Question

The decimal number 210 expressed in binary is ____.

11010011

11011011

11010010

11010111

____ is the most important layer 3 security protocol.

ARP

NAT

DNS

IPSec

Answer 1

The decimal number 210 expressed in binary is ____.

Answer : Option 3 : (11010010)₂

Explanation :

To convert any number in binary, factor the number by 2 and calculate the remainders at repeated step until the quotient is 1. After that at bottom from final quotient to first remainder sequence wise combinations of digits (0 or 1 or 0 and 1 both), will generate the binary number.

According to that for decimal number 210

        The binary of 210 is    (11010010)₂

____ is the most important layer 3 security protocol.

ARP

NAT

DNS

IPSec

Answer: Option 4 :   IPSec

Explanation:

The security services provided by IPSec are as followed.

i. Authentication: It can provide the authentication of data without encrypting data, like it helps to identify the actual origin of data source.

ii. Data confidentiality: It also encrypts the application layer data and protects data while passing through public network.

iii. Virtual private networking: IPSec tunneling is used for data being sent between the two endpoints as encrypted, which is known as a Virtual Private Network(VPN) connection.