What is the 0th subnet?
An example of an IP address that is using a zero subnet is 10.1. 0.1 with a subnet mask of 255.255. 255.0. This IP address may look pretty weird to you. Some people may even try to argue that it is an invalid IP address because there is a 0 in third octet.
What is the IP subnet-zero command?
The ip subnet-zero command provides the ability to configure and route to subnet-zero subnets. Subnetting with a subnet address of zero is discouraged because of the confusion inherent in having a network and a subnet with indistinguishable addresses.
What is a 0 network?
A zero-configuration network is an IP network that is configured without using any manual configuration or configuration servers. Automatic functions include allocating IP addresses, translating between domain names and IP addresses, and locating services such as printing without employing a directory service.
Why all zeros and all ones are not assigned to IP address?
When such usage is called for, the address zero is to be interpreted as meaning “this”, as in “this network”. The address of all ones are to be interpreted as meaning “all”, as in “all hosts”. For example, the address 128.9. 255.255 could be interpreted as meaning all hosts on the network 128.9.
Can you have zero subnets?
–> Subnetting divides one large network into smaller subnets. –> If any network is subnetted, in that the first subnet is called zero subnet and the last subnet in the subnetted network is called all one subnet.
What does 0.0 0.0 0 mean in a routing table?
In the context of routing tables, a network destination of 0.0. 0.0 is used with a network mask of 0 to depict the default route as a destination subnet. This destination is expressed as 0.0. 0.0/0 in CIDR notation. This indicates that the gateway to reach the corresponding destination subnet is unspecified.
What is IP classless command?
A router configured with the “ip classless” command tries to match the the specific subnet and ignores the class (A, B or C) of network and only uses the default route when no match is made.
What does a subnet mask of 0.0 0.0 mean?
0.0 is used with a network mask of 0 to depict the default route as a destination subnet. This indicates that the gateway to reach the corresponding destination subnet is unspecified. This generally means that no intermediate routing hops are necessary because the system is directly connected to the destination.
Can IP address contain 0?
The “0” can be used, but the net mask must be different from the standard class A B or C addresses. Here is an example. However 192.168. 4.0 Would NOT be legal.
How many subnets need to be created from the 172.16 0.0 16 network?
subnets
The subnet mask is bit-oriented. We could subdivide 172.16. 0.0/16 into 16 subnets with the mask 255.255. 240.0, i.e. 172.16.
What is a 0.0.0.0 Gateway?
The address 0.0.0.0 generally means “any address”. If a packet destination doesn’t match an individual address in the table, it must match a 0.0.0.0 gateway address. In other words, default gateway is always pointed by 0.0.0.0: route -n.
Why does Cisco router require IP subnet-ZERO command?
As of Cisco IOS Software Release 12.0, Cisco routers now have ip subnet-zero enabled by default, but if the network engineer feels that it is unsafe to use subnet zero, the no ip subnet-zero command can be used to restrict the use of subnet zero addresses.
Can a subnet zero be used for addressing?
Traditionally, it was strongly recommended that subnet zero and the all-ones subnet not be used for addressing. According to RFC 950 , “It is useful to preserve and extend the interpretation of these special (network and broadcast) addresses in subnetted networks.
Which is the zero subnet in clasfull routing?
The 192.1.2.0/28 is the zero subnet of it, 192.1.2.16/28 is the first subnet of it and so on. The zero subnet can be used with clasfull routing scheme when enabled by ‘ip subnet-zero’ command only. Rate useful advices (or mark answer as correct, if applicable).
Which is the first subnet of a Cisco Network?
For more information on document conventions, refer to the Cisco Technical Tips Conventions. If a network address is subnetted, the first subnet obtained after subnetting the network address is called subnet zero. Consider a Class B address, 172.16.0.0.