The document discusses methods for prototyping remote connectivity and WAN connectivity, including using simulation software, simulated links in a prototype lab, and pilot testing. It describes prototyping a Frame Relay WAN connection using Cisco routers and validating choices of WAN devices, topologies, and VPN technologies to meet business and technical requirements. The prototype tests remote worker VPN connectivity using Cisco EasyVPN and validates the placement of the VPN server and access filtering.

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Prototyping the WAN
Designing and Supporting Computer Networks – Chapter 8

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Objectives
 Describe the methods to prototype remote
connectivity support
 Prototype the WAN Connectivity
 Prototype the VPN connectivity for remote workers

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Describe the Methods to Prototype Remote
Connectivity Support
 Simulation software
 Prototype testing using simulated links
 Pilot testing in the actual environment

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Describe the Methods to Prototype Remote
Connectivity Support
Benefits of using simulation software to test remote
connectivity:
 Lower overall cost
 Flexibility
 Scalability
 Control

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Limitations of using simulation software to test the
design:
 Limited functionality
 Unrealistic performance
Describe the Methods to Prototype Remote
Connectivity Support

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Describe the Methods to Prototype Remote
Connectivity Support
Simulate WAN connectivity in a prototype lab:
 Use Ethernet connection to simulate DSL or cable
 Use CSU/DSU, serial modems, or V.35 cables to
simulate serial connectivity

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Prototype the WAN Connectivity
 Identify business goals and technical requirements from
the case study and determine which of these goals and
requirements can be tested in the prototype

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Prototype the WAN Connectivity
 Create a success criteria checklist to support business
goals and technical requirements

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Determine the elements of the simulated WAN
connection:
 Simulate the Frame Relay connection using a Cisco
router acting as a Frame Relay switch
 Simulate a crossover function using V.35 cables
 Provide the DCE function with a clock rate
Prototype the WAN Connectivity

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Prototype the WAN Connectivity
Validate the choice of WAN devices and topologies:
 Local point-to-point circuit
 Packet-switched network
 Remote point-to-point circuit

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Prototype the WAN Connectivity
 Configure the router to act as the Frame Relay switch
 Configure serial interfaces as DCE devices
 Configure Layer 3 addresses and encapsulation type

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Prototype the WAN Connectivity
Verify that the Frame Relay WAN operates as expected:
 Display the status of the interfaces
 Verify the exchange of LMI messages
 Display the status of PVCs and the Frame Relay maps

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Provide and test backup capabilities:
 Set up Ethernet connections
 Create floating static routes
Prototype the WAN Connectivity

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Prototype the WAN Connectivity
 Troubleshoot Layer 1 using the show interface serial
command
 Troubleshoot Layer 2 using the show frame-relay lmi
command
 Check Layer 3 functionality

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Prototype the WAN Connectivity
 Identify areas of risk and weakness in the design

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Prototype the VPN Connectivity for Remote
Workers
Determine which business goals and technical
requirements can be tested in the prototype:
 VPN security
 VPN server location

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Prototype the VPN Connectivity for Remote
Workers
 Create a success criteria checklist to support business
goals and technical requirements

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Prototype the VPN Connectivity for Remote
Workers
 Verify the use of Cisco EasyVPN to configure a VPN
server and set up the client software

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Prototype the VPN Connectivity for Remote
Workers
 Validate the choice of VPN technology, devices, and
topologies

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Prototype the VPN Connectivity for Remote
Workers
Prototype the Remote Worker Support:
 IPSec
 Split tunnels

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Prototype the VPN Connectivity for Remote
Workers
 Validate the placement of the VPN server and access
list filtering in the prototype network

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Prototype the VPN Connectivity for Remote
Workers
 Identify risks or weaknesses in the VPN design

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Summary
 Every Frame Relay link has three components: a local
point-to-point circuit, the packet-switched network, and
a remote point-to-point circuit.
 Frame Relay is a nonbroadcast multi-access protocol.
 One way to configure routers to use a backup link when
a primary link fails is to create floating static routes.
 VPNs have two important components: tunneling and
encryption.
 Encryption algorithms such as DES require a
symmetric, shared secret key.
 IPSec provides data confidentiality, integrity, and
authentication at Layer 3.

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