Note: ******* examples of troubleshooting methods you have successfully used in the past.. - explain the MPLS control plane failure... in INE video.. where.. everything is fine till PE.. but the packets were getting dropped at 'P' router due to PHP.. were the Transport label was stripped off (exposing the VPN label) one hop too soon.. This was due to the fact that, the MP-BGP neighborship was established between 2 PE routers using physical interfaces instead of loopback addresses.What are some ways youve improved network performance in the past?--- Talk about the frequent PPS issue.. then say, u get the uplink of the Nexus switch and monitor the packets per second SNMP OID.. this will trigger the EEM process once it exceeds the threshold value..That will generate a mail and a syslog message. This can alert our Network team to take necessary action beforethings go out of hand. - In a hierarchical enterprise network design, which switch should be the Root Switch?? Core or distribution...why??- What exactly is the backplane speed of a switch..- difference between layer 3 and multilayer switch?? ( basically a layer 3 switch is a switch with a router inside it.thats it!however, a multilayer switch is a switch that has a CACHE inside it to do the routing using CEF(ASIC) technology..Every layer 3 switch is a multilayer switch.. but NOT every multilayer switch is a layer 3 switch!! )- How CEF works ( like involving FIB and adjacency table )- difference between HSRP and VRRP.. their timer values...- can i run hsrp in downlink interfaces instead of svi in switches.. if so what is the advantage..how to decide where to run hsrp and vrrp..which interface..- How DOT1X works... EAP mechanism..- why private vlans can be configured only in VTP TRANSPARENT mode..?? ( the reason why is you dont want your private vlans to be propagated via VTP...- what kind of switches do hardware switching instead of software switching??? models...- diff btw bpduguard n filter..- what is the significance of OSPF process ID... how are the routes handled between 2 difference OSPF processes..- loop prevention mechanism in OSPF..- how is EIGRP a hybrid protocol..??- read about spanning tree Cost and port priority..- active and passive FTP..- How traceroute works??- need for new type of 4 bytes AS number in BGP.. [0-65535].[0-65535] to give a wider range of choice for AS numbers... right??)- does AS number gets prepended when updates flow within a single AS..?? NOOOOO!!!- can we have 2 parallel BGP neighborships between 2 routers on 2 links running between them??- BGP RIB Failure- learn what isa the problem is MPLS VPN when loopback is not made as a network type point to point..( brian says when IGP learned routes doesnot match the directly connected network IP, there will label allocation failure)