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Answers to Task 2 for Scenario 3-1 125
In Router C:
2
Router A discards the Ethernet header and adds an HDLC header. Router B discards the
HDLC header and adds an Ethernet header. Router C discards the Ethernet header and
adds a Token Ring header.
3
Router A places the never-changing HDLC address (Hex 03) into the header. Router B
places Router C's Ethernet MAC address into the destination address field. Router C
places Aramis's Token Ring MAC address into the destination address field.
4
This is all noise if Aramis cannot get a packet back to D'Artagnan. The following routing
tables show the routes needed for both directions; the routes with asterisks signify routes
required for the routes back to D'Artagnan.
In Router A:
In Router B:
In Router C:
Group
Outgoing Interface
Next Router
group-4
Token Ring 0
--
Group
Outgoing Interface
Next Router
group-1*
Ethernet 0
--
group-2
serial 0
--
group-4
serial 0
group-2.local-B
Group
Outgoing Interface
Next Router
group-1*
serial 0
group-2.local-A
group-2*
serial 0
--
group-3
Ethernet 0
--
group-4
Ethernet 0
group-3.local-C
Group
Outgoing Interface
Next Router
group-1*
Ethernet 0
group-3.local-B
group-3*
Ethernet 0
--
group-4
Token ring 0
--
ch03.fm Page 125 Monday, March 20, 2000 4:58 PM