See reply inline:
>From: "[EMAIL PROTECTED]"
>Reply-To: "[EMAIL PROTECTED]"
>To: [EMAIL PROTECTED]
>Subject: I am having a mental block [7:7609]
>Date: Thu, 7 Jun 2001 15:52:41 -0400
>
>I keep on seeing these questions in books and practice test that ask me "If
>host A sends a frame to host B what is the source MAC address? What is the
>designation MAC address?
>
>host A -------repeater---------host B (I don't think anything will happen
>to
>the frame's MAC address)
Source MAc would be Host A MAC address. Destination would be HostB.
>
>host A -------bridge------------host B (I don't think anything will happen
>to
>the frame's MAC address)
Same as above.
>
>host A -------router------------host B (MAC address changes. What is the
>source MAC? What is the destination MAC?)
Source MAC would be the router's interface MAC address. for example, Host A
(host A mac is a1a1) is connected to e0 (e0's mac address is aaaa) and Host
B is connected to e1 (e1's mac address is bbbb). The Host B be would see
source mac from host A as aaaa and destination mac address as Host B's mac
address. Of course, this is given that the two interface are routed and not
bridged.
>
>host A -----Ethernet-----router SR/TLB---------token ring---host B (MAC
>address changes. What is the source MAC? What is the destination MAC?)
This would be an eduated guess. Host B would see the Host A mac address as
the source mac but in a non-canonical form. Remember, ethernet is canonical
(least significant)and token-ring is non-canonical (most significant bit).
>
>I am having a mental block
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