Question

Отметьте все значения, которые могут быть масками подсетей. 1) 255.255.255.224 2.) 255.255.0.255 3) 255.255.0.0 4)255.255.255.192 5).255.255.192.192

Answer 1

В двоичной записи маски всегда сначала должны идти только единицы, а потом только нули.
Значит маски под номером 2 и 5 не подходят.
Ответ: 
1) 255.255.255.224
3) 255.255.0.0
4)255.255.255.192

Answer 2

Subnet Mask Values

A subnet mask is a 32-bit number used to divide an IP address into network and host portions. It is used to determine which part of the IP address represents the network and which part represents the host. Here are the subnet mask values provided:

1) 255.255.255.224: This subnet mask is used to divide an IP address into 30 host addresses. It allows for 5 bits to represent the network portion and 3 bits to represent the host portion. This means that the first 29 bits of the IP address are used to represent the network, while the last 3 bits are used to represent the host. The remaining 2 bits are reserved for special purposes.

2) 255.255.0.255: This subnet mask is not a valid subnet mask. The second octet has a value of 0, which means that it cannot be used as a subnet mask. Subnet mask values should have consecutive 1s followed by consecutive 0s.

3) 255.255.0.0: This subnet mask is used to divide an IP address into 65,536 host addresses. It allows for 16 bits to represent the network portion and 16 bits to represent the host portion. This means that the first 16 bits of the IP address are used to represent the network, while the last 16 bits are used to represent the host.

4) 255.255.255.192: This subnet mask is used to divide an IP address into 62 host addresses. It allows for 6 bits to represent the network portion and 2 bits to represent the host portion. This means that the first 26 bits of the IP address are used to represent the network, while the last 2 bits are used to represent the host. The remaining 4 bits are reserved for special purposes.

5) 255.255.192.192: This subnet mask is not a valid subnet mask. The third and fourth octets have a value of 192, which means that they cannot be used as subnet mask values. Subnet mask values should have consecutive 1s followed by consecutive 0s.

Please note that subnet masks are typically represented using CIDR notation, which specifies the number of consecutive 1s in the subnet mask. For example, the subnet mask 255.255.255.224 is often represented as /27, indicating that the first 27 bits of the IP address are used to represent the network.