# data[].attributes.body
Classful is based on the default Class A,B or C networks.

- Class A: 0 - 127 with a mask of 255.0.0.0 (/8)

- Class B: 128 - 191 with a mask of 255.255.0.0 (/16)

- Class C: 192 - 223 with a mask of 255.255.255.0 (/24)

Classless

Classless on the other hand, allows the use of variable length subnet masks, or VLSM, because subnet mask information is included with routing updates. You can have a mixture of different subnet masks in the same routing domain.

10.1.0.0/19

10.2.0.0/20

172.16.8.0/21

172.16.16.0/24

# data[].attributes.body
A classful network uses IP addresses of the same network class in all its sub-networks and in addition, the same subnet mask in all the subnets (i,e if class A, all the IP addresses in the network are of class A)
======================
Classless networks enable the use of IP addresses with different subnet masks in the same network to enable efficient use of IP addresses

# data[].attributes.headline
CLASSFUL ADDRESS: means that when analyzing IP Addresses, the addresses are considered to have a one, two or three octet network part, with the remainder of the Addresses being the host part.

# data[].attributes.subject
CLASSFUL ADDRESS: means that when analyzing IP Addresses, the addresses are considered to have a one, two or three octet network part, with the remainder of the Addresses being the host part.

# data[].attributes.body
CLASSLESS ADDRESS: Ignores class A,B and C rules, treating each IP Address as having only two parts: a subnet part and a host part.

# data[].attributes.body
Classful:  The original addressing format. classful ip packets. No way to include a custom subnet mask.

Classless:  This is really referring to the way routers treat the mask, and how they route packets.  In the old way, the subnet mask was not sent with the routing updates.  Now it is the way routers treat the mask when forwarding packets, (including routing updates)...the custom subnet mask is included.

# data[].attributes.body
Classful is based on the default Class A,B or C networks.

- Class A: 0 - 127 with a mask of 255.0.0.0 (/8)

- Class B: 128 - 191 with a mask of 255.255.0.0 (/16)

- Class C: 192 - 223 with a mask of 255.255.255.0 (/24)

All devices in the same routing domain must use the same subnet mask. Since routers running a classful routing protocol do not include subnet mask information with routing updates, the router assumes either its own subnet mask, or defaults to the classful subnet mask.

Classless on the other hand, allows the use of variable length subnet masks, or VLSM, because subnet mask information is included with routing updates. You can have a mixture of different subnet masks in the same routing domain:

- 10.1.0.0/19

- 10.2.0.0/20

- 172.16.8.0/21

- 172.16.16.0/24

# data[].attributes.body
Classless routing protocols do send the subnet mask with their updates. Thus, Variable Length Subnet Masks (VLSMs) are allowed when using classless routing protocols.

Examples of classful routing protocols include RIPv1 and IGRP.

“classful” router has an interface connected to a major network, it believes it knows all routes connected to that major network.

For example, a router may have an interface attached to the 10.1.5.0/24 network. It may also have routes from a routing protocol, also for the 10.x.x.x network.

However, if the classful router receives a packet destined for a 10.x.x.x subnet that is not in the routing table, it will drop that packet, even if there is a default route.

# data[].attributes.body
Classful networks use the 'classful' subnet mask according to the leading bits in the first block of the IP address:

Class A begins with binary 0 (0-127.x.x.x)

So and IP address 0.0.0.0 to 127.255.255.255 use subnet mask = 255.0.0.0

Class B begins with binary 10 (128-191)

So IPaddresses 128.0.0.0 to 192.255.255.255 use subnet mask = 255.255.0.0

Class C begin with binary 110 (192-223)

So IP addresses 192.0.0.0 to 255.255.255.0 use a subnet mask = 255.255.255.0

Classless IP addressing means you can use any subnetmask you want, even assigning partial blocks. For example subnet 172.16.0.0 is a class B network.

But you have two physical interfaces on your router that connect to switches with 5 VLANs. Classless routing allows me to break up this IP address into more useful segments.

