Basic Concepts. Line Configuration Line Configuration Topology Topology Transmission Mode Transmission Mode Categories of Networks Categories of Networks.

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Presentation transcript:

Basic Concepts

Line Configuration Line Configuration Topology Topology Transmission Mode Transmission Mode Categories of Networks Categories of Networks Internetworks Internetworks

Line Configuration The way two or more communication devices attach to the link The way two or more communication devices attach to the link The link = physical pathway that transfers data from one device to another The link = physical pathway that transfers data from one device to another Point-to-Point Point-to-Point Multipoint Multipoint

Point-to-Point workstation server link

Multipoint server workstation Capacity of the channel is shared spatially shared line several devices can use the link simultaneously time-shared lineusers must take turn

Basic Concepts Line Configuration Line Configuration Topology Topology Transmission Mode Transmission Mode Categories of Networks Categories of Networks Internetworks Internetworks

Topology Topology = the way a network is laid out Topology = the way a network is laid out Physically Physically Logically Logically Mesh Mesh Star Star Tree Tree Bus Bus Ring Ring

Relationship Status Peer-to-peer Peer-to-peer The devices share the link equally The devices share the link equally Primary-secondary Primary-secondary One device control traffic and the other must transmit through it One device control traffic and the other must transmit through it Ring and mesh topology  peer-to-peer transmission Ring and mesh topology  peer-to-peer transmission Star and tree topology  primary-secondary Star and tree topology  primary-secondary Bus  both Bus  both

Mesh Advantages: no shared link, each communication carries its own data load robust – if one link is unusable, there are still other links to use privacy and security fault identification and fault isolation -- easy

Mesh Disadvantages Disadvantages Requires many cables, ports, hardware Requires many cables, ports, hardware N devices require N devices require N(N-1)/2 physical channels N(N-1)/2 physical channels N-1 I/O ports for each device N-1 I/O ports for each device

Star hub Central control Each device needs only one link, one I/O port Easy to install, reconfigure Less cables Fault detection /isolation  easy robust

Tree hub Central control hub (Active hub)

Bus Tap Cable end Tap Drop line backbone

Bus Advantages easy to install less cables Disadvantages fault isolation is difficult difficult to add new devices

Basic Concepts Line Configuration Line Configuration Topology Topology Transmission Mode Transmission Mode Categories of Networks Categories of Networks Internetworks Internetworks

Transmission Mode Defines the direction of signal flow between two linked devices Defines the direction of signal flow between two linked devices Three types Three types Simplex Simplex Half-duplex Half-duplex Full-duplex Full-duplex

Transmission Mode Simplex Simplex Unidirectional, like a one way street Unidirectional, like a one way street Only one device can transmit, the other only receives Only one device can transmit, the other only receives monitor server Direction of data

Transmission Mode Half-duplex Half-duplex Each station can both transmit and receive but not at the same time Each station can both transmit and receive but not at the same time When one device is sending, the other can only receive When one device is sending, the other can only receive E.g. Walkie-talkie E.g. Walkie-talkie Direction of data at time 2 Direction of data at time 1

Transmission Mode Full-duplex Full-duplex Both stations can transmit and receive simultaneously Both stations can transmit and receive simultaneously E.g. telephone network E.g. telephone network Direction of data at the time

Basic Concepts Line Configuration Line Configuration Topology Topology Transmission Mode Transmission Mode Categories of Networks Categories of Networks Internetworks Internetworks

Categories of Networks LAN (Local Area Network) LAN (Local Area Network) MAN (Metropolitan Area Network) MAN (Metropolitan Area Network) WAN (Wide Area Network) WAN (Wide Area Network)

Internetworks Two or more networks are connected Two or more networks are connected