426 Chapter A: Answers to the "Do I Know This Already?" Quizzes and Q&A Sections
12
List the steps in defining a map class for Frame Relay traffic shaping.
First, create the map class at global config. Then, define the traffic parameters for the map
class. Finally, associate the map class with a VC or an interface.
13
In map class configuration mode, what command enables the router to respond to BECN
requests?
frame-relay adaptive-shaping becn
14
In map class configuration mode, what command specifies the CIR if you want CIR set to
512000 bps?
frame-relay cir 512000
15
In periods of congestion, what is the percentage drop of throughput experienced with each
BECN?
The drop is 25 percent but does not exceed MinCIR.
Answers to the Chapter 9 Q&A Section
1
Is Frame Relay connection-oriented or connectionless?
Frame Relay is connection-oriented.
2
Frame Relay virtual circuits come in two flavors. What are those flavors?
Frame Relay virtual circuits can be PVC or SVC.
3
Frame Relay virtual circuits are logically defined by a DLCI. What is the range of valid
DLCIs?
Valid DLCIs fall in the range of 161007.
4
The Frame Relay star topology is also known as what?
It is also known as hub and spoke
5
In a 40-route Frame Relay network running in a full mesh topology, how many
connections exist?
You need 780 virtual circuits to fully mesh the routers in the network. The number is
calculated with this formula: n(n
Ч 1) ч 2, where n is the number of routers.
6
What is an advantage of a partial mesh network?
A partial mesh provides a compromise between cost and redundancy. With a partial mesh,
critical or high volume sites can have redundant connections and avoid traversing a central
site router.