Question

The data field consists of: 20 Byte IP-Header | 20 Byte TCP-Header | 1000 Byte Transport data. At which places of the frame and with how many Byte one can find: Layer2-PDU, Layer3-PDU, Layer4-PDU, Layer3-SDU, Layer2-PCI?

Answer 1

Layer2-PDU is found in the datalink layer of the frame and has 40 bytes

Layer3-PDU is found in the network layer which is the packet and has 20 bytes

Layer4-PDU is found in the transport layer , the segment and has 1000 bytes

Layer3-SDU is found in the IP header 20 bytes

Layer2-PCI is found in the TCP-Header and 20 bytes