JUNOS Enterprise Routing

Chapter Review Questions

1. Which IP CoS approach requires signaling to reserve resources?

   1. IP ToS

   2. IntServ

   3. DiffServ

   4. ATM

2. In the DiffServ architecture, what is a BA?

   1. A sequence of packets with a shared marking, crossing a given link

   2. The collective behavior of all nodes in the domain

   3. The act of aggregating multiple reservations into a single, larger one, for scalability

   4. None of the above

3. With regard to J-series versus M-series CoS capabilities, which is true?

   1. The M-series can support only four queues; the J-series supports eight

   2. The M-series does not support per-unit scheduling

   3. The J-series WRED cannot be protocol-based, whereas the M-series WRED can be

   4. The M-series offers LLQ support, whereas the J-series does not

4. How do you convey packet loss priority to a downstream node?

   1. By implementing the same multifield classifiers as used originally at the ingress

   2. This is not possible because the IP header does not support a loss-priority flag

   3. You must reclassify all packets with high loss priority into a forwarding class reserved for that purpose

   4. Use a BA rewrite table with a matching BA classifier

5. What is the actual scheduling priority when used on an M7i?

   lab@PBR#show schedulers
   . . .
   bronze_sched {
       transmit-rate 10m exact;
       priority medium-high;
   }

   1. Low

   2. High

   3. Strict-high

   4. This will not commit because the M7i supports only two priority levels

6. Which of the following is true?

   1. On the J-series, strict-high and high are the same priority

   2. On the M-series, strict-high is a separate priority

   3. You must use the exact option with a strict-high ...