For questions about subnet masks, double choice questions

IP address and subnet mask division knowledge.

It is not a valid subnet mask, because the subnet mask is composed of consecutive 1s and 0s, which is converted to binary, which obviously does not meet the requirements.

The length of the subnet mask is also 32 bits, and on the left is the network bit, which is represented by the binary digit "1"; On the right is the host bit, which is represented by the binary number "0", which is conceptually invalid no matter how you look at it.

BS structure is a network structure model that emerged after the emergence of the Internet with the development of the Internet. This model unifies the client and allows the core business processing to be completed on the server side. You only need to install a browser on your computer or mobile phone, and you can interact with the database through the web server.

The function of the subnet mask is to obtain the network address after the IP address and the operation, and the subnet mask is also 32bit, and it is composed of a string of 1 followed by a string of 0, where 1 represents the number of bits corresponding to the network number in the IP address, and 0 represents the number of bits corresponding to the host in the IP address.

Each subnet requires 25 hosts 2 n-2 25, and n takes 5, that is, the host bit needs 5 bits. Subnet slots remain3 bits, the number of subnets

is a Class C IP with a standard mask. The subnet bit is taken as 3 and the subnet mask is taken.

is 0000 i.e

1.The subnet number occupies 27 digits.

2.It can be divided into 8 subnets.

3.The subnet mask is.

Answer]: C introduces subnets in a network, which is to further divide the host identity into subnet number and host number, and the scale of each subnet can be controlled by flexibly defining the number of bits of the subnet number. For example, if a university's Class B network allows access to a maximum of 65,534 computers, the subnet number is set to 4, which is divided into 16 subnets, and each subnet is allowed to access a maximum of 4,094 computers.

Note that the subnetting will result in a decrease in the actual number of assignable IP addresses. For example, in the above example, the assignable IP addresses before the subnet division are 65534, and the assignable IP addresses after the subnet division are 65504 (4094 16), which is reduced by 30. But this loss is insignificant compared to the huge gains from subnetting.

To determine whether two machines are in the same subnet, you need to use a subnet mask. Like the IP address, the subnet mask is also a 32-bit binary number, but its network number and subnet number are all 1, and the host number part is 0. For example, the subnet mask for the example above is 11111111 11111111 11110000 00000000, ie.

To determine whether two IP addresses are in the same subnet, you only need to determine whether the results of the logical "AND" of the two IP addresses and the subnet mask are the same. For example, in the example above, let the IP addresses a, b, and c be ., respectively. Convert a, b, and c to binary representations, respectively:

10111110 01001110 11110000 0000000110111110 01001110 11111010 0000000110111110 01001110 11100110 00000001 and subnet mask 11111111 11111111 11110000 00000000 logical slag answer "and" results are: 10111110 01001110 11110000 0000000010111110 01001110 11110000 0000000010111110 01001110 11100000 00000000 so the IP address is in a subnet and the IP address is not in a subnet.

The function of the subnet mask is to be next to the segment ().

a.Marks the network bits of an IP address.

b.Distinguish between types that contain a missing IP address.

c.Mark the host bit of an IP address to talk about the god site.

Correct Answer: a

c. The function of the subnet mask is to distinguish whether the hosts on the network are in the same network segment.

The method of determining whether multiple host addresses are in the same network segment is to use the subnet mask and host address bitwise sum operation, and the result is the network address where each host is located, if the network address is the same, it proves that multiple hosts belong to the same network segment.

An antimask is a wildcard mask.

Tell the device which bit to match by marking 0 and 1.

Because it is the opposite of the subnet mask, it is also called an antimask.

For example, the mask is.

wildcard-mask

It's just a cover-up.

The inverse subnet mask is.

The inverse subnet mask is also known as the wildcard.

Inverse Subnet Mask Explained:

An inverse subnet mask is a wildcard mask that tells the device which bit to match by marking 0 and 1. In the inverse subnet mask, addresses with corresponding bits of 1 are ignored in the comparison, and addresses with 0 must be checked. The IP address and the antimask are both 32-bit numbers, which are also called inverse subnet masks because they are just the opposite of the subnet mask.

For example, the mask is , the wildcard-mask is , and the inverse subnet mask is.