Junos Enterprise Routing, 2nd Edition

Chapter Review Answers

1. Answer: B. J-series routers do not contain PICs, so this value in the interface name is always set to zero and is sometimes referred to as the virtual PIC value.

2. Answer: A, D. ge-0/1/0 is a transient interface, whereas fxp3 and loopback0 are invalid media types.

3. Answer: D. A point-to-point interface has only one valid logical unit number, which is unit 0.

4. Answer B. Every transient interface always takes the form of MM-F/P/T, with F indicating the PIM slot and T representing the port number.

5. Answer: A. The monitor statistics command is an invalid command, whereas monitor traffic displays local TCP/IP traffic and show interfaces does not display information dynamically.

6. Answer: False. Juniper interfaces are always administratively enabled when installed.

7. Answer: D. The default encapsulation is PPP on all point-to-point interfaces.

8. Answer: A. As of Junos version 8.3, eight interfaces are allowed in a single bundle.

9. Answer: C. A serial interface always attempts to obtain its transmit timing from the line itself, using what is called loop timing. Other valid options that can be configured include internal and dce. DTE is not a configurable option.

10. Answer: B. The only other valid Junos command listed in the answer choices is the deactivate command. This command comments out the configuration that the running system will ignore.

11. Answer: False. Only M/T-series routers contain an fxp0 OoB management interface. J-series routers must be managed via console, auxiliary ports, or regular PFE interfaces.

12. Answer: C. The software pseudointerface that is used to create GRE tunnels is the gr interface. The gre interface is used internally by the router and should not be configured. The ip.0 and tunnel.0 interfaces are not valid interface types.