Networking Based Interview Questions
OSPF
* Describe OSPF in your own words.
* OSPF areas, the purpose of having each of them
* Types of OSPF LSA, the purpose of each LSA type
* What exact LSA type you can see in different areas
* How OSPF establishes neighboor relation, what the stages are
* If OSPF router is stucked in each stage what the problem is and how to troubleshoot it
* OSPF hierarchy in the single or multi areas. Cool OSPF behavior in broadcast and nonbroadcast
* Draw the diagram of typical OSPF network and explain generally how it works, DR, BDR, election, ASBR, ABR, route
redistribution and summarization
STP
* How it works and the purpose
* Diff types (SSTP, MSTP, RSTP) Cisco - PVST/PVST+
* root election
* Diff. port stages and timing for convergence
* Draw the typical diagram and explain how diff types of STP work
* What ports are blocking or forwarding
* How it works if there are topology changes
ACLs
* What are they
* Diff types
* Write an example if you want to allow and to deny...
* Well-known port numbers (DNS - 53 and etc...)
QOS
* What is that
* What is the diff b/w L2 and L3 QoS
* How it works
Network:
* Draw the typical network diagram you have to deal with
* explain how it works
* What part of it you are responsible
* firewall, what is that, how it works, how it is diff from ACLs
* What problems with the network you had had and how you solved it.
* What are the ways to troubleshoot the network, techniques, commands
* network security, ways to achieve it
Switching:
* VLANs
* STP
* How a L2 switch works with broadcast, unicast, multicast, known/unknown traffic
* VRRP, GLBP
* port monitoring and mirroring
* L3 switch, how it works
* PIM sparse and dense modes
