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CCIE RS Written updated 27-October-2018

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Q81

Refer to the exhbit. While troubleshooting a connectivity issue, you executed a trace route that returned the given output. which conclusion can you draw about the problem?

A. The PDUs transmitted errors

B. An ACL is blocking traffic

C. The destination is too busy

D. Packets are being fragmented

 

Answer: C

I think B is correct.

 

I do not know the command that results in the exhibit.

Assume the results occur the router.

PC <---> the router

Please observe "0 time exceeded" that means the router did not send an "ICMP Time Exceeded Message" back to PC.

So I think the traceroute packet (UDP) was blocked.

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Q81

Refer to the exhbit. While troubleshooting a connectivity issue, you executed a trace route that returned the given output. which conclusion can you draw about the problem?

A. The PDUs transmitted errors

B. An ACL is blocking traffic

C. The destination is too busy

D. Packets are being fragmented

 

Answer: C

I think B is correct.

 

I do not know the command that results in the exhibit.

Assume the results occur the router.

PC <---> the router

Please observe "0 time exceeded" that means the router did not send an "ICMP Time Exceeded Message" back to PC.

So I think the traceroute packet (UDP) was blocked.

 

you can see the source quench on the exhibit

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Q81

Refer to the exhbit. While troubleshooting a connectivity issue, you executed a trace route that returned the given output. which conclusion can you draw about the problem?

A. The PDUs transmitted errors

B. An ACL is blocking traffic

C. The destination is too busy

D. Packets are being fragmented

 

Answer: C

I think B is correct.

 

I do not know the command that results in the exhibit.

Assume the results occur the router.

PC <---> the router

Please observe "0 time exceeded" that means the router did not send an "ICMP Time Exceeded Message" back to PC.

So I think the traceroute packet (UDP) was blocked.

 

I think you need to study a bit more about the quench packets seen in the output. well I can't blame you it's hard to see with the logo printed on "h".

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the answer is C.

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Hi all

I think that DD of PIM is incorrect

for sparse dense mode : specific operation depends on wether the RP is know (so it can operate in dense or sparse)

for sparse mode : build shared trees optionally transition to source, because for sparse dense if it operate in dense it will never be in shared tree

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Hey guys... i found TWO that are incorrect.

 

Question page 103 of the PDF created from Argentina.

 

The answer says that the applet will run ONLY when OSPF neighbors are verified, which is NOT correct.

 

The applet will run anyways, as soon as it sees the OSPF-5-ADJCHG: log, and as PART of the applet it will check the OSPF neighbors.

 

So, IMHO, the correct answer is B(the applet runs before any commands are executed) and E, and NOT A and E.

 

 

Question page 108 of the PDF created from Argentina.

 

This is about MSDP. The answer here is A and E, but E is incorrect.

 

E. It requires multicast sources to be in the same domain.

 

What??? We are using MSDP to connect sources to different domains.... how this is the correct one?

 

I would go with A and C, as it uses loopback addresses for anycast RP

 

Cheers

Edited by net4life

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Hey guys... i found TWO that are incorrect.

 

Question page 103 of the PDF created from Argentina.

 

The answer says that the applet will run ONLY when OSPF neighbors are verified, which is NOT correct.

 

The applet will run anyways, as soon as it sees the OSPF-5-ADJCHG: log, and as PART of the applet it will check the OSPF neighbors.

 

So, IMHO, the correct answer is B(the applet runs before any commands are executed) and E, and NOT A and E.

 

 

Question page 108 of the PDF created from Argentina.

 

This is about MSDP. The answer here is A and E, but E is incorrect.

 

E. It requires multicast sources to be in the same domain.

 

What??? We are using MSDP to connect sources to different domains.... how this is the correct one?

 

I would go with A and C, as it uses loopback addresses for anycast RP

 

Cheers

 

Thank you net4life. The question on page 103 has been corrected in previous discussion. For question on page 108, discussed as well, as far as I can remember, there is not any final conclusion yet.... there was A and D as well.

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Hi

can anyone confirm if the PIM drag and drop is correct ? page 114

 

i think it's not

the correct answer for me is

sparse dense mode : specific operation depends on wether the RP is know

sparse mode : build shared trees optionally transition to source

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Thank you net4life. The question on page 103 has been corrected in previous discussion. For question on page 108, discussed as well, as far as I can remember, there is not any final conclusion yet.... there was A and D as well.

 

D is incorrect. Read the answer carefully

 

D. It uses 32-bit anycast RP addresses.

 

There is NO such thing as 32 bit anycast RP address. They want to confuse you. If it was something like "It uses IPv4 32 bit address AS the RP address, that would be correct.

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Hi

can anyone confirm if the PIM drag and drop is correct ? page 114

 

i think it's not

the correct answer for me is

sparse dense mode : specific operation depends on wether the RP is know

sparse mode : build shared trees optionally transition to source

 

 

I agree with you. Sparse-mode CAN switch to source as long as it passes a certain threshold.

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