8.4 Best Practice in WAN Design Flashcards
In WAN design, the network designer is buying __________ from provider companies rather than buying products
services
Dedicated-Circuit Services:
- T Carrier
- SONET
Packet-Switched Services
- Frame Relay (FR)
- Ethernet
- IP
VPN Services:
- VPN (Not Reliable)
Network needs:
1. Low to moderate traffic (10 Mbps or less)
Recommendation:
1. ______ if reliability is less important
2. _____________ otherwise
VPN…frame relay
Network needs:
1. High traffic (10-50 Mbps)
Recommendation:
1. _______________ or IP if available
2. ____ if network volume is stable and predictable
3. _____________ otherwise
Ethernet…T3…Frame relay
Network needs:
1. Very high traffic (50 Mbps - 100 Gbps)
Recommendation:
1. _______________ or IP if available
2. __________ if network volume is stable and predictable
Ethernet…SONET
Performance checklist:
- Increase computer and device performance
- Increase circuit capacity
- Reduce network demand
- Upgrade devices
- Change to a more appropriate routing protocol (either static or dynamic)
Increase Computer and Device Performance
- Analyze message traffic and upgrade to faster circuits where needed
- Check error rates
Increase Circuit Capacity
- Check user behavior
- Analyze network needs of all new systems
- Move data closer to users
Reduce Network Demand
The speed in converting input packets to output packets
Latency
Upgrade the devices and computers that connect backbones to the WAN
Improving Device Performance
Examining the routing protocol (static or dynamic)
Improving Device Performance
Find which circuits are approaching capacity
Improving Circuit Capacity
Less-used circuits can be downgraded to save costs
Improving Circuit Capacity
Examining why circuits are heavily used
Improving Circuit Capacity
The use of a service as a backup for heavy traffic
Improving Circuit Capacity
Use data compression techniques for all data in the network
Reducing Network Demand
