1CSNW1 – week 5

OSI Reference Model (herh.)

All

People

Seem

To

Need

Data

Processing

Bron: DevCentral

10 Mbit/sec (baseband)

50 Ohm

Thick Ethernet (10BASE5)(physical layer)

Vampier tap

Thin Ethernet (10BASE2) (physical layer)

hub = naaf

UTP Ethernet 10BASE-T(physical layer)

Netwerkkaart (Thin Ethernet en UTP)

Bron: Wikipedia

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;

octet = byte

Ethernetpakket

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

- 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 (1)

- 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 kabellengte (2)

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

Transport

Network

Data Link

Physical

UTP

Data Link

Physical

Application

Transport

Network

Data Link

Physical

Data Link

Physical

Network Network

Radio

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