# data[].attributes.headline
Classful Vs Classless Address Hello friends in this post i am again going to tell you some more interesting concepts of networking.In this post i am going to tell you what is the difference between classfull and classless address. Classful addressing: In the classful addressing system all the IP addresses that are available are divided into the five classes A,B,C,D and E, in which class A,B and C address are frequently used because class D is for Multicast and is rarely used and class E is reserved and is not currently used.Each of the IP address belongs to a particular class that's why they are classful addresses.Earlier this addressing system did not have any name,but when classless addressing system came into existence then it is named as Classful addressing system.The main disadvantage of classful addressing is that it limited the flexibility and number of addresses that can be assigned to any device.One of the major disadvantage of classful addressing is that it does not send subnet information but it will send the complete network address. The router will supply its own subnet mask based on its locally configured subnets. As long as you have the same subnet mask and the network is contiguous, you can use subnets of a classful network address.2. Classless Addressing: Classless addressing system is also known as CIDR(Classless Inter-Domain Routing).Classless addressing is a way to allocate and specify the Internet addresses used in inter- domain routing more flexibly than with the original system of Internet Protocol (IP) address classes.What happened in classful addressing is that if any company needs more than 254 host machines but far fewer than the 65,533 host addresses then the only option for the company is to take the class B address.Now suppose company needs only 1000 IP addresses for its host computers then in this (65533-1000=64533) IP addresses get wasted.For this reason, the Internet was, until the arrival of CIDR, running out of address space much more quickly than necessary. CIDR effectively solved the problem by providing a new and more flexible way to specify network addresses in routers.A CIDR network address looks like this: 192.30.250.00/15 The "192.30.250.00" is the network address itself and the "15" says that the first 15 bits are the network part of the address, leaving the last 17 bits for specific host addresses.One more advantage of classless addressing is that classless protocol sends subnet information. This allows you to create discontiguous networks with any given classful network address. 

# data[].attributes.subject
Classful Vs Classless Address Hello friends in this post i am again going to tell you some more interesting concepts of networking.In this post i am going to tell you what is the difference between classfull and classless address. Classful addressing: In the classful addressing system all the IP addresses that are available are divided into the five classes A,B,C,D and E, in which class A,B and C address are frequently used because class D is for Multicast and is rarely used and class E is reserved and is not currently used.Each of the IP address belongs to a particular class that's why they are classful addresses.Earlier this addressing system did not have any name,but when classless addressing system came into existence then it is named as Classful addressing system.The main disadvantage of classful addressing is that it limited the flexibility and number of addresses that can be assigned to any device.One of the major disadvantage of classful addressing is that it does not send subnet information but it will send the complete network address. The router will supply its own subnet mask based on its locally configured subnets. As long as you have the same subnet mask and the network is contiguous, you can use subnets of a classful network address.2. Classless Addressing: Classless addressing system is also known as CIDR(Classless Inter-Domain Routing).Classless addressing is a way to allocate and specify the Internet addresses used in inter- domain routing more flexibly than with the original system of Internet Protocol (IP) address classes.What happened in classful addressing is that if any company needs more than 254 host machines but far fewer than the 65,533 host addresses then the only option for the company is to take the class B address.Now suppose company needs only 1000 IP addresses for its host computers then in this (65533-1000=64533) IP addresses get wasted.For this reason, the Internet was, until the arrival of CIDR, running out of address space much more quickly than necessary. CIDR effectively solved the problem by providing a new and more flexible way to specify network addresses in routers.A CIDR network address looks like this: 192.30.250.00/15 The "192.30.250.00" is the network address itself and the "15" says that the first 15 bits are the network part of the address, leaving the last 17 bits for specific host addresses.One more advantage of classless addressing is that classless protocol sends subnet information. This allows you to create discontiguous networks with any given classful network address. 

# data[].attributes.headline
Classless:  This is really referring to the way routers treat the mask, and how they route packets.  In the old way, the subnet mask was not sent with the routing updates.  Now it is the way routers treat the mask when forwarding packets, (including routing updates)...the custom subnet mask is included.Classful:  The original addressing format. classful ip packets. No way to include a custom subnet mask.

