A subnet mask is a four-octet number used to identify the network ID portion of a 32-bit IP address. A subnet mask is required on all class-based networks, even on networks that are not subnetted.
Default Subnet Mask.
| IP Address Class | Default Subnet Mask |
|---|---|
| Class A | 255.0.0.0 |
| Class B | 255.255.0.0 |
| Class C | 255.255.255.0 |
What are the 3 classes of subnet mask?
Class A, B, and C networks have natural masks, or default subnet masks:
- Class A: 255.0. 0.0.
- Class B: 255.255. 0.0.
- Class C: 255.255. 255.0.
What is the subnet mask for Class D?
Classful addressing definition
| Class | Leading bits | Default subnet mask in dot-decimal notation |
|---|---|---|
| Class A | 0 | 255.0.0.0 |
| Class B | 10 | 255.255.0.0 |
| Class C | 110 | 255.255.255.0 |
| Class D (multicast) | 1110 | not defined |
Is a subnet mask always required?
0.0, 255.255. 0.0 and 255.255. 255.0, so yes, it is necessary to use a subnet mask.
What is Class B’s default mask?
The default subnet mask of class B is 255.255.0.0.
Does Class D need subnet mask?
Class D Address
255.255. Class D is reserved for Multicasting. In multicasting data is not destined for a particular host, that is why there is no need to extract host address from the IP address, and Class D does not have any subnet mask.
What is subnetting Class B addresses?
Class B networks use a default subnet mask of 255.255. 0.0 and have 128-191 as their first octet. The address 172.16. 52.63 is a class B address. Its first octet is 172, which is between 128 and 191, inclusive.
What is a Class D IP address?
Class D addresses are 32-bit network addresses, meaning that all the values within the range of 224.0. 0.0 239.255. 255.255 are used to uniquely identify multicast groups.
What are Class ABC IP addresses?
Designing Your IP Addressing Scheme
| Class | Range | Network Address |
|---|---|---|
| A | 0-127 | xxx |
| B | 128-191 | xxx . xxx |
| C | 192-223 | xxx . xxx . xxx |
What is a Class C subnet?
A class C network would have a subnet mask of 255.255. 255.0 which means that 24 bits are used for the network. In CIDR notation this is designated by a /24 following the IP address.
How does subnet mask affect IP address?
Subnet mask divides the IP address into a network address and host address, hence to identify which part of IP address is reserved for the network and which part is available for host use. Once given the IP address and its subnet mask, the network address (subnet) of a host can be determined.
Why is subnet mask required?
– A subnet mask allows identification of host part and network part of an IP address. – Subnet mask can be used to find if an IP address is present on a subnet or not. – Subnet mask is utilized for isolating the network id and host ids.
Should I change my subnet mask?
Why do we change a Subnet Mask? It is a recommended procedure for increasing a DHCP scope when the current scope has entirely consumed the current subnet mask. However, this method requires you to change all subnet hosts and gateways.
Which IP address is a unicast address of a default subnet mask is used?
Which IP address is a unicast address if a default subnet mask is used? Explanation: The IP addresses 201.34.
What is subnetting of IP address?
A subnetwork or subnet is a logical subdivision of an IP network. The practice of dividing a network into two or more networks is called subnetting. Computers that belong to the same subnet are addressed with an identical most-significant bit-group in their IP addresses.
What is subnet address?
Subnet addressing allows an autonomous system made up of multiple networks to share the same Internet address. For example, an organization can have a single Internet network address that is known to users outside the organization, yet it can configure its network internally into departmental subnets.
Which IP address is a Class C address quizlet?
The IP address range for Class C is 192.0. 0.0 to 223.255. 255.255.
What class does the IP address 10.0 0.0 8 belong?
The 10.0. 0.0/8 private network is a class A network ID that allows the following range of valid IP addresses: 10.0. 0.1 to 10.255. 255.254.
What kind of networks use a Class A or Class B or Class C IP address typically?
What kind of networks use a Class A or Class B or Class C IP address typically? Class A IP address is used for a network with large number of hosts. Class C IP address is used for a network with less number of hosts. Class B IP address is used for a network with medium number of hosts.
Which one is the correct subnet mask for a class B network that can support 1022 hosts?
255.255.252.0
Subnetting a Class B network address
| Mask | Binary | Hosts per subnet |
|---|---|---|
| 255.255.248.0 | 11111000.00000000 | 2,046 |
| 255.255.252.0 | 11111100.00000000 | 1,022 |
| 255.255.254.0 | 11111110.00000000 | 510 |
| 255.255.255.0 | 11111111.00000000 | 254 |
How many subnets are in a Class C network?
128 subnets
Class C /31 borrows 7 bits for the network address from the host address. That gives us 128 subnets, which is 2 to the power of 7. /31 can accommodate two hosts each. The valid host addresses would be 200.15. 10.0 to 200.15.
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