Transcript VKSF 342 Internetworking Lab

Two Ways to Think About Connected
Systems
• Architectures and Connections
• Architectures range from fully centralized
to fully distributed. Centralized are typically
master-slave connections while distributed
are typically multiple access peer to peer.
• Somewhere in the middle is the clientserver paradigm.
Centralized vs. Distributed
• Advantages of each
• Disadvantages of each
Relationships Between Computers
• Master-Slave
– one is in control, one does what it is told
• Client-Server
– both are autonomous
– server provides some 'service' or resource to the
client
• Peer-to-Peer
– both are equals
Line Configurations
• Line configuration – the way in which two
or more devices attach to a link
• Link – physical path over which data is
transferred
• Types of Line configurations
– Point to Point
– Multipoint
POINT TO POINT
LINK
LINK
LINK
MULTIPOINT LINE
TOPOLOGY
• Topology
– Physical configuration of connection of devices
– Example topologies
•
•
•
•
•
•
Mesh
Star
Tree
Bus
Ring
Hybrid
TRANSMISSION MODES
• Defines direction of information flow
• Types of transmission modes
– Simplex
– Half Duplex
– Full Duplex
HALF DUPLEX
Single, shared physical medium
Information can flow in either direction
Information flows in one direction only at a given
time.
FULL DUPLEX
Two independent channels (physical media)
Information flow in both directions simultaneously
RS232C
DTE
Generates
Data
DCE
Converts to
transmission
media/ converts
to generated data
(Network)
DCE
Converts to
transmission
media/ converts
to generated data
DTE
Receives
Data
RS232C
 25
pins assignments
RS232C – DB9
1 - carrier detect
6 – DCE ready
2- Receive
7 – RTS
3 – Transmit
8 – CTS
4 – DTE ready
9 – Ring Indicator
5 - SG
Null Modem
Null Modem