|
Home > Archive > CCNA > May 2002 > Question
You are viewing an archived Text-only version of the thread.
To view this thread in it's original format and/or if you want to reply to
this thread please [click here]
|
|
| Hacker 2002-05-22, 3:42 am |
| need some clarification regarding the following:
for frames to move around the network, the MAC address of the destination node (either the final destination or the default gateway of the sending node) is required. However, ARP is a internet layer protocol within the TCP/IP framework.
My question is.... when IP passes the datagram to the network access layer of the TCP/IP framework, the datagram being passed contain just the IP address of the source and destination nodes. When is the MAC address of the destination node passed to the network access layer? If possible, could someone outline the process step-by-step? Thanks. | |
|
| when routing between routers, it depend on the network. for point to point, it does not need to resolve ip to link layer address as its default that it must be send to the other end if not to itself.
otherwise, it require arp to map ip to mac address. It would send out request out of all its interface and the corresponding interface on the other end would respond, hey, i have this ip, and here is my mac addy. The sender will now able to send the packet to the next hop device.
this process continues to the end station.
so this process continues in each hop of the route from A to B since routing table only contain destination network and next hop address/interface.
I am sure there is plenty of techincal inaccuracy that others will correct but I am too lazy to make sure its 100 percent accurate atm :P | |
| eligeo2 2002-05-22, 4:58 am |
| The information that you are trying to understand can be found at Todd Lammle's CCNA study guide second edition pages 238 up to 241. If you havent got the book yet I suggest that you should get one however I believe that Lammle isnt the only source for this particular issue. One thing you've only got to remember, "although the hardware source and destination address changed at every interface of the router was sent to and from, the IP source and destination address never changed. PS , the idea is there mikop.
 |
|
|
|
|