1) What is Baud Rate ?

ANSWER:

The baud rate is the rate at which information is transferred in a communication channel
“2400 baud” means that the serial port is capable of transferring a maximum of 2400 bits per second.”
For an asynchronous serial transmission it requires 1 start bit and 2 stop bits and for synchronous transmission we don’t need start and stop bits. 

2)  What is PING ?
ANSWER:

Packet Internet Groper is a computer program that is used to test the network connectivity between two systems. These systems can be a normal Personal computer, a Large Server, Router, switch or a gateway.PING uses ICMP to check connectivity of host to Internet(IP) layer. It send message to host computer to destination computer and then echoed back from destination to host computer. It also checks RTT. So, If it is not echoed back then there must be some error

The Internet Control Message Protocol (ICMP) is one of the main protocols of the internet protocol suite. It is used by network devices, like routers, to send error messages indicating, for example, that a requested service is not available or that a host or router could not be reached.

3) Remember this diagram 

NOTE:

Precision is the number of digits we can represent accurately. 

1.2×1081.2×108 – precision is just 2 and rest we have 8 zeroes which might not be accurate. 

So, in IEEE 754 floating point representation we have 23 precision bits and we also have one implied bit before ‘.’ making it 24 precision bits. With 24 bits we can represent ⌊24log2⌋=7⌊24log⁡2⌋=7decimal digits.

4) Link State Routing algorithm is used by OSPF routing Protocol.

REference : https://en.wikipedia.org/wiki/Open_Shortest_Path_First