CCNA question what's the answer

HodgeHi · 14-07-2008, 12:33 PM

Hello,

I am looking through a demo course for a CISCO CCNA online course.

I have come across a question where i think i have the right answer but yet it does not seem to accept it. I may be wrong but i don't think it is

So what do you guys think?

ICTNUT · 14-07-2008, 12:50 PM

What do you think the correct answer is??

HodgeHi · 14-07-2008, 12:56 PM

None ticked for switch to forward the frame and the frame is unicast but dropped as the port number for the destination is the same as the source which is what the switch should do according to the help section.

Am i right?

Here's what the help says...

Technomancer · 14-07-2008, 02:00 PM

Given that the diagram has the MAC address for 0B entered in the table I'd suggest a typo in the question. Frankly not that unusual with Cisco materials.

Geoff · 14-07-2008, 02:11 PM

Answer to part 1:

The destination MAC address is '0E'. According to the MAC table '0E' lives at port Fa9. Therefore the switch will forward the frame to port Fa9.

Answer to part 2:

A is false. The switch already has the source MAC address recorded in it's MAC table correctly.
B is false. The frame is not a broadcast frame.
C is true. This is the normal operating behaviour for a switch dealing with unicast frames once it's located the destination mac address/port pair.
D is false. As far as we've been told, the switch hasn't exceeded it's memory/cpu capacity. This is the only situation, aside from misconfiguration, when such a thing would occur.
E is false. The switch knows where the destination is and has not been instructed to drop frames to the destination port/mac as far as we've been told.

ICTNUT · 14-07-2008, 02:35 PM

I agree with Geoff.

HodgeHi · 14-07-2008, 02:42 PM

I will let you know if you are correct as i have continued on. Give me about ten minutes and i should be able to post up if it was accepted.

HodgeHi · 14-07-2008, 02:52 PM

Ok i put in Fa9 and C.

drum roll....

Fa9 was rejected as being the wrong answer.

If i do not choose any for Q1 it says that Q2 answer C is incorrect.

andy · 14-07-2008, 02:56 PM

Surely 0E has already received the data, being connected to the same hub as 0F. Would the switch forward the data to the port where it had received from? Or would it realise that the destination should already have received, and so drop it?

Hmmm...

HodgeHi · 14-07-2008, 03:00 PM

If the switch resends the data back to the host that is supposed receive the data then the host will receive it twice. This is, i assume, why the switch drops the frame when coming from the same port as destination.

webman · 14-07-2008, 03:00 PM

Don't tick anything for question 1.

HodgeHi · 14-07-2008, 03:02 PM

@webman

I haven't ticked anything for Q1 but Q2 is still wrong. I think i have tried nearly every single combination available (probably apart from the right one).

webman · 14-07-2008, 03:03 PM

The last option for Question 2.

HodgeHi · 14-07-2008, 03:13 PM

I also chose the last one. It never tells me that it is correct. I think there is a problem with this question. I have emailed it to the course tutor.

Thanks for all your responses. Keep 'em coming

torledo · 14-07-2008, 03:25 PM

I think there is something wrong with the answer options....

the switch should not be forwarding the frame at all....it should be filtering the frame by dropping it at port FA09 due to their being two MAC addresses associated with the FA09 port in the MAC address table. By filtering, the switch is doing it's job of restricting network communication to the segment where the frame is originating and where the intended destination happens to be..in this case hosts A and B connected to the hub.

In other words the question to which port is the frame forwarded should not apply.

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14-07-2008, 02:00 PM	#4
Technomancer Join Date: Nov 2006 Location: UK Posts: 15 Thanks: 0 Thanked 1 Time in 1 Post Rep Power: 0	Cisco Typo Given that the diagram has the MAC address for 0B entered in the table I'd suggest a typo in the question. Frankly not that unusual with Cisco materials.

14-07-2008, 02:52 PM	#8
HodgeHi Join Date: May 2006 Location: West Brom Posts: 952 Thanks: 64 Thanked 22 Times in 19 Posts Rep Power: 10	Ok i put in Fa9 and C. drum roll.... Fa9 was rejected as being the wrong answer. If i do not choose any for Q1 it says that Q2 answer C is incorrect. Last edited by HodgeHi; 14-07-2008 at 02:54 PM..

