Protocol Data Units Flashcards
1
Q
What is a PDU?
A
PDU = Protocol Data Unit.
This is a unit of information that is sent by a protocol at an OSI layer.
For example, a switch is operating on an Ethernet PDU.
Another example, TCP or UDP PDU = TCP segment or UDP datagram.
2
Q
What is MTU?
A
MTU = Maximum Transmission Unit.
The maximum size of an IP packet to send across a network without requiring fragmentation.
3
Q
What is the downside of fragmentation?
A
Fragmentation slows things down. Losing a fragment can also lose an entire packet.
