Junos Enterprise Routing, 2nd Edition

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. 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

4. 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 queue to prevent starvation

   4. Policing should be used when strict-high is set, especially on the J-series

5. What is the purpose of the shaping-rate statement in the following code snippet?

      test_sched {
           transmit-rate percent 5;
           shaping-rate percent 20;
           priority high;
       }

   1. It ensures that this queue cannot starve other queues of their configured weight

   2. It limits how much traffic this queue can send, even when all other queues are idle

   3. It shapes the traffic allowed by the transmit rate so that at least 20% of the packets are not clumped

   4. This is used in adaptive shaping, ...