To make the transport services reliable, TCP hosts must establish a connection-oriented session with one another. Connection establishment is performed by using the three-way handshake mechanism. A three-way handshake synchronizes both ends of a network by enabling both sides to agree upon original sequence numbers. This mechanism also provides that ... Read More

Computer Network provides several uses, both to organizations and individual users.Resource SharingThis is the main purpose of a computer network. It defines creating all programs, peripherals and data feasible to anyone computer on the network to all other computers without considering the physical areas. Thus a user at a considerable ... Read More

The network layer design issues contain the services position to the transport layer, routing packets over the subnet, congestion control, and connection of multiple networks together.The design issues of the network layer are as follows −It is the network layer's goals to support logical services to several users linked to ... Read More

Bridges are used to connect two subnetworks that use interchangeable protocols. It combines two LANs to form an extended LAN. The main difference between the bridge and repeater is that the bridge has a penetrating efficiency.Working of BridgesA bridge accepts all the packets and amplifies all of them to the ... Read More

A sliding window is also known as windowing. A sliding window is a method for controlling sending data packets between two network devices where dependable and sequential delivery of data packets is needed, such as using the Data Link Layer (OSI model) or Transmission Control Protocol (TCP).In the sliding window ... Read More

The services provided by the transport layer are explained below −Address MappingIt means mapping of transport address onto the network address. Whenever a session entity requests to send a transport service data unit (TSDU) to another session entity, it sends its transport service access point address as its identification. The ... Read More

CPU stands for Central Processing Unit. It is the soul of a computer system. The CPU along with the memory and the I/O sub-systems establish a strong computer system.A CPU includes small layers of hundreds of transistors. Transistors are microscopic bits of substances that block electricity at one voltage (non-conductor) ... Read More

Substitution technique is a classical encryption approach where the characters present in the initial message are restored by the other characters or numbers or by symbols. If the plain text (original message) is treated as the string of bits, thus the substitution technique would restore bit pattern of plain text ... Read More

The I/O interface supports a method by which data is transferred between internal storage and external I/O devices. All the peripherals connected to a computer require special communication connections for interfacing them with the CPU.I/O Bus and Interface ModulesThe I/O bus is the route used for peripheral devices to interact ... Read More

The D flip-flop is a clocked flip-flop with a single digital input 'D'. Each time a D flip-flop is clocked, its output follows the state of 'D'. The D Flip Flop has only two inputs D and CP. The D inputs go precisely to the S input and its complement ... Read More