【单选题】以下哪一项是常见Web站点脆弱性扫描工具:()
【单选题】以下不能满足当c的值分别为1、3、5三个数时值是“真”,否则值是“假”的表达式是
A.
!((c<3)&&(c>1))&&!((c<5)&&(c>3))&&(c<=5)&&(c>=1)
B.
(c==1)||(c==3)||(c==5)
C.
(c!=2)&&(c!=4)&&(c>=1)&&(c<=5)
【简答题】当a、b、c的值分别为3、4、5时,以下语句执行后b的值为_________。 if (a>c) {a=b;b=c;c=a;} else {a=c;c=b;b=a;}
【判断题】1.255和192.168.1.0都可以分配给主机使用
【单选题】以下不能满足当c的值分别为1、3、5三个数时值是“真”,否则值是“假”的表达式是 ( )
A.
!((c<3)&&(c>1))&&!((c<5)&&(c>3))&&(c<=5)&&(c>=1)
B.
(c= =1)||(c==3)||(c==5)
C.
(c!=2)&&(c!=4)&&(c>=l)&&(c<=5)
【单选题】从当前的情况看,我国质量监督主体的主导者是( )
【单选题】If the router R1 has a packet with a destination address 192.168.1.255, what describes the operation of the network()。
A.
R1 will forward the packet out all interfaces.
B.
R1 will drop this packet because this it is not a valid IP address.
C.
As R1 forwards the frame containing this packet, Sw-A will add 192.168.1.255 to its MAC table.
D.
R1 will encapsulate the packet in a frame with a destination MAC address of FF-FF-FF-FF-FF-FF
E.
As R1 forwards the frame containing this packet, Sw-A will forward it to the device assigned the IP address of 192.168.1.255.
【单选题】当a,b,c的值分别为3,4,5时,以下各语句执行后a,b,c的值为多少( ) if (a>c) {a=b; b=c; c=a;} else {a=c; c=b; b=a;} printf(“%d,%d,%d”,a,b,c);
【单选题】当a,b,c的值分别为3,4,5时,以下各语句执行后a,b,c的值为多少( ) if (a>c) {a=b;b=c;c=a;} Else {a=c;c=b;b=a;} printf(“%d,%d,%d”,a,b,c);
【单选题】C类地址192.168.1.139的子网广播地址是?