OSI-7-Schichtenmodell V2
Bitübertragungs-
schicht
Sicherungs-
schicht
Vermittlungs-
schicht
Transport-
schicht
Sitzungs-
schicht
Darstellungs-
schicht
Anwendungs-
schicht
Physical
Layer
Data-Link
Layer
Network
Layer
Transport
Layer
Session
Presentation
Application
Layer
Layer
Layer
1
2
3
7
6
5
4
Protokoll / Standard
Einheit
Daten
Segment
Packet
Frame
Bit
MQTT
TLS
TCP
IP
Ethernet
IEEE 802.3
1000Base-T
Leitungseigenschaften:
Schirm, Adernanzahl, TP, ACR
Codierung:
5-PAM, 4B5B
Spannung:
+ 1V bis - 1V
Schrittgeschwindigkeit:
125 Mbaud
Media-Acess-Control:
CSMA/CD
Logical Link Control:
Frame Check Sequenz
Options:
VLAN-Tag
Topic, Payload
ASCII
TLS-Handshake
Session Key
Ver- / Entschlüsselung
Quality of
Christian Rau
Kategorie:
Cat 6, Cat 7
FCS
4 Byte
Preambel
8 Byte
SFD
Destination-Address
Source-Addresse
Type
6 Byte
6 Byte
2 Byte
Version
4 Bit
ECN
Total Length
Identification
Header Checksum
16 Bit
8 Bit
16 Bit
IHL
DSCP
3
16 Bit
Flags
Fragment Offset
8 Bit
TTL
Protocol
Destination-IP-Address
Source-IP-Addresse
32 Bit
32 Bit
13 Bit
Source-Port
16 Bit
Destination-Port
Sequenznumber
32 Bit
32 Bit
16 Bit
Acknowledgement-Number
Data-
Checksum
6 Bit
16 Bit
Offset
Res.
Flags
6 Bit
4 Bit
16 Bit
Window-Size
Urgent-Pointer
16 Bit
4 Bit
5 Bit
3
Flags
8 Bit
Msg.
Length
Topic Length
Topic
Payload
8 Bit
2 Byte
9 Byte
2 Byte
4 Bit Message-Type
1 Bit DUP Flag
2 Bit QoS Level
1 Bit Retain
Publish Msg.: /sfm/data +0
Service
Packet > MTU Fragmentierung
Subnetmask, Gateway, Routing
Handshake, End to End Ack.
b8 27 eb ec 78 c9 e0 dc a0 53 4e 71 08 00 45 00 00 37 10 30 00 00 1e 06 3f f8 0a 28 05 03 0a 14 33 5b c0 06 07 5b 00 03 0e 0a fe 4d a2 a6 50 18 20 00 e4 c5 00 00 30 0d 00 09 2f 73 66 6d 2f 64 61 74 61 2b 30
ARP
Daten > MSS Segmentierung
1 Bit Push
1 Bit Reset
1 Bit Syn
1 Bit Fin
1 Bit Urgent
1 Bit Ack.
1 Bit Reserved
1 Bit don't fragment
1 Bit more fragments