11_networking classroom slides

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11_networking classroom slides
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A?D
...0110101001010100010101010
Packetizing
10100100
00101010
Packets
11110000
01010101
Reassembly
D?A
001110011001010010101010...
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A?D
111100000010101010100100
Packetizing
10100100
Telephone Infrastructure
00101010
Packets
11110000
Reassembly
D?A
111100000010101010100100
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?Missing Link?
Digital Data
Telephone Infrastructure
Analog Data
Analog Data
?Missing Link?
Digital Data
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Digital Data
Telephone Infrastructure
Analog Data
Analog Data
Digital Data
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Individual computers each with an ethernet
compatible network interface card (NIC).
Ethernet Cable
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Thick Coax Segment 500 Meter Maximum
MAU
AMP Thick Coaxial (Vampire) Tap
15 pin AUI Connector
AUI Cable (50 meter max)
Ethernet Interface
MAU - Medium Access Unit AUI - Attach Unit
Interface
Male "N" Connector 50 ohm terminator
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10-Base-2 Coaxial Ethernet Cable with BNC
terminations
Computer
Terminator
Terminator
BNC "T" Connector
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Hub
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Hub
Hub
Hub
Hub
Hub
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Bridge
Control Logic and Buffers
Network Interface Card
Network Interface Card
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A
B
C
D
Bridge
Port
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MAC address
Message
Payload
Header
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TOKEN
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1. Host wanting to send message must wait for
token
TOKEN
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2. Once token arrives holder of token may send
message
TOKEN
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3.Token is then passed on the next host on ring
TOKEN
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Dormitory LAN
Backbone Network
Dorm Computer
ISP
Home Computer
Routers
All of the networks taken together form the
Internet A network of networks
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Protocol module
Protocol module
pkt1 ack
pkt1
Network
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message
Application layer
Transport layer
pkt1
pkt2
pktn

Routing tables
Network layer
Physical media
Token Ring
Ethernet
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ISO Model
interact with user e.g. mail, telnet, ftp
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char conv., echoing, format diffs endian-ness
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Presentation
Session
Process to process comm. e.g. Unix sockets
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Transport
packetizing, seq-num, retrans. e.g. TCP, UDP
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routing, routing tables e.g. IP
Network
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interface to physical media, error recovery e.g.
retrans on collision in Ethernet
Data Link
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Electrical and mechanical characteristics
of physical media e.g. Ethernet
Physical
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