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Copyright © 1997 Cisco Systems, Inc.
6-17CSE: Networking Fundamentals — WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
DSL
“Modem”
End User
DSL
“Modem”
DSL
• DSL is a pair of “modems” on each end of a copper wire pair
• DSL converts ordinary phone lines into high-speed data conduits
• Like dial, cable, wireless, and T1, DSL by itself is a transmission
technology, not a complete end-to-end solution
• End-users don’t “buy” DSL, they “buy” services, such as high-
speed Internet access, intranet, leased line, voice, VPN, and video
on demand
• Service is limited to certain geographical areas
Copper Loop
Ethernet ATM
Digital Subscriber Line (xDSL)
Digital Subscriber Line (xDSL)
Server
Corporate
Network
6-18CSE: Networking Fundamentals — WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
Asynchronous Transfer Mode
(ATM)
• Technology capable of transferring voice, video, and
data through private and public networks
• Uses VLSI technology to segment data, at high
speeds, into units called cells
– 5 bytes of header information
– 48 bytes of payload
– 53 bytes total
• Cells contain identifiers that specify the data stream
to which they belong
• Capable of T3 (44 Mbps), E3 (34 Mbps), and SONET
transmission speeds (OC-1 at 51.84 Mbps to OC-12+)
• Primarily used in enterprise backbones or WAN links
DataDataHeaderHeader
55
4848
- Introduction 1
- WAN Devices 2
- WAN Terminating Equipment 2
- Circuit Switching 3
- Packet Switching 3
- WAN Virtual Circuits 4
- WAN Protocols 4
- Transmission 5
- Transmission Options or WAN 6
- Services 6
- POTS Using Modem Dialup 6
- Integrated Services Digital 7
- Network (ISDN) 7
- Leased Line 8
- Frame Relay 8
- Asynchronous Transfer Mode 9
- Wide-Area Network 10
- Requirements 10
- Manage Bandwidth to 11
- Control Cost 11
- Dial-on-Demand Routing 11
- Compression 12
- Dial Backup 13
- Fundamentals 14
- Routing 14
- Routing Requirements 15
- Routing Information 15
- © 1999, Cisco Systems, Inc 16
- Routing Decisions 17
- RIP Routing Metrics 17
- IGRP Routing Metrics 18
- Routers Forward Traffic 18
- EIGRP Convergence 20
- OSPF Convergence 20
- IP Addressing 21
- Issues with IP Addressing 22
- IP Addressing Solutions 22
- Subnetting Overview 23
- IP Address Classes 23
- Virginia? 24
- What Is Route 25
- Summarization? 25
- Cisco Router 26
- Architecture 26
- Routers (Operationally) 27
- Cisco Family of 27
- Cisco 800 Series 28
- Cisco 1000 Series 28
- Cisco 1600 Series 29
- Cisco 1700 Series 29
- Cisco 2500 Series 30
- Cisco 2600 Series 31
- Cisco 2600 Modules 32
- Cisco 3600 Series 32
- Cisco 3600 Modules 33
- AS5x00 Series 33
- Cisco 4000 Series 34
- Cisco 4500/4700 Modules 34
- Cisco 3600 and 4000 35
- Positioning 35
- Cisco Core Router Platforms 35
- Cisco 7500 Series 36
- VIPs and Port Adapters 37
- VIP2 Models 37
- Cisco 7200 and 7500 Network 38
- Interfaces 38
- Scalable Feature 38
- Performance 38
- Cisco 12000 Series GSR 39
- Enterprise WAN Family 39
- Cisco IOS 40
- IP Network Services 40
- Example: Audio Streaming 41
- Infrastructure 43
- Applications 43
- Traffic Is Grouped into SLAs 45
- Step 1: Identify Traffic and 46
- IP Packet 47
- When there is 48
- Benefits: 50
- Cisco’s Complete Network 52
- Security Solutions 52
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