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network consists of two or more computers that are linked in order to share resources (such as printers and CDs), exchange files, or allow electronic communications. The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams.

Interconnection of a set of devices capable of communication
• Host
• Connecting Device

Network Criteria

The major criteria that a Data Communication Network must meet are: Performance. Consistency. Reliability

A network must be able to meet a certain number of criteria:
• Performance
 Throughput
 Delay
• Reliability
• Security

Physical Structures

physical structure – Dictionary definition and meaning for word physical structure. (noun) the entire structure of an organism (an animal, plant, or human being) Synonyms : body , organic structure. he felt as if his whole body were on fire.

Physical Network Attributes
• Link
• Type of Connection
 Point-to-Point
 Multipoint

Physical Topologies

The physical topology is the way you physically lay out the network, like a map, and the logical topology is the way the information flows on the network. Usually, thephysical and logical topology is the same, but sometimes they can differ, such as in aphysical star/logical ring topology

  • Physical Layout of Network
  • Links + Nodes = Topology
  • Physical Topologies:
  • Mesh
  • Star
  • Bus
  • Ring

Mesh Topology

Star Topology

Bus Topology

Ring Topology

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