# data[].attributes.subject
Classless:  This is really referring to the way routers treat the mask, and how they route packets.  In the old way, the subnet mask was not sent with the routing updates.  Now it is the way routers treat the mask when forwarding packets, (including routing updates)...the custom subnet mask is included.Classful:  The original addressing format. classful ip packets. No way to include a custom subnet mask.

# data[].attributes.body
1) It allows us to use variable length subnet mask so also knon as

2) Different subnet mask used in same network.

# data[].attributes.body
Classless addressing refers to the use of subnetmask where the network administrator can use any subnet mask they want. Using partial blocks is acceptable in classless IP addressing. It also allows network administrator to break IPs into more segments. to  While classlful networks use clasful subnetsmasks based on the first bit of the block and that associate the ip with the leading bit of the subnetmask. For example, class A IP addresses will have a 255 leading bit of the subnetmask.

# data[].attributes.body
Classful addressing divides IP into network ID and host ID while classless addressing no division into host or network ID.

# data[].attributes.body
Classless addressing : Classless addressing uses a variable number of bits for the network and host portions of the address. Classless addressing treats the IP address as a 32 bit stream.
Classfull addressing : All IP addresses have a network and host portion .The classfull addressing system all the IP addresses that are available are divided into the five classes A,B,C,D and E, in which class A,B and C address are frequently used because class D is for Multicast and is rarely used and class E is reserved and is not currently used.

# data[].attributes.headline
Ali 1) In Classful addressing it divides IP address into network ID and host IDfor example Class A :- has first octet as network ID and last three octet as Host IDClass B :- has first two as network ID and last three two as Host IDClass C :- has first three as network ID and last  octet as Host ID2) Here class A,B and C are used where as class D is used for multicasting and class D for research3) Disadvantage is that it limit the number of network that can be provided to the network4) Example RIP(Routing Information Protocol) protocol uses classful addressing5) Same Subnet mask is used in complete networkClassless Addressing :-1) It allows us to use variable length subnet mask so also known as VLSM (Variable Length Subnet Mask)2) Different subnet mask used in same network.3) In this there is no boundary on host id and network id 4) Classless Addressing also known as CIDR(classless interdomain routing)5) There is no default subnet mask in classless routing.6) Example: BGP(Border Gateway Protocol),RIPv2

# data[].attributes.subject
Ali 1) In Classful addressing it divides IP address into network ID and host IDfor example Class A :- has first octet as network ID and last three octet as Host IDClass B :- has first two as network ID and last three two as Host IDClass C :- has first three as network ID and last  octet as Host ID2) Here class A,B and C are used where as class D is used for multicasting and class D for research3) Disadvantage is that it limit the number of network that can be provided to the network4) Example RIP(Routing Information Protocol) protocol uses classful addressing5) Same Subnet mask is used in complete networkClassless Addressing :-1) It allows us to use variable length subnet mask so also known as VLSM (Variable Length Subnet Mask)2) Different subnet mask used in same network.3) In this there is no boundary on host id and network id 4) Classless Addressing also known as CIDR(classless interdomain routing)5) There is no default subnet mask in classless routing.6) Example: BGP(Border Gateway Protocol),RIPv2

# data[].attributes.body
the classful addressing system  all the IP addresses that are available are divided into the five  classes A,B,C,D and E, in which class A,B and C address are frequently  used because class D is for Multicast and is rarely used and class E is  reserved and is not currently used.Each of the IP address belongs to a  particular class that's why they are classful addresses.Earlier this  addressing system did not have any name,but when classless addressing  system came into existence then it is named as Classful addressing  system.The main disadvantage of classful addressing is that it limited  the flexibility and number of addresses that can be assigned to any  device.One of  the major disadvantage of classful addressing is that it  does not send subnet information but it will send the complete network  address. The router will supply its own subnet mask based on its locally  configured subnets. As long as you have the same subnet mask and the  network is contiguous, you can use subnets of a classful network  address.

