Interview question for Network Engineer

      1. What will be the new subnet mask of the IP 192.168.1.1/24  if we divide it to two networks

          

               It will be 255.255.255.128

      2.    What do you call a communication system in which data cannot be sent in both directions at the same time?

         Half duplex

3.    3.    Private IP range

               Class A:- 10.0.0.1 to 10.255.255.254                    

               Class C:- 192.168.0.1 to 192.168.255.254

               Class B  :- 172.16.0.1 to 172.31.255.254

       4.   Which  devices breaks up a Broadcast Domain by default?

           Answer: Router

       5.  What is a gateway or Router?

             A Device that is connected to two or more networks is commonly called as router or    
             Gateway. It generally forwards                  message from one network to another.

      6.   What are the key elements of protocols?

            The key elements of protocols are
             a. Syntax
                It refers to the structure or format of the data, that is the order in which they are presented.
             b. Semantics
              It refers to the meaning of each section of bits.
              c. Timing
            Timing refers to two characteristics: When data should be sent and how fast they can be sent.

      7.  What is bandwidth?

             Network performance is measured in Bandwidth (throughput) and Latency (Delay). Bandwidth in a  network is the number   of bits that can be transmitted over the network in a certain period of time. In plain English it may be capacity of a link

      8.  What are the concerns of the Physical Layer?

          Physical characteristics of interfaces and media
                a. Representation of bits
                b. Data rate
               c. Synchronization of bits
               d. Line configuration
               e. Physical topology
               f. Transmission mode.

      9.  What are the concerns of the Physical Layer?

                 a Framing
                b. Physical Addressing
                c. Flow Control
                d. Error Control
                e. Access Control

10. Basically why we need to use VLAN in Switch?
      
               For increasing the number of Broadcast Domain.