CCIE R&S v5 Exam Review on 23 May 2016

The second fault is to change the OSPF costs in the link between SW100 and SW11 so it can match exactly the trace
4- Follow the traze between User 5 and Server 2.
The initial traze was going through the MPLS, I did first the MPLS ticket, so when I applied better local preference in R15 it preferred the path through LOCALSP, but then my trace was not exactly the same that they asked to me, so i played with OSPF costs, but then I realized that I was disrupting the T3 (because I was playing with the OSPF cost in DataCenter2) and it was a question of 4 points, so of the two traceroutes that they showed to you I was correct in one.
5 / DMVPN point to multipoint. you have to match the same routes as is the question
6/ DHCP snooping/ Quite straight forward
7 DMVPN in NHRP state. Tunnel key missmatch
8 MPLS
As is a question of 4 points there are two kinds of faults.
First problem LDP on R1 was not populated due to the Loopback 0 of R1 was not in the OSPF process
Second problem R5 was exporting the wrong RT
You have to be sure that your trace is exactly the same, I did not have to change any OSPF cost
9 Advertise LAN of Server 1 in R15
There is an aggregate network that fullfils all the networks in DataCenter 1, you need to create in BGP one statement of this range in order to create the aggregate so the ISP1 knows how to reach Server1
10/ Double NAT tricky
About this question they ask you to translate in R25 the source and the destination so you have to play with ip nat inside and ip nat outside. Important to notice that the source is a network that does not exists in the HUB so we will not have a routing problem

DIAG
Question 1 HSRPv6
CE1 (Highest HSRP priority, nd router preference low) CE2 (Lowest HSRP priority, nd router preference high)
I was afraid with this part but If you have labed the scenario its quite straight forward
Fisrt Question – What would you do to rapidely fix the issue
– Change the HSRP priority of CE2 to the highest
In this question I did not have the option of put nd router preference of CE1 to high, the only other question i considered was shuting down the port in PE1 connecting to CE1, but If you see the configurations there is no tracking configured on CE1, so it was only one option correct

Second Question – What is the cause of the problem? Which device is causing this issue?
I answered – Gateway Default preference and the device was an unknown device on LAN
I was here a little bit concerned because you can choose that is a HSRP problem priority of CE2, but come one, you are answering in the previous question the same so they want you to go further, so If you lab you know that if you change the priority of CE2 you are just fixing temporaly and if CE2 goes down the traffic will not work through CE1, so the real problem is the unknow device on LAN that is putting a wrong RA in your network

Third Question / Which is the first line in the wireshark capture that shows you the issue
Line 193 – You can see a RA from FE80:666
he one we have configured in HSRP is FE80:0011, so when we receive this one is breaking our connectivitu

Second Question Multicast Same answers they have post it
1-Route cause: R3 has not route towards RP
2- Ask an engineer: Why the R3(RIB) has not a route towards R4
3 – Ip route 10.4.4.1 0.0.0.0 10.1.17.1