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200-125 question 18 discussion

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Refer to the exhibit.

After HostA pings HostB, which entry will be in the ARP cache of HostA to support this

  • A Exhibit A
  • B Exhibit B
  • C Exhibit C
  • D Exhibit D
  • E Exhibit E
  • F Exhibit F
  • Jul 27, 2018, 02:17 AM

Yep, tested in Packet Tracer as well and asnwer D in the correct answer

  • Jul 16, 2018, 05:00 AM

Yes i did that too with same results. How is the answer not D?

  • Jun 19, 2018, 11:24 AM

ARP only works within a subnet, for anything outside of the NIC defined subnet, the packet is simply sent to the default gateway. There would be no new ARP entry for this ping unless the PC ARP cache had forgotten the default gateway. Only viable answer is D

  • May 28, 2018, 05:49 PM

D is correct Answere.

  • May 16, 2018, 12:51 PM

Answer is A. Host do not use the MAC address of another host in different network. They use ARP request to get the MAC address but because the destination host is in another network, the MAC address of the router interface connecting the source host will be used as the source MAC address. use "show arp" command on router or "arp -a" on the source host and you will see that. Hope this helps

  • Apr 5, 2018, 08:13 PM

Your wrong. it will have just default gateway IP and mac, also any other host on is LAN that it has communicated with in recently. I will never have the IP of a host that is out side it LAN.

  • Apr 5, 2018, 08:08 PM

I disagree the Correct answer should be D, it says what would be in the ARP table of host A. there is no way the ARP table of a host would show an IP address that is outside its LAN subnet.

  • Apr 4, 2018, 05:20 AM


  • Apr 4, 2018, 05:19 AM


  • Mar 29, 2018, 07:07 PM

Answer : D protocole arp L2

  • Mar 25, 2018, 02:16 PM

Right answer is D.

  • Mar 15, 2018, 12:59 PM

the question is about arp entry. Not about the information in the packet and frame headers. The arp is used by the pc to reach its LAN peers. In this instance your PC wants to reach the default gateway to send the frame in order for the default gateway to forward the frame towards the destination. The correct answer is D

  • Nov 19, 2017, 08:01 PM

you are not wrong but it is not the right answer. Exhibit D entry will be there in the arp table because it is the default gateway of host A but when host A pings host B a new arp entry will be created as the destination mac address as router 1's physical address as the packet has to go through its gateway but the ip address will be destination IP address i.e. of Host B

  • Nov 1, 2017, 07:56 PM

So, wouldn't the source and destination MAC address get changed back during the decapsulation process?

  • Sep 23, 2017, 04:28 AM

I agree on letter A

  • Sep 19, 2017, 07:44 AM

Wireless LAN adapter Wi-Fi: Connection-specific DNS Suffix . : Link-local IPv6 Address . . . . . : fe80::2008:baf7:c09a:cf2d%12 IPv4 Address. . . . . . . . . . . : Subnet Mask . . . . . . . . . . . : Default Gateway . . . . . . . . . : C:\Users\user>ping Pinging [] with 32 bytes of data: Reply from bytes=32 time=40ms TTL=55 C:\Users\user>arp -a Interface: --- 0xc Internet Address Physical Address Type c4-f0-81-ba-a8-c1 dynamic ac-5f-3e-d0-a2-d0 dynamic ff-ff-ff-ff-ff-ff static 01-00-5e-00-00-16 static 01-00-5e-00-00-fb static 01-00-5e-00-00-fc static 01-00-5e-00-00-fd static 01-00-5e-7f-ff-fa static ff-ff-ff-ff-ff-ff static Answer is D

  • Sep 19, 2017, 01:37 AM

the answer is A. ARP cache is the key word.

  • Aug 24, 2017, 10:09 PM

The answer is D. The answer key is wrong from the choice, but right on the explanation.

  • Aug 17, 2017, 11:03 PM

The answer is D. I made the lab no packet tracert and presented the default gateway and mac address of the default gateway!

  • Aug 4, 2017, 12:23 PM

Yes I agree. Remember, the source and destination MAC changes as each router hop along with the TTL being decremented but the source and destination IP address remain the same from source to destination.

  • Jul 31, 2017, 12:52 AM


  • Jul 30, 2017, 09:43 PM

The answer is A. The router strips off the source and destination MAC address not the IP address.

  • Jul 26, 2017, 10:35 PM

I agree just tried the same too

  • Jun 23, 2017, 08:22 PM

Correct answer is D. Tried similar topology in GNS3, arp shows ip and mac address of default gateway

  • Jun 16, 2017, 01:50 PM

Answer : D in the explaination you can see it show answer D is currect

  • Jun 9, 2017, 03:43 PM

Answer is D, RP – Address Resolution Protocol It is used to find the MAC address from known IP address. ARP is used to convert an IP address to a physical address such as an Ethernet address (MAC Address). If a host or device transmitting data to another network (not same IP subnet), then data will forward to default gateway. In the exhibit, the Host A is transmitting data to Host B, then Host A forward the packet to Router1, for that communication Host A needs MAC address of Router1. If we check the ARP cache of Host A, we will get – 000f.2480.8916.

  • Jun 2, 2017, 09:18 AM

Destination IP AND Destination Mac address.

  • May 25, 2017, 01:55 PM

Correct answer is D

  • May 21, 2017, 05:17 PM

The answer is D

  • May 13, 2017, 01:50 PM

Right answer is D

  • May 10, 2017, 10:25 AM

SHould be D. Because ARP only show the MAC of devices in local broadcast domain.

  • Apr 30, 2017, 12:52 AM

The right answer should be D, I have tried to PING, the arp table shows one record only that map default gateway ip with its mac address

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