请参见图示。以下哪项可作为RTA上新子网的有效的网络地址？（）
A. 10.16.10.16/28
B. 10.16.10.24/28
C. 10.16.10.30/28
D. 10.16.10.56/28
E. 10.16.10.72/28
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It’s a configuration that experts are calling a "firewall sandwich，" with the second firewall providinga second level of load balancing after traffic down. What is meant by the term "firewall sandwich"？（）
A. single layer of firewalling
B. multiple layers of firewalling
C. firewall connections in either an active or standby state
D. an architecture in which all traffic between firewalls goes through application-specific servers
下列各项中，应记入“坏账准备”账户贷方核算的有（）。
A. 按规定提取的坏账准备
B. 确认坏账损失
C. 收回过去确认并转销的坏账
D. 冲销多提的坏账准备
E. 到期无法收回的应收票据
请参见图示。哪两个地址是“内部全局”地址（）
A. 192.168.7.3
B. 64.100.1.5
C. 198.133.219.35
D. 192.168.7.2
E. 198.133.219.44
F. 64.100.1.4
G. 192.168.7.1
请参见图示。主机 A 所处子网的广播地址是什么（）
A. 10.255.255.255
B. 10.144.255.255
C. 10.149.255.255
D. 10.149.191.255
E. 10.159.255.255
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