Interview question for network engineer and System Engineer

      1. What types of network do you have experience with?

         

      It may be cisco or microtik or etc with which environment (linux or windows)

 

     2. What can you tell me about the OSI Reference Model?

       It provides a framework for discussing network design and operations. It groups communication  functions into 7 logical layers.

      3. What monitoring tools or approaches do you rate?

        It may be nagios, Cacti, observium, Solarwinds etc.

      4. What are the benefits of subnetting?

      Subnetting reduce the size of the routing tables. It’s also provide security to network traffic by isolating it from the rest of the network. 

       5. Why we use Tracert/traceroute command  and what protocol does it use?

         We use this command to trace the path where the problem occur and we can tell exactly where the chain of connections stop. It also use ICMP protocols like ping.

       6.  Whats the difference between Hub,Switch and Router.

         It may be “the biggest difference between hub and switch is not on the outside, but on the inside in the way that they handle connections. In the case of a hub, it broadcasts all data to every port. This can make for serious security and reliability concerns, as well as cause a number of collisions to occur on the network. Where as switch uses the table to select the port connected to destination.

       Router is different from hub and switch. It  drops the request which has no destination in routing table.

       7. What is DNS.

         It may be “ In plain English it is internet phone book. We can easily remember the name of website instead of IP address. For this we use Domain Name System.

       8. Tell Some utility tools or Programs by which we can remote login?

          It may be SSH,Telnet etc
  
       9. Router, Switch, Hub, Firewall works in which Layer. 

           Router - Layer 3.
           Switch - Layer 2.
           Hub     - Layer 1
           Firewall-Layer 3,4 

      10. Port number of ftp, ssh, telnet, dns, smtp, pop3
          
          FTP    = 21,
         SSH    = 22
         Telnet  = 23 
         dns      = 53
         smtp   = 25
         pop3   = 110
         http     = 80
        




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