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40 Cards in this Set
- Front
- Back
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Switch |
Connects nodes within a single network |
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Router |
Specialized computer that connects one network to another |
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internet |
any arbitrary group of interconnected networks |
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Internet |
Global Internet that connects many networks |
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physical network subnet |
a single network, usually connected to the Internet through a router |
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Hardware/Physical Address |
MAC Address 6 two digit hex numbers A6:45:7C:CC:23:DF |
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Global Address |
Unique across multiple networks IPv4 and IPv6 Normally changes if node is moved |
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Name Address |
URLs Name remains the same even if node is moved |
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Computers on the Internet typically have what addresses? |
Hardware, Global IP If server, also a Domain Name |
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Unicast |
Recepient is a single node |
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Broadcast |
Recevied by all nodes on a network |
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Multicast |
Received by a subset of nodes on a network |
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TDM |
Timed Division Multiplex |
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FDM |
Frequency Division Multiplex |
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STDM |
Statistical Timed Division Multiplex |
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Packet |
Chunk of data with control info in a header Can travel over multiple networks |
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Three types of network failures |
Bit error Lost packet Link failure |
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Bit Error |
A bit value gets changed/lost during transmission Usually due to electrical interference |
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Lost Packet |
Invalid destination address Overloaded switch/router/server |
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Link Failure |
Damaged cables, switch, router, or server Can use alternate path (if available) |
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First Principle of Network Design |
"No undetected errors" |
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Ways to Identify Nodes |
Hardware Address Global Address Name |
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Categories of Addresses |
Unicast Broadcast Multicast |
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Network |
An INFRASTRUCTURE that provides communication between computers |
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Connectivity Meanings |
The ability to communicate The quality of communication |
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Scalability |
the ability for a network to grow "gracefully" No major redesign or replacement of current network |
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Nodes |
Any connectable computation device |
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Links |
the physical medium of connection wire, radio, or fiber optic |
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Direct Link Types |
Point-To-Point Multi-Access |
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Point-to-Point |
Two nodes, one link |
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Multi-Access |
More than two nodes, one link |
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How to calculate number of point-to-point connections needed to connect n devices |
L = N(N-1)/2 |
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Internal Nodes |
Infrastructure devices Hubs, Switches, Routers |
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External Nodes |
Hosts Computer, Tablets, Phone |
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Cloud Symbol in Switched Networks |
"Some sort of network" Where the internal nodes reside |
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Two Models of Switched Networks |
Circuit Switched Packet Switched |
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Circuit Switched |
Traditional discreet-based networks
End-to-End connection must be established before communication can occur Used to be used for telephone systems |
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Packet Switched |
Uses "store-and-forward" process to relay packets from one node to the next, until packet is delivered |
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Source |
Original sender of a data packet |
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Receiver (Sink) |
Ultimate recipient of a data packet |
