1CSNW1

1CSNW1 – week 5

OSI Reference Model (herh.) All People Seem To Need Data Processing

Bron: DevCentral

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

CSMA/CD (1) Carrier Sense Multiple Access

CSMA/CD (ANSI/IEEE 802.3)

CSMA/CD (2) Collision Detection

Manchester Encoding

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.   



1000BASE Gigabit 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-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

Data Link Physical

Radio

Network

Network

Data Link

Data Link

Data Link

Physical

Physical

Physical

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