background image
644 Appendix A: Answers to Review Questions
WAN links usually cause the most latency in the WAN. Switches and routers contribute
the least amount of latency.
25
When provisioning hardware, what do you need to consider in addition to node capacity?
You need to consider the capacity of links in addition to node capacity.
26
Why is protocol selection important with regard to network design?
Protocols can consume large quantities of bandwidth due to broadcasts. If a station spends
too much time processing broadcasts, the network can become efficient.
27
What is typically the largest cost not related to support?
The recurring costs of the WAN links.
28
Your design will require compression, congestion, control, and security. At what layer
should this be implemented?
Distribution.
29
Why has the hierarchical layer been a successful factor in network design?
Hierarchical models can make complex network problems simpler. By assigning specific
functions to each tier, the hierarchical model aids in manageability and scalability. In
addition, it allows for ease of troubleshooting.
30
What Cisco IOS features can improve WAN utilization and performance?
Header, link, and payload compression.
Priority queuing and bandwidth reservation.
Proxy services between the router and clients.
Encapsulation and tunneling across the WAN core.
Chapter 2
1
What is the first step in campus network design?
Identifying the business and technical requirements.
2
What two backbones are the recommended models for the Campus LAN design?
Distributed and collapsed.
3
What business issues govern the design acceptance process?
Business issues are governed by cost. In addition to fixed equipment costs, recurring costs
must be considered. Determining the total cost of ownership is critical to ensuring the
long-term success of the network.
87200333.book Page 644 Wednesday, August 22, 2001 1:41 PM