Practical TCP/IP and Ethernet Networking- P12
Mô tả tài liệu
Practical TCP/IP and Ethernet Networking- P12: The transmitter encodes the information into a suitable form to be transmitted over the communications channel. The communications channel moves this signal as electromagnetic energy from the source to one or more destination receivers. The channel may convert this energy from one form to another, such as electrical to optical signals, whilst maintaining the integrity of the information so the recipient can understand the message sent by the transmitter....
Tóm tắt nội dung
As a physical topology, a ring describes a network in which each node is ring until it returns to the node that sent it. In a ring topology, each node can act As you will see later in this chapter, since ring use token passing to control access to the network, the token is returned to sender with the then releases the token to the next node on the this node has nothing to say, the node passes the token on to the next node, and so ring networks are rare, Ring topology • A physical ring topology has minimal cable • Each node can the signal • If any node goes down, the entire ring goes down • Adding or removing nodes disrupts the network � A ring topology, also known as a hub topology, is a hybrid physical topology that combines features of the star and ring network may be connected to other a faulty node from the internal ring. By closing the circuit, the ring remains intact, but with one less node. The IBM token ring networks are the example of a ring token ring The of a ring topology include: The of a ring topology include: �� ���� (� every method, the first node to seek access when the network is idle will be able to The carrier sense component involves a node wishing to transmit a message listening to �� ���� an available token reaches a node, that node can access the network for a maximum time, before passing the token on. This access method that every node will get access to the in contrast to a access method (such as CSMA/CD), in which nodes check for network activity when they want to access the network, and the first node to claim the such networks, nodes using access methods spend much of their time Network that support the token passing access method include To transmit, the node first marks the token as ‘in use’, and then transmits a data packet, In a ring topology network, the packet is passed from node to sending the message back to the sender, who then sends the token on to the next node in In a bus topology network, the next recipient of a token is not the node that is nearest to the current token passing in an ARCnet or token bus network, the token is passed from a node to the node Networks that use token passing generally have A token ring network requires an active monitor (AM) and one or more standby lost, or sent to a node that has been from the network.