IP ADDRESSING IP addressing is a mechanism which gives a unique number to every computer which is connected to network. every computer has different IP address so that we can easily differentiate various computers attached to network. What is IP Address? The full form IP address is Internet Protocol Address. […]
Encryption: Encryption is a technique for transforming information on a computer in such a way that it becomes unreadable for unauthorised person. if someone is able to gain access to a computer with personal data on it, they likely won’t be able to do anything with the data unless they have […]
IEEE STANDARDS: 802 Overview Basics of physical and logical networking concepts. 802.1 Bridging LAN/MAN bridging and management. Covers management and the lower sub-layers of OSI Layer 2, including MAC-based bridging (Media Access Control), virtual LANs and port-based access control. 802.2 Logical Link Commonly referred to as the LLC or […]
RSA ALGORITHM The full form of RSA is Ron Rivest, Adi Shamir and Len Adleman who invented it in 1977. The RSA cryptosystem is the public key cryptography algorithm . It can be used to encrypt a message without the need to exchange a secret key separately. It can be […]
Monoalphabetic Substitution Cipher in which every alphabet have unique alphabet and we can not use same for another alphabet in cipher text. Polyalphabetic cipher was invented by Johannes Trithemius in the 15th Century. To remove this limitation, Polyalphabet cipher is introduced in which we can use alphabet for any number. […]
QUESTION: An Internet Service Provider (ISP) is granted a block of addresses starting with 145.75.0.0/16. The ISP needs to distribute these addresses to three groups of customers as follows: (a) The first group has 128 customers; each needs 256 addresses. (b) The second group has 128 customers; each needs 64 […]
Monoalphabetic Substitution Cipher: It also known as substitution cipher. Replacement of alphabets or digits are fixed for each letter. For example: Plain text : nikhilarora Cipher text: OJLIMBSPSB In the above example, the value of ‘a’ is fixed for every time as ‘B’ and every alphabet is fixed for separate […]
Basic Terms to be used : plaintext – It is a kind of original message ciphertext – It is a type of coded message cipher – An algorithm to be performed for transforming plaintext/ciphertext. key – The information used in cipher known only to sender and receiver. encipher (encrypt) – […]
we will discuss this topic with help of one question asked in CBSE NET JAN 2017 PAPER 3 QUESTION: An analog signal has a bit rate of 8000 bps and a baud rate of 1000. Then analog signal has ………….. signal elements and carry ………… data elements in each signal. […]
This question asked in JAN 2017 PAPER 3 Question 28: In a packet switching network, if the message size is 48 bytes and each packet contains a header of 3 bytes. If 24 packets are required to transmit the message, the packet size is …… (1) 2 bytes (2) 1 […]
