Cisco - Branch Based Network Architecture 1401

1401 1026_05F9_c1

1

© 1999, Cisco Systems, Inc.

Branch-Based Network Architecture Session 1401

1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

2

1

Objective

Provide the key factors to design a cost-effective, branch-based network

1401 1026_05F9_c1

3

© 1999, Cisco Systems, Inc.

Agenda

1401 1026_05F9_c1

• • • • • • • •

Introduction Network Design Routing and Switching Scalability Security Management Examples Q&A

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

4

2

Agenda

1401 1026_05F9_c1

• • • • • • • •

Introduction Network Design Routing and Switching Scalability Security Management Examples Q&A 5

© 1999, Cisco Systems, Inc.

Some Typical Customer Examples

• Retail • Financial • Hospital • Government 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

6

3

Banking Example • Automatic teller machines

PBX

• Transactions • Branch alarm systems • E-mail • Main branch call centers 1401 1026_05F9_c1

or ATM ATM (SDLC) (SDLC)

Alarm

© 1999, Cisco Systems, Inc.

7

Application Examples • Terminal emulation • Enterprise Resource Planning (ERP) • Transaction and DB (checking, transfers, ATM, and queries) • Mail and file transfer • Web integration • Patient care 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

8

4

Technology Evolution Mainframe

Mainframe

Mainframe

CIP

Server

37X5

3745

Front End Processor

Terminal Controller

NPSI

X.25

Modems

Gateway PAD

Frame Frame Relay Relay

X.25 PAD

PAD

SMDS ATM

Cluster Control

Local Access

SDLC

Cluster Control

Cluster Control

Token Ring

3174

Async Terms

Client

Async 12/2400 Leased Bisync 1401 1026_05F9_c1

Leased SDLC Multidrop

X.25 Usage Based Local Dial-Up

Frame Relay, ISDN ATM, SMDS, XDSL 9

© 1999, Cisco Systems, Inc.

Today’s Multiservice Networks Order Language Config Language

Partner1

SDH/ATM/FR Backbone

Internet

ATM, Frame Relay, IP, Voice Services

Multiple Access Technologies Cable ADSL D/C

D/C

Frame ATM FUNI

ISDN POTS

Mobile

Wireless ATM 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

10

5

Network Evolution Applications Application Resource Controls

Security Controls

Transport Services Applications Manageability Controls

Transport Services

1401 1026_05F9_c1

11

© 1999, Cisco Systems, Inc.

Component Class 7 6

Network Application Services

5

Firewalls

DNS/DHCP Policy Servers

4

Transport Router

3

Network

2

Data Link

1

Physical

LAN Switch

FR/ATM Switch

Bridge Stat Mux

Multiplexer

Hub 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

12

6

Routers Multiple Protocols

Multiple Media Ethernet

IP

OSI SDLC Banyan

Novell

Private 19.2, 56, 64 kbps T1, E1, T3, E3

Token Ring

Circuit POTS, BRI, PRI Sw 56, H0, T1, T3

AppleTalk NetBIOS

FDDI

XNS SMDS DECnet ISDN Frame SRB Relay X.25

Packet X.25, Frame Relay SMDS, ATM

1401 1026_05F9_c1

13

© 1999, Cisco Systems, Inc.

Definition of a Flow • Traffic generated from a source to a destination • Depending on the protocol, traffic from sourcedestinationsource may be asymmetric or symmetric 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

14

7

Know Your Flows • Application and network bandwidth • Batch and burst requirement Application packet size Application priority Latency Transactions/packets New York per second 512 Kbps Port • Packet destination type: unicast, multicast or broadcast • Congestion behavior • Data size and overhead • • • •

1401 1026_05F9_c1

Boston 256 Kbps Port Dallas 128 Kbps Port Atlanta 128 Kbps Port

© 1999, Cisco Systems, Inc.

15

Traffic Definition Types

• Unicast (one to one only) • Multicast (one to many) • Broadcast (one to all)

1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

16

8

Multicasting Data Is Replicated at the Last Possible Point by the Network

• Saves bandwidth • Permits simultaneous replication • Offloads sending host • Creates trees and branches • Requires address management 1401 1026_05F9_c1

17

© 1999, Cisco Systems, Inc.

Application Example: Voice Compression Unacceptable

64

Business Quality

Toll Quality

(Cellular)

* PCM

Bandwidth (Kbps) * ADPCM 32 (G.723)

32 24 16 8

* ADPCM 24 (G.725) * * ADPCM 16 (G.726) LDCELP 16 (G.728) * * LPC 4.8 CS-ACELP 8 (G.729)

0 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

Quality 18

9

Agenda

1401 1026_05F9_c1

• Introduction • Network Design • Routing and Switching • Scalability • Security • Management • Examples • Q&A 19

© 1999, Cisco Systems, Inc.

