.20 Bruk av subnett (subnettmaske)........................................................... 174
9.20.1 Hensikten med subnett ........................................................................ 174
6 10.2011 / V 1.0