3 - OSI PDU

Question 1

What PDU type has layer 7,6,5 have

Application, presentation, session.

Answer 1

PDU is - DATA

Question 2

Transport PDU is -

Answer 2

SEGMENTS -

The Transport layer receives large data streams from the upper layers and breaks these up into smaller pieces called segments

Question 3

Network PDU is -

Answer 3

PACKETS -

Packets are used commonly for ip packets..
This is normally sent when the Data need to leave the LAN and go over WAN connection.
This is called packet switching and is done via a router.
The router uses it routing table to help decide which path to select.

Question 4

Data Link PDU is -

Answer 4

FRAMES -

Handles errors in the physical layer, flow control and frame synchronization.
Frames everything, places everything in correct order - source address, destination address, session etc.

Question 5

Physical PDU is -

Answer 5

BITS -

These are the electrical signals sent over the wire/cables to other devices.