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Home > Archive > CCNA > November 2000 > Confusing Wording
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| What is this asking for?
Which protocol resolves an IP address to a Mac address?
this question sounds as if the IP is unknown, and the Mac is known.
but its the other way around right? | |
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| Arp resolves mac addresses from IP addresses.
RARP resolves ip addresses from mac addresses.
=)
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B.S. in Telecommunications Management, Network+, CCNA - Still can't type, still no job! | |
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| quote:
Originally posted by rore2246:
Arp resolves mac addresses from IP addresses.
RARP resolves ip addresses from mac addresses.
Thanks, but,
In arp, you know the IP? or do you know the MAC?
In RARP, you know Mac? or do you know the IP?
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| quote:
Originally posted by adilux:
What is this asking for?
Which protocol resolves an IP address to a Mac address?
this question sounds as if the IP is unknown, and the Mac is known.
but its the other way around right?
no ..it is'nt.
ARP resolves IP to MAC address.and RARP does opposite.
in ARP you know MAC
in RARP you know IP !!!
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| quote:
in ARP you know MAC
in RARP you know IP !!!
Hey, please don't confuse people about the concept..
You use ARP to resolve IP to MAC address..
That means you know the IP FIRST, and THEN MAC.
RARP is you know the MAC address FIRST and THEN use RARP to resolve the IP address. | |
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| quote:
Originally posted by jasonyip:
[BThat means you know the IP FIRST, and THEN MAC.
RARP is you know the MAC address FIRST and THEN use RARP to resolve the IP address.[/B]
That was what i first thought, then i came across some very bad english, that threw me off,
ARP knows IP, to find MAC
RARP knows MAC to find IP
would that mean RARP the same thing as Inverse Arp ?
[This message has been edited by adilux (edited 11-28-2000).] | |
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| quote:
would that mean RARP the same thing as Inverse Arp ?
An Inverse ARP is used by a router which is setup up for Frame Relay. The Frame Relay router will send out an Inverse ARP to every DLCI it knows of. In the Inverse ARP, is the source router's IP address, and a request for the IP address of the remote router. This is done so routers can map the DLCI's to the IP address of other routers in the Frame Relay network.
A RARP,on the other hand, is used when a source (a computer on a LAN for example), wants to know it's own IP address. Once a RARP is sent, only a device set up to reply to a RARP (router, server, etc.) will respond.
Hope this helps.
[This message has been edited by firechicken (edited 11-28-2000).] | |
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| A good way to think of the question, "Which protocol resolves an IP address to a Mac address?" is to say "Have IP address need MAC address."
I used to get confused with the "resolves" stuff until I realized this.
Cheers,
Deets | |
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| I think the important concept here is that you must have ONE IP address (layer 3) associated with ONE MAC address (layer 2)to have the network functioning .
Wether you know the IP or the MAC first is just the way to resolve this issue .
A good way to remember that is ,
with ARP ,without I (inverse) and R (reverse)
you know the IP address .
In the other way you know the layer 2 address.
Hope this helped.
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