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Carrier Sense Multiple Access (CSMA) is a random-access protocol (multiple access protocol) that is used to minimise the chance of collision and increase performance. The main principle used is 'sense before transmit'. CSMA is using a shared medium which means any data passed with a common interconnection network.The Carrier Sense Multiple Access (CSMA) Protocol is diagrammatically represented as follows −Suppose the sender places a frame without sensing the status of the channel it will lead a collision with other nodes, if the other node also sends frames to the shared memory. So we sense before transmitting.There are mainly two conditions ... Read More
Carrier Sense Multiple Access (CSMA) is a random-access protocol (multiple access protocol) that is used to minimise the chance of collision and increase performance. The main principle used is 'sense before transmit'. CSMA is using a shared medium which means any data passed with a common interconnection network.The Carrier Sense Multiple Access (CSMA) Protocol is diagrammatically represented as follows −Suppose the sender places a frame without sensing the status of the channel it will lead a collision with other nodes, if the other node also sends frames to the shared memory. So we sense before transmitting.There are mainly two conditions ... Read More
Aloha is a packet switching system. The time interval required to transmit one packet is called a slot. Aloha is a random access technique.There are two ALOHA protocols as follows −Pure ALOHASlotted ALOHANow let us see what Slotted ALOHA is −Slotted ALOHAThe slotted ALOHA is explained below in stepwise manner −Step 1 − Slotted ALOHA was introduced to improve the efficiency of pure ALOHA, because in pure ALOHA there is a high chance of collision.Step 2 − In this protocol, the time of the shared channel is divided into discrete intervals called as slots.Step 3 − The stations can send ... Read More
Multiple access protocols are generally used to coordinate access to link, here nodes can regulate their transmission onto the shared broadcast channels by using multiple access protocol, It is used on both wired and wireless LAN and satellite network.Multiple nodes can transmit frames at the same time, if so the transmitted frame collides at the entire receiver. When there is a collision, there is no acknowledgement to the receiver that the frame is transmitted or not.Thus, all frames involved in the collision are lost, and the broadcast channel is wasted during the collision interval. To rectify this problem Multiple Access ... Read More
In wireless networks, a channel can be allocated between source and destination, and in between source and destination each router is connected to its neighbour router in peer to peer manner, the whole channel consists of a number of routers.So some of the channels are used for static routing and some of them are for dynamic routing schemes.Types of Channel AllocationThe different types of channel allocation schemes are as follows −Static channel allocationDynamic channel allocationHybrid channel allocationNow let us discuss dynamic channel allocation.Dynamic channel allocationIn this channel an interface can switch from one channel to another channel frequently. The dynamic ... Read More
In wireless networks, a channel can be allocated between source and destination, and in between source and destination each router is connected to its neighbour router in peer to peer manner, the whole channel consists of a number of routers.So some of the channels are used for static routing and some of them are for dynamic routing schemes.Types of Channel AllocationThe different types of channel allocation schemes are as follows −Static channel allocationDynamic channel allocationHybrid channel allocationNow let us discuss about static channel allocation −Static channel allocationThe process of static channel allocation scheme is explained below in a stepwise manner ... Read More
Let us understand what error control in the computer networks is.Error ControlError control is concerned with ensuring that all frames are delivered to destination possibly in an order.To ensure the delivery it requires three items, which are explained below −AcknowledgementTypically, reliable delivery is achieved using the “acknowledgement with retransmission” paradigm, whereas the receiver returns a special ACK frame to the sender indicating the correct receipt of a frame.In some systems the receiver also returns a negative ACK (NACK) for incorrectly received frames. So, it tells the sender to retransmit a frame without waiting for a timer to expire.TimersOne problem that ... Read More
Network layer is the third layer in the OSI model of computer networking. Packet forwarding including routing through routers and quality of service management are done by the network layer.Nature of the serviceThe transport layer at the host side receives the service provided by the network layer. But the transport layer resides in the hosts while the network layer resides in the subnet.We know the subnet is a collection of routers which consists of only the bottom three layers. Hence, we can say that the service provided by the network layer to the transport layer is more effective, than the ... Read More
Sliding window protocol is a transmission control protocol. To hold the outgoing and incoming packets both the sender and receiver maintains a finite buffer. Every packet sent from the sender side must be acknowledged by the receiver.The sender is maintaining a timer for every packet sent, and any unacknowledged packet in a certain time is resent. The sender will send a complete window of packets before receiving an acknowledgement for the first packet in the window. This leads to a higher transfer rate, as the sender may send multiple packets without waiting for each packet's acknowledgement.The Receiver advertises a window ... Read More
Network delay is defined as how much time will take a bit of data to travel from one node to another node.Network delay can be divided into following ways −Transmission delayPropagation delayLet us learn about both of them in detail.Transmission delayIt is the time required to put a packet’s bit (or data bits) on the transmission medium that can be wired or wireless. Transmission delay depends on the length of the packet and bandwidth of the network.Transmission delay can be calculated as follows −Transmission delay = Packet size / bandwidth packet ... Read More