Network Design Criteria • Bandwidth management QoS, compression, bandwidth on demand, tariff management, capacity planning

• Security Authentication, encryption, firewall

• High availability Redundancy, backup

• Scalability

Qos Compression Bandwidth on Demand Tariff Management Authentication Encryption Firewall Redundancy Backup Hierarchical Design Network Management

Hierarchical design

• Manageability 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

20

10

Hierarchical Network Design

• Core • Distribution • Access Best Way to Design for Scalability and Manageability 1401 1026_05F9_c1

21

© 1999, Cisco Systems, Inc.

WAN Hierarchical Logical Design Central

Fully Redundant Efficient Traffic Forwarding

WAN Core FR,ATM, T3/E3,T1/E1 Regional

Route Summarization Use Separate Areas/ A.S. SAP Filtering Enable BW Features

Core

Regional Regional

Branch Branch Branch Branch Branch Branch Branch Branch

Branch Branch

Distribution

Branch

Static or Default Routes Compression

SOHO SOHO SOHO

SOHO

SOHO 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

Mobile Mobile Mobile

Access

Mobile

Mobile 22

11

Core

• High speed for traffic forwarding • Keep it simple, but redundant • Not oversubscribed • Don’t fully mesh—more complex and inefficient 1401 1026_05F9_c1

23

© 1999, Cisco Systems, Inc.

Distribution • Access aggregation and oversubscription • Address summarization for dedicated and backup lines (ISDN, dial, etc.)

Core

Distribution

• Limit number of access lines/PVCs per router • Know your flows in order to provision backbone uplinks and access links • Bandwidth management 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

24

12

Access Core

• Bandwidth management (QoS, compression • Services • Media encapsulation and conversion (X.25, STUN, SNA, 1401 1026_05F9_c1

Access ATM

25

© 1999, Cisco Systems, Inc.

Topology Design

• Star topologies • Fully-meshed topologies • Partially-meshed topologies

1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

26

13

Start Topologies

• Advantages: Simple management and tariff costs

• Disadvantages: Core router limits performance, single point of failure and not scalable 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

27

Fully-Meshed Topologies

• Advantages: High redundancy and supports all net protocols

• Disadvantages: Large number of VCs, large number of packet/broadcast replication 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

28

14

Partially-Meshed Topologies

• Combination of full and star topology • Best mix to provide scalability, limited number of VCs, redundancy and performance 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

29

Broadcast/Multicast Issues • Multicast is treated as broadcast in packet based nets • Broadcast/multicast need to replicate over every VC on a physical line • Different levels of broadcast with different protocols Broadcast/Multicast Scalability and Performance Will Vary Based on Topology and Media Selection 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

30

15

Some WAN Connectivity Options Leased Line

Frame Relay

ATM

56kbps and Above

56kbps to T3/E3 kbps

T1/E1 and Above

Variable Performance

Bandwidth Flexibility

More Performance Management

Cell Overhead

Lowest Cost

Highest Bandwidth/$

Optimizes Speed Minimizes Variable Performance Easier Management Highest Cost 1401 1026_05F9_c1

Cloud Redundancy

© 1999, Cisco Systems, Inc.

31

The Internet Protocol (IP)

1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

32

16

SNA, DECnet, AppleTalk…

• Legacy protocols • Still have many applications in use today • Ships in the night or encapsulated in another protocol (I.e., SNA over IP) • All use bridging or proprietary routing protocols 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

33

Integrating Legacy into IP • Permits legacy protocols only where required • Any to any host communication • Reduces complexity of design and operations in the core and distribution • Uses efficient IP routing protocols for high availability • Uses more cost-effective IP tools 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

34

17

Addressing

5.1

1.2 1.1 FDDI

Network 4

1.3 3.1

Network 1 3.2

2.2 2.1

2.3 FDDI

4.1 3.4

5.3 4.2

Token Ring Network 3 3.3

5.2 5.4

Network 5

Network 2

1401 1026_05F9_c1

35

© 1999, Cisco Systems, Inc.

Addressing Issues Efficient use of address space Growth Ease of administration Address efficiency vs. routing efficiency (summarization) • Static vs. dynamic addressing • Each routing/network protocol uses its own scheme (IP, IPX, DECnet) • • • •

1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

36

18

Queuing Comparison

• FIFO queuing • Weighted-fair queuing • Priority queuing • Custom queuing Critical for Multiservice Traffic 1401 1026_05F9_c1

37

© 1999, Cisco Systems, Inc.

