Classless addressing is a concept of addressing the IPv4 addresses. It was adopted after the failure of classful addressing. The classful addressing leads to wastage of addresses as it assigns a fixed-size block of addresses to the customer. But, the classless addressing assigns a block of addresses to the customer according to its requirement which prevents the wastage of … [Read more...] about Classless Addressing in IPv4
Classful Addressing in IPv4
Classful addressing is a concept that divides the available address space of IPv4 into five classes namely A, B, C, D & E. Nowadays, this concept has become obsolete and has been replaced with classless addressing. IP addresses, before 1993 use the classful addressing where classes have a fixed number of blocks and each block has a fixed number of hosts. In this section, we … [Read more...] about Classful Addressing in IPv4
Connection Oriented and Connectionless Services
Connection oriented and Connectionless services are the two data transmission services provided by the network layer protocols and transport layer protocols. The Connection oriented services establish a connection prior to sending the packets belonging to the same message from source to the destination. On the other hand, the connectionless service considers each packet … [Read more...] about Connection Oriented and Connectionless Services
Difference Between Entity and Attribute in Database
Entity and attribute are the most common terms of DBMS. The fundamental difference between the entity and attribute is that an entity is an object that exists in a real-world and can be easily distinguished among all other objects of real-world whereas, the attributes define the characteristics or the properties of an entity on the basis of which it is easily distinguishable … [Read more...] about Difference Between Entity and Attribute in Database
Aggregate Functions in SQL
Aggregate functions in SQL evaluate the set of values and return a single value as a result. SQL has five aggregate functions count, average, maximum, minimum, sum. The aggregate functions, 'sum' and 'average' operate only on numeric values. While count, maximum, minimum can also operate on non-numeric data such as string. In this section, we will discuss the steps to … [Read more...] about Aggregate Functions in SQL