Task 8.1 : some questions

1. why do they configure TC=10 ms on pvc # 401 and 405 ? (why not the default value ?)

2. why do they configure Be expliciltly ? I didn't configure it, and i have nevertheless the right value on ouput:

map-class frame-relay DLCI_402
frame-relay cir 512000
frame-relay bc 5120
frame-relay fair-queue
frame-relay fragment 640

Rack1R4#sh traffic-shape
Interface Se1/0.124
Access Target Byte Sustain Excess Interval Increment Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes) Active
402 512000 640 5120 0 10 640 -
401 512000 640 5120 0 10 640 -

3. Why do they use a CIR of 512 with DLCI 405 and 401 ?
T1 = 1544, and 1544 - 512 (CIR of dlci # 402) = 1032.
Thus the CIR of DLCI 405 & 401 should be 516 k . Have i missed something ?

4. Why do they not configure fragmentation on R1 on R5 ?
Whitout configuration of fragmentation on these routers, it is impossible to ping their serial interface IP address.

thx
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