Agenda

1401 1026_05F9_c1

• Introduction • Network Design • Routing and Switching • Security • Scalability • Management • Examples • Q&A © 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

38

19

The Basics Routing and Switching

• What Is Routing? • What Is Switching? • OSPF

• Packet Forwarding

• BGP

• Layer 3 Switch

1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

39

Router/Switch Functions

• Routing = building maps and giving directions • Switching = moving packets between interfaces 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

40

20

Routing Protocol Goals • Optimal path selection • Loop-free routing • Fast convergence • Limited design administration • Minimize update traffic • Scalable—support hierarchical topology • Easy to configure 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

41

Routing Protocol Choices • Static routes • Dynamic Internal Gateway Protocols (EIGRP, OSPF, RIPv1, RIPv2, etc.) External Gateway Protocols (BGP4) Multicast (PIM, DVMRP, mBGP)

• On-Demand Routing (ODR) 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

42

21

When to Use OSPF • Required dynamic routing • Hierarchical networks • Address aggregation • Fast convergence • No periodic updates—efficient for low-speed WANs The Best for Designing a New Network, Requires a Hierarchical Design 1401 1026_05F9_c1

43

© 1999, Cisco Systems, Inc.

On-Demand Routing • Hub-spoke model • Hub dynamically maintains routes • No routing protocol required in stub

Dynamic Routing Protocol

PSTN ISDN

ODR

• Works well when only limited access or nondedicated links 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

44

22

BGP for External Connectivity Peering

AS 100

A

C

B

D

AS 101

E

AS 102

• NOT an IGP, external gateway protocol • Incremental update 1401 1026_05F9_c1

45

© 1999, Cisco Systems, Inc.

When to Use BGP • Connecting to external entities owned or operated by you (other AS) • Only require connectivity information for best optimal path decision • Keeps internal routing information separate from external routing information

Use It when You Have Multihomed Internet or Partner Connections 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

46

23

Agenda

1401 1026_05F9_c1

• Introduction • Network Design • Routing and Switching • Scalability • Security • Management • Examples • Q&A 47

© 1999, Cisco Systems, Inc.

Scalability • Performance • Growth and new applications • Media costs • Traffic flows and geographic concentration • Bandwidth efficiency • Load distribution and balancing 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

48

24

Understanding Vendor Thresholds

• Hardware and/or software architectures and configurations vary • Often less than media speed for one or more interfaces in network device • Work with vendor to understand limitations, threshold behavior, and tuning capabilities 1401 1026_05F9_c1

49

© 1999, Cisco Systems, Inc.

High Availability • Understand application performance and timeouts • Queuing and flow control mechanisms (transport and application-based) • Redundancy and load balancing issues (if possible to implement and how) • Fast network convergence (level 2 or 3) 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

50

25

Scalability and Redundancy for Servers • Redundant servers (clusters) • Traffic director (centralized) • Distributed director (distributed) • Content caching • Replication and multicasting of contents 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

51

Application Scalability

• Know the applications and flows • Test with developers for LAN and WAN testing (Ethernet, Frame Relay and Dial) • Test redundancy and high availability • Understand chatter 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

52

26

Agenda

1401 1026_05F9_c1

• Introduction • Network Design • Routing and Switching • Scalability • Security • Management • Examples • Q&A 53

© 1999, Cisco Systems, Inc.

Security Issues

• What is my corporate security policy? Traffic issues Operational issues (network equipment configuration and service denial) What is your sensitive data? What is your cost of loss of data or service? How do I verify my security policy? 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

54

27

Security AAA Server

Customer Network

ACL

HQ Network

ACL

Authenticated/Encrypted Connection Firewall Authenticated/ Encrypted Tunnel

NMS

NAS

1401 1026_05F9_c1

ACL

Internet

NetFlow Collector AAA Server

© 1999, Cisco Systems, Inc.

55

Network Configuration • Password enabled or AAA for remote access and 16 levels of administrators • Directory services • Authentication for routing exchange • Filtering authorized NOC stations • Firewalling services and NOC • Logging and reporting 1401 1026_05F9_c1

• Active audits © 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

56

28

Agenda

1401 1026_05F9_c1

• Introduction • Network Design • Routing and Switching • Scalability • Security • Management • Examples • Q&A 57

© 1999, Cisco Systems, Inc.

Administration • Configuration management • Change management • Inventory management • Provisioning • Policy management • Capacity planning 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

58

29

Operation

• Directory services • Logging and data collection • Availability management • SLA monitoring and reporting • Fault management 1401 1026_05F9_c1

59

© 1999, Cisco Systems, Inc.

