Refer to the exhibit. After HostA pings HostB, which entry will be in the ARP cache of HostA to support this transmission?
A. 
B. 
C. 
D. 
E. 
F. 
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When a host needs to reach a device on another subnet, the ARP cache entry will be that of the Ethernet address of the local router (default gateway) for the physical MAC address. The destination IP address will not change, and will be that of the remote host (HostB).
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no.answer a
see this!!!
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094adb.shtml
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The answer is option – D.
In this case, the arp entry on host A would hold the mac of router interface and the IP address of default gateway (which is the same router interface). I have checked and verified this topology in Packet Tracer as well as in real network.
Well, as per theory this is not right but in real world, it is… Mysterious !!
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that’s true!
arp cache can only see local subnet, not the other subnet. it’s different from the frame that contains the destination ip add and default gateway’s ip address.
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correction, default gateways’s physical address
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@Majid
It is of course right in theory too.
What host A would do is:
– Host A knew that the IP address of host B is not in the same subnet so it would send the ICMP message (or ping) to default gateway which is 192.168.6.1 (fa0/0). However, it needs to know the actually physical address of this IP address to do so.
– To get the MAC address host A will send ARP request (broadcast) with the IP address 192.168.6.1 as destination. F0/0 gets it and send back the MAC address. THIS MAC ADDRESS and the IP address 192.168.6.1 of F0/0 will be recorded in ARP cache of host A for future use.
I think you guys mistaken this ARP cache with the actual ICMP message which have IP header with IP address of host B as destination. The ARP cache only supports host A to get MAC address of Fa0/0 (default gateway), it has nothing to do with the ping message host A sends to host B.
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Wrong table’s heads. In ARP cache result we can see “internet address”, not “interface address”
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Answer is wrong. See:
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094adb.shtml
and note that ARP cache reflects IP of Host B and MAC of router1 interface fa0/0
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so.. what is the Answer?
I think.. maybe.. The answer is A.
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It depends what is the subnet mask of HostA and whether it deffers from the subnet mask of hostB.
@CiscoStudent The link with Proxy ARP you provided is a different case, in it hostA have /16 mask and it thinks that hostB is in the same subnet, but in the question both hosts have /24 mask , so hostA would know that hostB is not in the same subnet and will send packets to Default GW.
So I think correct answer is D.
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this questions is confusing. but host A will send an ARP to all interface on the same subnet and the local interface too, when it get the response from the gateway its will use the forward trafic to Host B. Remember during encapsulation only the mac address will change the ip address of the destination will remain same. in my opinion i think A is correct. because host A use the mac address of local router interface and the ip address of the destination host B
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I am completely agree with you #sniffer
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Yeah, but in this case hostA knows that hostB is in different subnet, therefore will try to reach it via the Default GW, but as it knows only the ip address of the GW from its configuration, hostA will send ARP request for determing GW mac based, therefore it will have mac and ip addresses of the GW, not of hostB.
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I think the corect answer is D not A.
The host send packet to gateway to send packet to host B
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guys just think of when host use the destination ip of 192.168.6.1 router will think that the request if for him. and he will never forward that message to host b. because he think that message is for him. got it?
thats why we use 2 addresses for routing.
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while sending data to hostB, hostA would send the destination IP as the B’s IP only, but for making this decision, A’s MAC table should have a default gateway and this should have the details of routers interface connecting the A’s LAN. hence the answer is “B”, cause this entry in the MAC table will help host-A make this decision.
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Correction- by mistake i said “the answer is “B”. actually it’s “D”. with the logic/explaination given below.
while sending data to hostB, hostA would send the destination IP as the B’s IP only, but for making this decision, A’s MAC table should have a default gateway and this should have the details of routers interface connecting the A’s LAN. hence the answer is “D”, cause this entry in the MAC table will help host-A make this decision.
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http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094adb.shtml
here is the correct answer.i agree with CiscoStudent
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@tani10
That link is for Proxy ARP, this setup doesn’t mention Proxy ARP being utilised, and the subnet on HostA doesnt cover HostB so Proxy ARP is not being used!
The Answer is D.
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If in doubt run a on your PC do a ‘arp -a’ to list all the arp entries, then ping a remote IP address and run ‘arp -a’ again. Your arp cache will have an entry for your default gateway IP & MAC, but will not have an entry for the remote IP.
Answer is D.
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D is the Correct Answer.
I Test This Using Packet Tracer , After Pinging Host B Only 192.168.6.1 address in the ARP Table, No Entry for Host B
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after getting reply from host B you will get only this entry ” 192.168.6.1 – x.x.x.8916″
answer is D , friends 🙂
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