【单项选择题】
Companycom is installing a p5 590 with a HMC to manage LPARs. The customer is very concerned about security and wants to restrict network traffic that is not necessary.<br /> What is necessary for communication between the LPARs and the HMC?（）<p> Companycom is installing a p5 590 with a HMC to manage LPARs. The customer is very concerned about security and wants to restrict network traffic that is not necessary.<br /> What is necessary for communication between the LPARs and the HMC?（）</p>
A、A.An administrative VLAN with port 1808
B、B.Port 657 which must remain open to TCP/IP and UDP traffic
C、C.Network addresses are provided by DHCP services on the network
D、D.DHCP on the HMC is required to be on to communicate between LPAR and HMC
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