Channel Characteristics:
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, Communication channel: Path for the message between two
communicating nodes. May include intermediate nodes that forward
packets to the next node. Interfaces at each end of the connection may be
different.
Links: Segment of a communication channel.
Bandwidth: Bit rate of overall channel.
Medium: Guided communications limited to a specific path. Unguided is
communications not limited to a specific path. Data transmission
directionality: Simplex is messages are carried only in one direction. Half-
duplex is messages are carried in both directions but only one direction at
a time. Full duplex is messages are simultaneously carried in both
directions.
Number of connections: Point-to-point or Multipoint.
End node interfaces: Wired or wireless Ethernet. Bluetooth, DSL, cable,
satellite link, cell phone technologies, etc. Protocols allow interconnection
for data communications capability.
Protocols allow interconnection for data communications capability
Understand what files are:
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File Association: The file specifies which program it is to be used with.
File extension: Name of file includes identification of what type of file it is.
Block: Typically between 256 and 4096 bytes. Files usually require a one-
block minimum.
Cluster: Groups of one or more blocks
System configurations:
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Monolithic systems: provide most of their services within a single operating
system program.
HIERARCHICAL: Each layer is independent of the other layers. Requests
, are passed down to the layer immediately below it. Microkernal: Minimum
essential functionality
Components of an operating system:
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Bootstrap program.
Memory Resident: OS programs always loaded in memory. Commonly
called the kernel. Typically responsible for managing memory, processes
and tasks, and secondary storage. Contains essential services required by
other parts of the operatingsystem and applications.
Memory Non-resident: Commands, Software tools, and Infrequently used
programs
Logical view vs Physical View:
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Logical view: contents and attributes of files viewed by the user.
Physical view: the actual way a file is stored within the computer system
Types of operating systems:
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, Communication channel: Path for the message between two
communicating nodes. May include intermediate nodes that forward
packets to the next node. Interfaces at each end of the connection may be
different.
Links: Segment of a communication channel.
Bandwidth: Bit rate of overall channel.
Medium: Guided communications limited to a specific path. Unguided is
communications not limited to a specific path. Data transmission
directionality: Simplex is messages are carried only in one direction. Half-
duplex is messages are carried in both directions but only one direction at
a time. Full duplex is messages are simultaneously carried in both
directions.
Number of connections: Point-to-point or Multipoint.
End node interfaces: Wired or wireless Ethernet. Bluetooth, DSL, cable,
satellite link, cell phone technologies, etc. Protocols allow interconnection
for data communications capability.
Protocols allow interconnection for data communications capability
Understand what files are:
Give this one a try later!
File Association: The file specifies which program it is to be used with.
File extension: Name of file includes identification of what type of file it is.
Block: Typically between 256 and 4096 bytes. Files usually require a one-
block minimum.
Cluster: Groups of one or more blocks
System configurations:
Give this one a try later!
Monolithic systems: provide most of their services within a single operating
system program.
HIERARCHICAL: Each layer is independent of the other layers. Requests
, are passed down to the layer immediately below it. Microkernal: Minimum
essential functionality
Components of an operating system:
Give this one a try later!
Bootstrap program.
Memory Resident: OS programs always loaded in memory. Commonly
called the kernel. Typically responsible for managing memory, processes
and tasks, and secondary storage. Contains essential services required by
other parts of the operatingsystem and applications.
Memory Non-resident: Commands, Software tools, and Infrequently used
programs
Logical view vs Physical View:
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Logical view: contents and attributes of files viewed by the user.
Physical view: the actual way a file is stored within the computer system
Types of operating systems:
Give this one a try later!