Agenda

1401 1026_05F9_c1

• Introduction • Network Design • Routing and Switching • Scalability • Security • Management • Examples • Q&A © 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

60

30

Examples

• Banking • Financial • Retail

1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

61

Banking Applications • Automatic teller machines SDLC, bisync, security video

• Transactions Deposits, wire, foreign exchange

• Branch alarm systems • E-mail • Main branch call centers 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

62

31

Banking Requirements

• Availability • Security • Multiprotocol • QoS 1401 1026_05F9_c1

63

© 1999, Cisco Systems, Inc.

Banking IP Transport 7200/7500

At Central Site Redundant Routers (HSRP) VoIP Termination Router ISDN/Dial Backup

PBX 3640

WAN Connect Options

IP

ISDN/Dial

Frame Relay: Multi VCs Leased Line ISDN (Backup)

CRTP WFQ

CQ

Voice/PBX Video SDLC or BSC LAN

WRED

or ATM ATM (SDLC) (BSC) 1401 1026_05F9_c1

Alarm

IP Precedence

3600

CAR

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

64

32

Banking WAN Switched ATM, FR, Leased IGX 8400 AutoRoute PBX

OptiClass ForeSight

ATM/FR

or

ATM/FR/ Leased

Alarm

ATM ATM (SDLC) (SDLC)

MC3810 1401 1026_05F9_c1

Use ATM or Leased to Interconnect Multiple IGX Concentrators, Using Public FR Will Mean No AutoRoute; up to 255 Remote Connections per IGX 8400 WAN Connect Options MultiFlex Trunk: ATM Mode MultiFlex Trunk: Channelized Serial Port: Public FR Serial Port: Leased Serial Port: PPP (No Voice) Voice/PBX Video SDLC LAN

© 1999, Cisco Systems, Inc.

65

Financial: Applications

• Stock trading—traditional • Stock trading—Internet • Stock ticker services (RT) • Securities exchange • Confirmations desk 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

66

33

Financial: Requirements • Security • Redundancy (high availability) • Predictable and low delay • Multicast • High BW • QoS to offer different service levels 1401 1026_05F9_c1

67

© 1999, Cisco Systems, Inc.

Financial: Designs Confirmations Desk

Multicast

Firewall

A

HSRP

B PBX

Internet Redundant Connections

HSRP

Web Servers

Branch Home/Remote Trading

NASDAQ 1999 +100 CSCO 99.9 +5 NASDAQ 1999 +100 CSCO 99.9 +5

Foreign Offices

Trading Floor

Ticker Services 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

68

34

Health Care: Applications • Electronic medical records Textual/multimedia; capture, track, archive, retrieve

• Teleradiology Filmless imaging system; capture, track, archive, retrieve

• Telemedicine (distant patient care) Remote diagnosis/surgery Specialist to specialist consultation

• Continuing education 1401 1026_05F9_c1

69

© 1999, Cisco Systems, Inc.

Health Care: Requirements

• Security • Bandwidth • Redundancy • QoS RSVP, WFQ, IP precedence 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

70

35

Health Care: Designs MA GN

EMR Server Admin/ Finance

Dry Process Print

PBX CRTP

Nurse Call Center

MRI Center

Storage Archive Array Station PSTN ISDN

RSVP

Home Health

WFQ

Kidney Dialysis Center

IP Precedence

Partner Facility

Clinic Physician Radiologist Office Office Remote Clinic

1401 1026_05F9_c1

71

© 1999, Cisco Systems, Inc.

Retail

PBX

Central Site or Corp HQ

Backup Site

Redundant Routers (HSRP) Voice Termination Router High Speed Backup

Redundant Routers (HSRP) Voice Termination Router High Speed Backup

Regional Site or Store

ISDN/Dial

Point of Sale

Local Database Server

Store or Outlet Voice/PBX Video LAN

Alarm

1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

Redundant Routers Voice Termination Router Multiple Computer Site Connectivity

WAN Connect Options Frame Relay, ATM, VPN Leased Line POTS or ISDN (Backup) 72

36

Agenda

1401 1026_05F9_c1

• Introduction • Network Design • Routing and Switching • Scalability • Security • Management • Examples • Q&A 73

© 1999, Cisco Systems, Inc.

References

• “Internetworking Design Basics” and “Designing Packet Services” on CCO • Technology and products sessions for : WAN, Access, Cisco IOS, Security, Voice, Network Management and General 1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

74

37

Objective

Provide the key factors to design a cost-effective, Branch-based network

1401 1026_05F9_c1

75

© 1999, Cisco Systems, Inc.

Please Complete Your Evaluation Form Session 1401

1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

76

38

1401 1026_05F9_c1

© 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr

77

39