You’ve been assigned the CIDR (classless inter domain routing) block of 115.64.4.0/22 from your ISP. Which of the IP addresses b

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问题 You’ve been assigned the CIDR (classless inter domain routing) block of 115.64.4.0/22 from your ISP. Which of the IP addresses below can you use for a host? (Select all valid answers)
A. 115.64.8.32
B. 115.64.7.64
C. 115.64.6.255
D. 115.64.3.255
E. 115.64.5.128
F. 115.64.12.128

选项

答案B,C,E

解析 Explanation:
115.64.4.0 = 01110011.01000000.00000100.00000000
Subnet mask = 11111111.11111111.11111100.00000000= 255.255.252.0
Subnet number = 01110011.01000000.00000100.00000000= 115.64.4.0
Broadcast = 01110011.01000000.00000111.11111111= 115.64.7.255
Valid address range = 115.64.4.1 - 115.64.7.254
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