spoofed source ip address and its interface

From: forwardtruth@yahoo.com
Date: Fri Feb 03 2006 - 02:35:39 GMT-3


In IEWB-RS version 1 Lab4 Solution guide says:

"A packet with a source IP address of 141.X.37.100 is received inbound on R4
interface E0/1".

How did he decide on E0/1 because we have more than one interfaces on R4 :
E0/0, E0/1, S0/0, BRI0/0



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