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Answers to the Chapter 9 "Do I Know This Already?" Quiz 425
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.
7
Split horizon can cause reachability issues in Frame Relay networks. List two ways in
which you can deal with split horizon problems.
The two methods of dealing with split horizon issues are turning it off (not recommended)
and implementing subinterfaces.
8
If connecting to non-Cisco routers on the other side of a Frame Relay network, what must
be specified in the configuration?
If connecting in a multivendor Frame Relay environment, you must use the IETF
implementation of Frame Relay. This can be done by using the encapsulation frame-
relay ietf
command, or IETF can be specified on each PVC as needed.
9
Frame Relay subinterfaces can be created with two different personalities. What are those
personalities?
Point-to-point and multipoint are the personality options for Frame Relay subinterfaces.
10
In Frame Relay traffic shaping, what is Committed Information Rate (CIR)?
In Frame Relay traffic shaping, CIR is the average rate at which you want to transmit. This
is generally not the same as the CIR provided by the telco, which is the amount you want
to send in periods of noncongestion.
11
If CIR is 64,000 bps, what should be the value of MinCIR?
The recommended setting for MinCIR is one-half of CIR, so MinCIR should be 32,000
bps.