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Networking and Internetworking Devices
ดร. อนั�นัต์� ผลเพิ่ �มAnan Phonphoem, Ph.D.
http://www.cpe.ku.ac.th/~anan
Computer Engineering Department
Kasetsart University, Bangkok, Thailand
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Outline Network Devices
Repeater/Hub/Bridge/Router/Gateway Backbone Network
Bus/Star/VLAN
Connecting Devices
Networking Devices
Repeaters Bridges
InternetworkingDevices
Routers Gateways
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Connecting Devices
Hub
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Repeater
• Extend the physical length• No network function has been changed• Location is matter
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Function of repeater
Repeater is not exactly as same as Amplifier
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Hub
• Actually is a multiport repeater• Star / Tree Topology
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Bridge
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Bridge Divide a large network into smaller
segment Isolating and controlling the link
problems (e.g. congestion) Regenerate signal + Checking
Physical Address and forward only to the specified segment
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Function of a bridge
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Multiport bridge
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Routers
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Routers in an internet
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Routers Act like stations on a network Multi-home Definition (Goal)
“Learning how to get from here to there."
“Process of discovering, selecting, and employing paths from one place to another (or to many others) in a network” [from David M. Piscitello, Bellcore and A. Lyman Chapin, BBN]
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Routing Principle Goal: Arriving at the
destination Considerations:
Direct route (shortest) Reliable route Cheap route Safe route Scenic route
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Gateways (protocol converter)
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A gateway
SNA network (IBM)Netware network (Novell)
Connecting Devices
Networking Devices
Repeaters Bridges
InternetworkingDevices
Routers Gateways
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Other devices Multiprotocol routers Brouters Switches Routing switches
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Single VS. Multiprotocol router
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Brouter
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Backbone Network
Bus Backbone
Star Backbone
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Connecting Remote LAN
A point-to-point link acts as a LAN in a remote backbone connected by remote bridges
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Virtual LAN (VLAN)
VLANs create broadcast domains
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VLAN with backbone switch
