Common networking concepts

Protocol data unit (PDU) and Service data unit (SDU):
At any particular layer N of OSI model, a PDU is a complete message that implements the protocol at that layer. When this “layer N PDU” is passed down to layer N-1, it becomes the data that the layer N-1 protocol is supposed to service. Thus, the layer N protocol data unit (PDU) is called the layer N-1 service data unit (SDU).

AD (Administrative distance):

 Directly connected  0
Static route 1
Summary EIGRP 5
OSPF 110
RIP 120
External EIGRP 170
IBGP 200

Multihome: When your network have more then one ISP connection then it is called as multihome.

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