Ethernet SNMP Module Installation and Reference Guide ( J2603B) 1995-10

In the illustration below, Server 104 is transmitting a packet destined for PC
101. (For illustration purposes, the numbers 101, 102, 103, and 104 are used
to represent 12-digit hexadecimal station addresses.) The ports for PC 101
and PC 102 have Eavesdrop Prevention enabled or configured ON. Because
PC 101’s station address matches the packet destination address, it receives
the packet unaltered. However, PC 102’s station address does not match the
packet destination address and therefore it receives a useless packet (the
packet data field contains a meaningless pattern of alternating 1’s and 0’s.)
The port for PC 103 does not have Eavesdrop Prevention enabled and
therefore PC 103 receives the packet unaltered from Server 104.
HP AdvanceStack 10Base-T Hub-24
Server 104
Data 104:101
PC 103
Eavesdrop
Prevention
OFF
PC 102
Eavesdrop
Prevention
ON
PC 101
Eavesdrop
Prevention
ON
Data 104:101
useless
packet
Data 104:101
Security Information
Security Information
C-7