# data[].attributes.body
1) In Classful addressing it divides IP address into network ID and host ID

for example Class A :- has first octet as network ID and last three octet as Host ID

Class B :- has first two as network ID and last three two as Host ID

Class C :- has first three as network ID and last  octet as Host ID

2) Here class A,B and C are used where as class D is used for multicasting and class D for research
While,
In Classless IP Addressing
1) It allows us to use variable length subnet mask so also known as VLSM (Variable Length Subnet Mask)

2) Different subnet mask used in same network.

# data[].attributes.headline
classl : the orginal addressing format  .. classful ip packets no way yo include a custom subnet mask .

# data[].attributes.subject
classl : the orginal addressing format  .. classful ip packets no way yo include a custom subnet mask .

# data[].attributes.headline
Classful:  The original addressing format.  Class A,B,C.  They were fixed sizes, you had one or the other and that was it.  And that was what the router forwarded...classful ip packets. No way to include a custom subnet mask.

# data[].attributes.subject
Classful:  The original addressing format.  Class A,B,C.  They were fixed sizes, you had one or the other and that was it.  And that was what the router forwarded...classful ip packets. No way to include a custom subnet mask.

# data[].attributes.body
- A classful network uses IP addresses of the same network class in all its sub-networks and in addition, the same subnet mask in all the subnets (i,e if class A, all the IP addresses in the network are of class A)

------------
-  Classless networks enable the use of IP addresses with different subnet masks in the same network to enable efficient use of IP addresses

# data[].attributes.body
Classful addressing:In the classful addressing system  all the IP addresses that are available are divided into the five  classes A,B,C,D and E, in which class A,B and C address are frequently  used because class D is for Multicast and is rarely used and class E is  reserved and is not currently used.Each of the IP address belongs to a  particular class that's why they are classful addresses.Earlier this  addressing system did not have any name,but when classless addressing  system came into existence then it is named as Classful addressing  system.The main disadvantage of classful addressing is that it limited  the flexibility and number of addresses that can be assigned to any  device.One of  the major disadvantage of classful addressing is that it  does not send subnet information but it will send the complete network  address. The router will supply its own subnet mask based on its locally  configured subnets. As long as you have the same subnet mask and the  network is contiguous, you can use subnets of a classful network  address.
Classless Addressing:Classless addressing system is  also known as CIDR(Classless Inter-Domain Routing).Classless addressing  is a way to allocate and specify the Internet addresses used in  inter-domain routing more flexibly than with the original system of  Internet Protocol (IP) address classes.What happened in classful  addressing is that if any company needs more than 254 host machines but  far fewer than the 65,533 host addresses then the only option for the  company is to take the class B address.Now suppose company needs only  1000 IP addresses for its host computers then in this (65533-1000=64533)  IP addresses get wasted.For this reason, the Internet was, until the  arrival of CIDR, running out of address space much more quickly than  necessary. CIDR effectively solved the problem by providing a new and  more flexible way to specify network addresses in routers.A CIDR network  address looks like this:

# data[].attributes.body
In Classful addressing it divides IP address into network ID and host ID while in classless   there is no boundary on host id and network id
Also in classful  Same Subnet mask is used in complete network while  There is no default subnet mask in classless routing while classifull  There is no default subnet mask in classless routing

# data[].attributes.body
Classful Addressing:-

1) In Classful addressing it divides IP address into network ID and host ID

Class A :- has first octet as network ID and last three octet as Host ID

Class B :- has first two as network ID and last three two as Host ID

Class C :- has first three as network ID and last  octet as Host ID

2) Here class A,B and C are used where as class D is used for multicasting and class D for research

3) Disadvantage is that it limit the number of network that can be provided to the network

4) Example RIP(Routing Information Protocol) protocol uses classful addressing

5) Class A  :\8 as (1 octet is network ID) , Class B :-\16 , Class C : \24

6) Same Subnet mask is used in complete network

Classless Addressing :-

1) It allows us to use variable length subnet mask so also known as VLSM (Variable Length Subnet Mask)

2) Different subnet mask used in same network.

3) In this there is no boundary on host id and network id

4) Classless Addressing also known as CIDR(classless interdomain routing)

5) There is no default subnet mask in classless routing.

6) Example: BGP(Border Gateway Protocol),RIPv2