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Home > Archive > alt.certification.network-plus > February 2003 > ARP - A what does it mean?????
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ARP - A what does it mean?????
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| Rachael Martin 2003-02-08, 10:23 pm |
| I am trying to figure out what exactly this command determines. I have heard
if after running the command you get "no arp entries found" that your NIC is
bad, but I do not trust that advice. If my machine has never connected to
the internet or to any internal network equipment, wouldn't i get the same
response?
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| JasonW 2003-02-09, 12:24 am |
| ARP is Address Resolution Protocol. When a computer wants to send a packet
to another computer, it needs both the IP address and the MAC address of the
remote computer. If it has never communicated with the remote computer
before, it doesn't know what its MAC address is, so it sends out a broadcast
containing the IP address in a special packet to see if it can get a reply
from the remote computer. If the remote computer is on the same subnet and
is working correctly, the first computer should get a reply containing the
MAC address that was needed. Then the first computer can directly
communicate with the other computer. The first computer then stores the MAC
address in the ARP table so tht it doesn't have to send out a broadcast next
time, it can just check its table and send the packet.
-JasonW
"Rachael Martin" <supaduck@comcast.net> wrote in message
news:dr2cnR3AessgSdijXTWcpw@co
mcast.com...
> I am trying to figure out what exactly this command determines. I have
heard
> if after running the command you get "no arp entries found" that your NIC
is
> bad, but I do not trust that advice. If my machine has never connected to
> the internet or to any internal network equipment, wouldn't i get the same
> response?
>
>
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