单项选择题

Which command do you issue to upgrade the current software on Junos devices?（）

A. request system software replace
B. request system software install
C. request system software add
D. request system software upgrade

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单项选择题

Which command do you use to identify the meaning of a syslog message?（）

A. help log messages
B. man log messages
C. man syslog
D. help syslog

多项选择题

Two devices on an Ethernet segment sent frames at the same time causing a collision. Which twostatements are true?（）

A. Both devices stop transmiting, wait a random period of time, verify the wire is idle, and re-transmit
B. The device with the lowest MAC address is permitted to retrannsmit first
C. The device with the lowest MAC address sends a jam signal to notify all other devices of the collision
D. Both devices send a jam signal to notify all other devices of the collision

单项选择题

Which statement is true regarding the Junos OS?（）

A. All platforms running the Junos OS have identical factory-default configurations
B. All platforms running the Junos OS use the IP2 processor for longest-match lookup
C. All platforms running the Junos OS use the same source code base
D. All platforms running the Junos OS use FXP1 for communication between control and forwarding planes