At Each Router

IP

Software

Subnet

Process

SnPDU for

Subnet A

SnA

SnB

IP PDU

Router

Subnet A

Subnet B

2. Subnet process removes IP PDU from SnPDU, delivers it to the IP process.

1. Router subnet process accepts the SnPDU

3. IP process

considers

best route

IP PDU

SnPDU on

Subnet B

4. IP process delivers the IP PDU to the subnet process

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