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ARP, RARP, DCAP protocol
16 years 4 months ago #27059
by GUNASEKAR
ARP, RARP, DCAP protocol was created by GUNASEKAR
what is the function of ARP,RARP,DCAP protocol in datalink layer.
As per my knowledge,ARP protocol have the MAC address of the network system.
If I am not correct, kindly explain me about it?
As per my knowledge,ARP protocol have the MAC address of the network system.
If I am not correct, kindly explain me about it?
16 years 4 months ago #27060
by S0lo
Studying CCNP...
Ammar Muqaddas
Forum Moderator
www.firewall.cx
Replied by S0lo on topic Re: ARP, RARP, DCAP protocol
ARP (Address Resolution Protocol):
Finds the data link layer address (the MAC address) for a known IP address that is on the same subnetwork. Say your host is connected to a switch, and you want to ping (or connect) to an other host on the same switch (on the same sub-network). Your host will send a broadcast ARP request saying "Hey guys, What is the MAC address of this IP?". All your hosts/devices on the switch will hear this request but only the host that you wanted to connect to will reply (unicast) saying "I have this IP, this is my MAC". Your host can now start sending packets/frames using this MAC address as the destination in all frames it sends. This way the switch knows were to send the frame (because the switch has a map: MAC-to-port).
Note that your host will cache this MAC for some time, for usage in the next few minutes. So we don't need to broadcast a question every time we want to send to the same host. By the way ARP is not strictly a datalink layer protocol, it's defined in both the datalink and network/internet layers (2 and 3).
More: en.wikipedia.org/wiki/Address_Resolution_Protocol
RARP (Reverse Address Resolution Protocol):
Almost the opposite of ARP. Finds the IP address of a host with a known MAC address. As far as I know, it was used in the past when MAC addresses used to be configured on a central server. BOOTP and DHCP made this obsolete.
More: en.wikipedia.org/wiki/Reverse_Address_Resolution_Protocol
DCAP: Data Link Switching Client Access Protocol
I have no idea!!, look here: www.javvin.com/protocolDCAP.html
Finds the data link layer address (the MAC address) for a known IP address that is on the same subnetwork. Say your host is connected to a switch, and you want to ping (or connect) to an other host on the same switch (on the same sub-network). Your host will send a broadcast ARP request saying "Hey guys, What is the MAC address of this IP?". All your hosts/devices on the switch will hear this request but only the host that you wanted to connect to will reply (unicast) saying "I have this IP, this is my MAC". Your host can now start sending packets/frames using this MAC address as the destination in all frames it sends. This way the switch knows were to send the frame (because the switch has a map: MAC-to-port).
Note that your host will cache this MAC for some time, for usage in the next few minutes. So we don't need to broadcast a question every time we want to send to the same host. By the way ARP is not strictly a datalink layer protocol, it's defined in both the datalink and network/internet layers (2 and 3).
More: en.wikipedia.org/wiki/Address_Resolution_Protocol
RARP (Reverse Address Resolution Protocol):
Almost the opposite of ARP. Finds the IP address of a host with a known MAC address. As far as I know, it was used in the past when MAC addresses used to be configured on a central server. BOOTP and DHCP made this obsolete.
More: en.wikipedia.org/wiki/Reverse_Address_Resolution_Protocol
DCAP: Data Link Switching Client Access Protocol
I have no idea!!, look here: www.javvin.com/protocolDCAP.html
Studying CCNP...
Ammar Muqaddas
Forum Moderator
www.firewall.cx
16 years 4 months ago #27061
by GUNASEKAR
Replied by GUNASEKAR on topic Re: ARP, RARP, DCAP protocol
Thanks for the info SOLO
16 years 4 months ago #27062
by S0lo
Studying CCNP...
Ammar Muqaddas
Forum Moderator
www.firewall.cx
Replied by S0lo on topic Re: ARP, RARP, DCAP protocol
Your welcome, any time.
Studying CCNP...
Ammar Muqaddas
Forum Moderator
www.firewall.cx
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