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CCNA question what's the answer

14-07-2008, 12:50 PM	#2
ICTNUT Join Date: Jul 2005 Location: Hereford Posts: 765 Thanks: 37 Thanked 39 Times in 14 Posts Rep Power: 15	What do you think the correct answer is??

14-07-2008, 02:11 PM	#5
Geoff Join Date: Jun 2005 Location: Fylde, Lancs, UK. Posts: 9,931 Thanks: 42 Thanked 230 Times in 209 Posts Blog Entries: 1 Rep Power: 67	Answer to part 1: The destination MAC address is '0E'. According to the MAC table '0E' lives at port Fa9. Therefore the switch will forward the frame to port Fa9. Answer to part 2: A is false. The switch already has the source MAC address recorded in it's MAC table correctly. B is false. The frame is not a broadcast frame. C is true. This is the normal operating behaviour for a switch dealing with unicast frames once it's located the destination mac address/port pair. D is false. As far as we've been told, the switch hasn't exceeded it's memory/cpu capacity. This is the only situation, aside from misconfiguration, when such a thing would occur. E is false. The switch knows where the destination is and has not been instructed to drop frames to the destination port/mac as far as we've been told.

14-07-2008, 02:35 PM	#6
ICTNUT Join Date: Jul 2005 Location: Hereford Posts: 765 Thanks: 37 Thanked 39 Times in 14 Posts Rep Power: 15	I agree with Geoff.

14-07-2008, 02:42 PM	#7
HodgeHi Join Date: May 2006 Location: West Brom Posts: 952 Thanks: 64 Thanked 22 Times in 19 Posts Rep Power: 10	I will let you know if you are correct as i have continued on. Give me about ten minutes and i should be able to post up if it was accepted.

14-07-2008, 02:56 PM	#9
andy Join Date: Jun 2005 Location: Preston, Lancashire Posts: 618 Thanks: 4 Thanked 2 Times in 2 Posts Rep Power: 9	Surely 0E has already received the data, being connected to the same hub as 0F. Would the switch forward the data to the port where it had received from? Or would it realise that the destination should already have received, and so drop it? Hmmm...

14-07-2008, 03:00 PM	#10
HodgeHi Join Date: May 2006 Location: West Brom Posts: 952 Thanks: 64 Thanked 22 Times in 19 Posts Rep Power: 10	If the switch resends the data back to the host that is supposed receive the data then the host will receive it twice. This is, i assume, why the switch drops the frame when coming from the same port as destination.

14-07-2008, 03:00 PM	#11
webman Join Date: Nov 2005 Location: County Durham Posts: 5,668 Thanks: 105 Thanked 87 Times in 71 Posts Blog Entries: 1 Rep Power: 38	Don't tick anything for question 1.

14-07-2008, 03:02 PM	#12
HodgeHi Join Date: May 2006 Location: West Brom Posts: 952 Thanks: 64 Thanked 22 Times in 19 Posts Rep Power: 10	@webman I haven't ticked anything for Q1 but Q2 is still wrong. I think i have tried nearly every single combination available (probably apart from the right one).

14-07-2008, 03:03 PM	#13
webman Join Date: Nov 2005 Location: County Durham Posts: 5,668 Thanks: 105 Thanked 87 Times in 71 Posts Blog Entries: 1 Rep Power: 38	The last option for Question 2.

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14-07-2008, 03:13 PM	#14
HodgeHi Join Date: May 2006 Location: West Brom Posts: 952 Thanks: 64 Thanked 22 Times in 19 Posts Rep Power: 10	I also chose the last one. It never tells me that it is correct. I think there is a problem with this question. I have emailed it to the course tutor. Thanks for all your responses. Keep 'em coming

14-07-2008, 03:25 PM	#15
torledo Join Date: Oct 2007 Posts: 1,810 Thanks: 59 Thanked 61 Times in 54 Posts Rep Power: 18	I think there is something wrong with the answer options.... the switch should not be forwarding the frame at all....it should be filtering the frame by dropping it at port FA09 due to their being two MAC addresses associated with the FA09 port in the MAC address table. By filtering, the switch is doing it's job of restricting network communication to the segment where the frame is originating and where the intended destination happens to be..in this case hosts A and B connected to the hub. In other words the question to which port is the frame forwarded should not apply.