De onderste lagen van het OSI model Hogeschool Utrecht 5-4-2017 1CSNW1 – week 5 De onderste lagen van het OSI model 1CSNW1 - Computersystemen en Netwerken

OSI Reference Model (herh.) Hogeschool Utrecht 5-4-2017 OSI Reference Model (herh.) All People Seem To Need Data Processing Bron: DevCentral 1CSNW1 - Computersystemen en Netwerken

Thick Ethernet (10BASE5) (physical layer) 50 Ohm 10 Mbit/sec (baseband)

Vampier tap

Thin Ethernet (10BASE2) (physical layer)

UTP Ethernet 10BASE-T (physical layer) hub = naaf

Netwerkkaart (Thin Ethernet en UTP) Bron: Wikipedia

Carrier Sense Multiple Access CSMA/CD (1) Carrier Sense Multiple Access CSMA/CD (ANSI/IEEE 802.3)

CSMA/CD (2) Collision Detection

Manchester Encoding

Start Frame Delimiter; DeSTination; SouRCe; Length/Type; Ethernetpakket octet = byte Start Frame Delimiter; DeSTination; SouRCe; Length/Type;

Media Access Control (MAC) address MAC48 (6 octetten) 248 = 281.474.976.710.656 mogelijke MAC adressen Voorbeeld: 00:C0:0C:03:A3:44 FF:FF:FF:FF:FF:FF als bestemming dan broadcast

Ethernet kabellengte (1) - 10 Mb/sec => 100 nsec per bitcel - Snelheid in coax is 2/3 x lichtsnelheid => 2/3 (3.108) = 2.108 m/s - In 100 nsec 20 meter; ergo één bit is 20 meter lang

Ethernet kabellengte (2) - Eén segment max. 500 m en max. 5 segmenten - Max. 100 transceiver per segment met minimaal 2,5 m afstand - Dus (5 x 500) / 20 = 125 bits over de totale lengte van de kabel

Ethernet Standards The 10BASE system operates at 10 Mbps and uses baseband transmission methods 100BASE 100 Mbps. Because it is 10 times faster than Ethernet, it is often referred to as Fast Ethernet. 100BASE-TX: two pairs of high-quality twisted-pair wires 100BASE-T4: four pairs of normal-quality twisted-pair wires 100BASE-FX: fiber optic cable 1000BASE Gigabit ethernet 1000BASE-T: category 5e copper cabling 1000BASE-SX: fiber optic cable 1000BASE-LX: longer distances over single-mode fiber 10GBASE (emerging technology)

Netwerkkoppeling (herh.) Application Application Transport Transport Network Network Network Network Data Link Data Link Data Link Data Link Physical Physical Physical Physical Radio UTP Bron: Jochen Schiller

Netwerk met VLANs Bron: CISCO

VLAN configuratie

Twee switches dmv trunk verbonden

802.1Q Frame Format (VLAN tagging)

Netwerk met Layer-3 Switch

Practicum Ethereal (Wireshark)

Bronnen Ethernet (Wikipedia) IEEE Standards Association CISCO Systems, Inc. Wireshark site Jochen Schiller, “Mobiele Communicatie”, (Pearson

Opdrachten Bestudeer hfdst. 15.3 Maak opgaven 15.5 en 15.6 Hogeschool Utrecht 5-4-2017 Opdrachten Bestudeer hfdst. 15.3 Maak opgaven 15.5 en 15.6 1CSNW1 - Computersystemen en Netwerken