Computer Networks An experiment in dividing subnets

It can be divided like this.

Department: Subnet Mask, Network Number, Host Range, Broadcast Address.

Active machinery. Other 1, Other 2, Other 3

Active machinery.

Other 1, Other 2, Other 3

1. The subnet mask is 19 bits, that is, the network bit is 19 bits, and the host bit is 32 19 13 bits. The maximum number of hosts that can be accommodated in each subnet is 13 bits, and the number of hosts 2 to the power of 13 is 2 8190.

2. The default of class B address is a 16-bit subnet mask, and now it becomes 19 bits, which is to borrow 3 bits of the host to divide the subnet, so the number of bits of the subnet is 3 bits, and it is divided into 8 subnets to the 3rd power of 2.

3. The subnet mask is 22 bits, so the host bit is 32 22 10 bits. The host is 10 bits, and the number of hosts that can be accommodated is 2 to the 10th power of 2 1022.

4. The default of the C address is a 24-bit subnet mask, and now the socks take 28 bits, that is, the host bit has 32 28 4 bits, so the host bit is 4 bits, and the number of hosts is 2 to the 4th power of 2 2 14.

5. It is the broadcast address. From the subnet mask, we can know that the subnet mask is 27 bits, so the increment of the subnet is 32, that is, the range of each subnet is: 0 31, 32 63, so the subnet is located, and this subnet takes all the host bits 1 to be the broadcast address

6. It is the host address. The subnet you are in by 5 can be known to be located, so is a usable host address.

7. Divide 10 subnets, you must divide 16 subnets, because 2 of the 3rd power 8 is not enough, or it can only be 2 of the 4th beam fiber square 16. To divide 16, you need to borrow 4 bits to divide the host, so the subnet mask has changed from the original 24 bits to the current 28 bits. So the subnet mask is.

This is the 28-bit subnet mask (the number of 1s is 28).

1. When dividing subnets, the number of subnets increases with the increase in the number of host bits borrowed by subnet addresses, and the number of available hosts in each subnet gradually decreases, taking Class B addresses as an example.

2. To divide the network into 4 subnets, first apply the calculation formula of subnets: the number of subnets = 2 to the nth power, that is, 4 = 2 to the n power, n is 2.

3. From the above steps, it can be seen that n is 2, that is, it is necessary to borrow 2 bits on the host bit to divide the subnet, and the host bit is left with 6 + 8 = 14 bits.

4. The number of bits of the network mask can be known from the host bit is 32-14 = 18 bits, that is, the subnet mask is 5, and it can be seen from the above that the address block of each subnet is 256-192 = 64.

6. Therefore, the addresses of each subnet are respectively

Categories: Education, Science, >> Learning Aid.

2.A campus network obtains a Class B IP address from the Network Management Center NIC. The campus network needs to consist of at least 210 subnets (including the reserved part).

So, how should the network designer plan the subnet for this Class B address? (Please give specific steps to solve).

Analysis: Question 1:

Recommend 1 subnet calculation tool (although there is no specific solution step you want, but it is really convenient, and you can enter it directly when you actually use it, no need to calculate):

Just enter the two parameters you give and you're good to go:

Format: IP & CIDR Mask:

or IP & Mask:

or IP & Wildcard Mask:

You can get the IP address, family network address, broadcast address, number of addresses, start and end IP address.

yulanmail/chaxun/

Question 2: The number of hosts in the subnet is not given :)

First of all, look at your IP address, if it is 1 subnet, the number of hosts is 65534

If the number of hosts is distributed evenly between each subnet, it is of course simple: 65534 210=312

312 IPs, 2 to the 8th power is 256, 2 to the 9th power is 512, which means that the host binary number of bits has to be 9 1s (in fact, this is the pure wildcard mask of the car), 32-9 = 23

The network address is 23 bits.

Verify the formula I gave in question 1.

In practice, the number of subnets is certainly different, and it is necessary to understand the total number of IP addresses required by each department's office room. It's a different story.

Internet organizations define five types of IP addresses, including A, B, and C addresses. There are 126 of these Class A networks, each of which may have 16,777,214 hosts, all in the same broadcast domain. However, it is impossible to have so many nodes in the same broadcast domain, and the network will be saturated with broadcast communication, resulting in a waste of 16,777,214 addresses that are not allocated.

On the other hand, with the continuous expansion of Internet applications, IP address resources are becoming less and less. In order to achieve a smaller broadcast domain and make better use of each bit of the host address, class-based IP networks can be further divided into smaller networks, with each subnet defined by the router and assigned a new subnet network address, which is created by borrowing the host portion of the class-based network address. After dividing the subnet, the subnet is hidden by using a mask so that the network does not change from the outside, which is the subnet mask.

Up to 4,094 hosts per location.

1. Minimum, maximum.

2. Minimum, maximum.

3. Minimum, maximum.

4. Minimum, maximum.

5, Minimum, Max.

6. Minimum, maximum.

7. Minimum, maximum.

8. Minimum, maximum.

9, Minimum, Max.

10, min, max.

11, min, max.

12, min, max.

13, minimum, maximum.

14, min, max.

15, min, max.

16, min, max.

A detailed explanation of the subnet division of IP addresses.

1. The network prefix is 29

2. Each subnet has 8 addresses, of which 6 addresses can be used for hosts.