1. Tell me about your current role, current responsibility, and daily activities.
2. Which part of network do you handle? What kind of network is it? Can you elaborate?
3. High level steps of migrating devices from 6500 series to 9600 series?
4. Detail about migration plan..... on the night of the migration, What did you do exactly to migrate and what was the customer interruption.
5. Let's say if old cables are connecting to 6500 chassis and traffic flowing towards 6500 chassis and you want to migrate to 9500 chassis, How would you route the traffic from 6500 to 9500 ? would you move the cable from 6500 to 9500 chassis directly or would we have any plan to offload the traffic from 6500? How would you smoothly move the traffic from 6500 to 9500 with no or minimal impacts.
How would you move the traffic from 6500 to 9500 with respect to configuration? How would you configure?
6. Default behavior of route reflector when receiving multiple copies of same route from different source/different routers?
Let's say we have a route reflector, and two or more RR clients are sending the same route, Which route RR would it reflect and why?
Answer: RR would reflect the best route only to its other RR clients.
Let's say if I want RR to reflect same route receiving from different routers, How would we achieve that? load balance....
Answer: command....
7. Let's say we have a customer A (Customer edge) in MPLS and it has two sites, both are running BGP, and both are in same autonomous system, would this topoly work?
Answer: Command as-overwrite.
Let's say if i have a CE that's multihomes, and two different ISPs, How can we influence the traffic between two ISPs.
Answer: Local Preference, or MED (MED is more practical)
Which type of MED we would be using? Two types of MED, can you tell the difference between the both?
Answer: ____________ MED is used for same AS.
When do we apply local preference configuration and how do we do that?
Let's say you have two CE (CE1 and CE2) and you connecting to Verison and you have LAN behind CE1 and CE2, How can you configure CE1 as Main router, and CE2 as secondary router and connect to ISP.
Answer: Using Redundancy protocol - HSRP.
8. Why do we need route Dampling in BGP?
9. What's the protocol that is running in your current organization? LAN environment and WAN environment?
10. When it's okay to have OSPF neighbor stuck at 2-way state? When it's normal behavior for OSPF neighbor to stuck at 2 way state and we don't want it to change?
11. Let's say we have a full mutual distribution between BGP and OSPF, what would be the risk? What is bad about this redistributed topology?
Answer: High CPU usage on IOS due to many redistribute route, routing table size could increased, and most importantly this kind of topology can cause loops in our network.
12. In OSPF, let's say we have two ASBR redistributing the same routes from other autonomous system. Both ASBRs are advertising the same routes from other AS, how can we manipulate the behavior of ASBR so that all the traffic goes to a single ASBR.
Answer:
13. Let's say if you want ASBR to only advertise E1 routes in rest of OSPF topology but E2 should be blocked, how would we do that?
14. How will you take OSPF router out of server, Let's say there's router is OSPF which we dont want to use anymore and want to remove from OSPF network, how would we do that smoothly without interrupting traffic?
Answer: By using an option in OSPF known as overloop in OSPF- it will advertised a LSA with infinite loops.
15. How OSPF handles loops in multiarea network
Answer: using Area 0 as all routes are travelling through Area 0
