Networking Based Interview Questions

[Kalyan]

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