CCIE R&S v5 Exam Review on 18 August 2015

Hello All, I’ve passed CCIE and got my number, huge relief.
My suggestions are work hard, understand all topologies.

For TS: it is important to understand the topology and traffic flow. Check each devices config to get the idea of real world and also for exam.
Because if you encounter a new fault in the ticket, you can solve it just thinking your possibilities.

For Config: If you practice more enough, do not bother about time, you will have plenty of time. And again, preconfigs there, maybe more than what we have maybe less, but you have to know each detail. In the exam, when you see the config screen and device, you’ll understand how you manage it.

For Diag: two questions are enough to pass, it seems. Section is pretty easy to navigate between device config, console logs, topology.

DIAG

Watch the Cisco Live session video there or four times to see DIAG section.
1) vtp password
first looked what I had in options in the drop down, then search first vtp revision number. luckily on SW3, rev 0, while others are not.

2) R16 increase subnet.

Answer are which device have cause of the problem and what to do. Click on R16 on topology (circles same as live video)
On the config you will see R16’s interface IP is /29.

3) URPF

Long question, not sure I chosed correct options but attached a draw.
Question, PCs cannot ping 5.6.7.8

ROUTING
R1 has just one BGP route, default route multipath
m 0.0.0.0/0 R2
0.0.0.0/0 R3

R1 has PCs IP address and do nat to two IP addresses.

R2 has a loopback 1.2.3.4/32
R3 has a loopback 5.6.7.8/32
BGP POLICY

R2 and R3 has prefix-list matching R1s IP addresses (NAT IPs)
two route-maps for each:
first RM applying communities to these prefixes.
second RM, applying local pref to communities and use it in BGP ” neighbor R2 in”

R2 chooses one NAT IP as R3 best
R3 chooses one NAT IP as R2 best

URPF
R1’s interface towards R2 and R3 are urpf with loose mode (no access-list)
R2 and R3’s interface to R1 is urpf Strict (no access-list)

So while R1 sends packet with load-balance as it has multpath DR,
R2 receives it but it has strict on its interface to R1 and also in its table R3 as best so drop the packet mode urpf
same

R3 receives it but it has strict on its interface to R1 and also in its table R2 as best so drop the packet due to strict mode urpf

Two questions:
what is the reason
strict mode with per dest/packet

Drag and drop: explain the flow why traffic dropped.
There are two many options so eventually you are lost in the question.
But I think i got partial points there.