ARP 1

[omegabetax]

I have 2 Routers R1 and R2, each one with a switch directly conected. SW1 have 3 hosts(A,B,C)and SW2 only one(D).
The hosts are connected to the switch as shown. The switches are in their default configuration. Host A needs to communicate with host D, but host A does not have the MAC address for its default gateway. Which network hosts will receive the ARP request sent by host A?
only host D
only router R1
only hosts A, B, and C
only hosts A, B, C, and D
only hosts A, B, C, and router R1

In my opinion the response must be: B,C and R1 but I don't have such an option.
Can someone 'iluminate' me ?

 

[sstoppel]

I see your confusion - I guess it is a question as to whether the transmitting card can hear its own broadcast. I think the answer is yes.

My rational is that you can ping 127.0.0.1 to verify the stack is ok, then you can ping your own IP to verify your connection is good.

 

[Niltinho]

Hi,
you need to describe the diagram connection for us.

Is it ABC--SW1----R1---------R2----SW2--D ? If so R1 only.

Niltinho
BEng,CCNA,MCSA,CNA

 

[omegabetax]

The diagram is correct. It's about CAM memory from switch ?

Thanks

 

[sstoppel]

an arp broadcast is sent to all hosts on a switch. The router knows that the IP is not local, and responds with the MAC address of it's ethernet port connected to switch SW1.

The answer is A, B, C, and router R1.

 

[omegabetax]

But a switch make forwarding to all ports except the source port.

 

[CiscoGuy33]

omegabetax,

You are correct - the switch will not send the broadcast back the same port it came from. So the correct answer is Host B, C and the router.

FYI - some books and questions you find have WRONG answers, many books have erata pages at their websites with all the mistakes and corrections listed.

Test Kings are known for having wrong answers and mis-worded questions - lots of other questions you find on the Internet started as TestKings so some just build on wrong information.

Just be aware as you study for the CCNA exam - question everything and if it does not look right - LOOK IT UP - so you are sure of the answer.

Just my thoughts!


E.A. Broda
CCNA, CCDA, CCAI, Network +