cisco networking academy chabot college elec 99.08 wide area network introduction
TRANSCRIPT
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
Chabot CollegeChabot College
ELEC 99.08ELEC 99.08Wide Area Network Introduction
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
WANsWANs
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
WAN TechnologiesWAN Technologies
Data Link Layer
Physical Layer
Network Layer
Session Layer
Transport Layer
Presentation Layer
Application Layer
WAN technologies
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
Physical and Data LinkPhysical and Data Link
Layer 2
Layer 1
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
WAN: Layer 1WAN: Layer 1
WAN physical layer protocols describe how to provide connections.
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
The WAN interfaceThe WAN interface
Your Ethernet LAN connects to your router. But what does you router connect to?
802.3 LAN ? WAN
Cat5 UTP
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
Regional Bells Provide MediaRegional Bells Provide Media
PACBELL
Regional Bells usually provide the media for Wide-Area Network connectivity.
SF NY
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
WAN PipesWAN Pipes
More….
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
The WAN interfaceThe WAN interface
How do routers connect to the phone companies lines?
to phone company
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
Data Terminal EquipmentData Terminal Equipment
Routers are usually considered DTEs. DTEs are devices at the end of a user’s network that serve as a data source, destination, or both.
The router is a DTE, or Data Terminal Equipment
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
Data Terminal EquipmentData Terminal Equipment
Your home computer can also be a DTE.
How do you connect to the phone company’s network at home?
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
to phone company
modem
DTEs and DCEsDTEs and DCEs
At home, you connect to the phone company’s network using a modem.
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
Data Circuit EquipmentData Circuit Equipment
A modem is a type of DCE, or Data Circuit-Termination Equipment. It’s the device at the end of the service provider’s network (phone company).
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
Data Circuit EquipmentData Circuit Equipment
• Another type of DCE is a CSU/DSU– Channel Service Unit– Data Service Unit
• CSU/DSU is located at the end of the service provider’s network (phone company).
• connects to router Serial port.
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
Customer’s Network
Phone Company’s
Network
DTEs and DCEsDTEs and DCEs
A DTE interfaces with a DCE to gain access to the phone company’s network.
DTE DCE
PCPCRouterRouter
ModemModemCSU/DSUCSU/DSU
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
DTEs and DCEsDTEs and DCEs• Router to CSU/DSU connection:
– Serial port on router– V.35 port on CSU/DSU – V.35 Cable between
CSU/DSU
DCEDTE
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
phone company
digital line
CSU/DSU
DTEs and DCEsDTEs and DCEsTypical WAN configuration:
CSU/DSU
DCE DCE
HaywardOakland
DTE DTE
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
DTEs and DCEsDTEs and DCEsOur Lab’s unusual configuration:
No digital phone lines, no CSU/DSUs.
The WAN is simulated in our lab.
Therefore, one router must play the DCE role - very unusual.
Serial interface Serial interface
V.35 CablesBack-to-Back
HaywardOakland
DTE DCE
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
WAN: Layer 2WAN: Layer 2
WAN data-link protocols describe how frames are carried between systems on a single data path.
– point-to-point
– multipoint
– multiaccess (Frame Relay)
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
WAN at Layer 2WAN at Layer 2
dedicated
switched
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
Data Link Layer: WAN ProtocolsData Link Layer: WAN Protocols
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
HDLCHDLC
High-level Data Link Control– usually used when connecting one router directly
to another (point-to-point)
– also is capable of supporting multipoint connections (multiple point-to-point) (test question)
– requires dedicated private digital lines
– HDLC implementations are proprietary
– Cisco serial interfaces default to HDLC
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
PPPPPP
Point-to-Point Protocol– used in point-to-point dedicated connections
– used by
• routers over dedicated digital lines
• POTS users over dial-up (circuit switched) lines (Windows & Mac dial-up networking)
– descendant of SLIP
– open standard (RFC 1661)
– allows authentication (PAP, CHAP)
– allows multiple layer 3 protocols
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
Frame RelayFrame Relay
Frame Relay– packet switched
– private dedicated digital lines not required
– one physical link can handle multiple logical links - (multiaccess)
– descendant of X.25
– simplified frame (no error correction) relies on today’s superior data links
– very fast
– cheap: pay for what you use
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
ISDNISDN
Integrated Services Digital Network– circuit switched - (over digital voice/data line)
– designed to transmit voice, data, video over existing phone lines
– used primarily for remote access via modems
– not very fast (especially BRI - 128 Kbps)
– may disappear with the emergence of cable modems and DSL
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CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
WAN Technology Options WAN Technology Options