Junos Enterprise Routing, 2nd Edition

Chapter Review Answers

1. Answer: D. FRF.16 allows bonding of physical interfaces together, whereas FRF.15 bonds multiple DLCIs together.

2. Answer: False. Some PICs will use an lsq interface, and others will use an ls interface. lsq allows for more CoS features than ls.

3. Answer: A. In Junos software, you configure the total number of aggregate interfaces in the chassis stanza.

4. Answer: C. When MLPPP is enabled, packets will be sent down each link on a per-fragment basis. Since each packet fragment will have an MLPPP header with a sequence number, order will be maintained by the end device.

5. Answer: B. If fragmentation does not occur on an MLPPP link, the packets are balanced over a flow (source IP, destination IP, protocol, etc.). Since nonfragmented packets will not contain an MLPPP header, per flow is the only way to maintain packet order.

6. Answer: D. Compressed RTP decreases the header size to a few bytes, which reduces serialization and queuing delay.

7. Answer: A, B, C. The uPIM module on J-series routers and the XPIM on the SRX650 can be configured to operate in router, switch, or enhanced switch modes of operation.

8. Answer: A. You can integrate ASM into an M7i router only. For other M-series routers, you must install a physical PIC into a slot.

9. Answer: B, D. Traffic can be classified for RTP compressed based on port numbers or based on which queue a packet was placed into. If both match conditions are configured, a packet will be compressed if either condition is met.