DNS Queries
(i) Recursive DNS queries : web browser → recursive server, (ii) Iterative DNS queries : Query send to one after one server to find the
(i) Recursive DNS queries : web browser → recursive server, (ii) Iterative DNS queries : Query send to one after one server to find the
These are used to resolve DNS query(domain→ ip) one by one if early stage fails goes next (i). Recursive server : DNS Database maintained by
Web Domain types : (i) Generic domains → ex: com,biz,tech (ii) Country domains – country specific → ex : .in (iii) Inverse domain → from
When user enters a web address → Browser sends a message(recursive DNS query) to the network to find out which IP corresponding to it recursive
DNS is naming database in which internet domain names are located and translated into Internet Protocol (IP) addresses. Process of a DNS resolution : When
‘Crypto’ means secret or hidden. Cryptography is the science of secret writing with the intention of keeping the data secret. Types : 1. Symmetric Cryptography
Transmission Delay : Time taken to put a packet onto link Propagation Delay : first bit to travel Queuing Delay : Time taken for job
Feature TCP UDP Connection status Requires an established connection to transmit data (connection should be closed once transmission is complete) Connectionless protocol with no requirements
it is connectionless and an unreliable protocol for communications that helps in between the different devices over a network. So, there is no need to
It is a connection-oriented protocol for communications that helps in between the different devices over a network. It lies between the Application and Network Layers.