Which of the following command line utilities can Karen, a technician, use to check for open ports?（）

A、nbtstat

B、ipconfig

C、nslookup

D、netstat

Node ’A’ and ’B’ have two network adapters connected to different networks. Adapter 1 is assigned the address 192.168.0.10 with a subnet mask of 255.255.255.0. Adapter 2 is assigned the address 24.76.1.200 with a subnet mask of 255.255.240.0.  What is the minimum number of additional adapters per node required to eliminate a network adapter as a single point of failure？（）  

A、 One adapter per node

B、 Two adapters per node

C、 Four adapters per node

D、 No additional adapters per node

Following an unsuccessful cluster fallover test， it is determined that the nfsrg1 resource group  was the problem causing the cluster to run the config_too_long evetn. The nfsrg1 resource group contains 10 nfs filesystems that are cross-mounted to the other cluster node.  Without modify8ing the time until warning parameters，what can be done to enhance NFS fallover performance？（）  

A、 Increase the number of NFS daemons for increased performance.

B、 Modify the nfsrg1 resource group to use local NFS cross-mounts.

C、 Create a second resource group to manage half the NFS cross-mounts.

D、 Create post events to handle the cross-mounts after fallover processing.

Which two conditions will cause switch-to-wire to occur? （）(Choose two.)

loss of power

QoS congestion

software failure occured

WX device exceeded its license speed

traffic does not match application definiton

A HACMP/XD://HAGeo cluster has been installed with four nodes， two nodes at each site. The cluster is protected from site isolation by the DBFS facility in HACMP/XD://HAGeo.  In the event of a site failure，what happens？（）  

A、 The dominate site will always assume the non-dominate site has failed and continue processing.

B、 The dominate site initiates a call to the non-dominate site to verify if any of the nodes are functional.

C、 The non-dominate site initiates a call to the dominate site to verify if any of the nodes are functional.

D、 The nodes are completely independent and can call each other if they detect a total failure of the ZGeo_Primary network.

在自然数集N上，下面哪种运算是可结合的？（　　）。

A、a*b＝a－b

B、a*b＝max{a，b}

C、a*b＝a＋2b

D、a*b＝｜a－b｜