What are three physical interface properties?（）

多项选择题Which two commands allow you to return to a previous verision of software on the device?（）

A. request sytem software add
B. request sytem software downgrade
C. request sytem software replace
D. request sytem software rollback

单项选择题Which statement is true regarding the Junos OS?（）

A. Each process runs in its own protected memory space ensuring that one process cannot directly interface with another
B. Process share memory space but separate ASICs so that one process cannot directly interfere with another
C. A central processor called the IP2 chip dynamically assings memory as process needs fluctuate
D. The memory management daemon (mmd) is responsible for allocating new memory for process as they request it

单项选择题What must be configured prior to the first commit after factory defaults are loaded?（）

A. root authentication
B. default gateway
C. hostname
D. management services

多项选择题Which two fields are found in an Ethernet frame header?（）

A. TTL
B. flags
C. checksum
D. type

多项选择题You have been asked to configure your router to send link-related SNMP trap notifications to the network managemetn system (NMS) located at address 172.16.17.1.Which two commands are required?（）

A. set snmp trap-group my-trap-group targets 172.16.17.1
B. set snmp targets 172.16.17.1
C. set snmp trap-group my-trap-group link-status
D. set snmp trap-group my-trap-group categories link