（多选）下列等值式成立的有（　　）。

A

P→Q⇔¬Q→¬P

B

P∨（P∧R）⇔R

C

P∧（P→Q）⇔Q

D

P→（Q→R）⇔（P∧Q）→R

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

Which three CLI modes are available on the ERX Edge Router？（）

User Exec

Privileged Exec

Super User Exec

Global Configuration

Private Configuration

Which command configures an ATM PVC in a Bridged 1483 network？（）

A、atm pvc 33 0 33 aal5snap

B、atm pvc 33 0 33 aal5bridge

C、atm pvc 33 0 33 bridge1483

D、atm pvc 33 0 33 1483bridge

若有定义int a;float b;double c;程序运行时输入：3 4 5能把值3输入给变量a、4输入给变量b、5输入给变量C的语句是（　　）。

A、scanf("%lf%lf%lf",&a,&b,&c);

B、scanf("%d%lf%lf",&a,&b,&c);

C、scanf("%d%f%f",&a,&b,&c);

D、scanf("%d%f%lf",&a,&b,&c);

The ERX Edge Router responds to a received PPP over Ethernet Active Discovery Initiation （PADI） with which message type？（）

A、PPPoE Active Discovery Offer

B、PPPoE Active Discovery Initiation

C、PPPoE Active Session Confirmation

D、PPPoE Active Session Acknowledgment