JNCIA questions with correct answers

What is the advantage of the "show interfaces interface name extensive" command? - Answer This command is ideal for troubleshooting interfaces because it shows error, statistics, and physical and logical interface properties. What are some advantages of the Junos OS? - Answer The Junos OS is compartmentalized into multiple software processes. Each process runs in its own protected memory space, ensuring that one process cannot directly interfere with another. This modularity also ensures that new features can be added with less likelihood of breaking current functionality. What are the primary functions of the control plane and the forwarding plane on Junos devices? - Answer The primary functions of the Control Plane are to maintain routing intelligence, control and monitor the chassis, and mange the PFE (packet forwarding engine). The primary functions of the Forwarding Plane are to forward packets and implement advanced services. How are the transit and exception traffic processed? - Answer Transit traffic is forwarded through the PFE on platforms running the Junos OS, based on the forwarding table installed on the PFE. Exception traffic is processed locally by the platform running the Junos OS by either the PFE or RE depending on the type of traffic. Host-bound packets, such as protocols and management traffic, are passed directly to the RE for processing, while traffic requiring ICMP error message responses is typically handled by the PFE.