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  • cisco - Confusing A, B, C network classes - Network Engineering Stack . . .
    The second set of networks you list are from RFC1918, and define private use address ranges There is a single 8 network within the former class A space (giving a single class A network), a 12 within the former class B space (giving 16 class B networks), and a 16 within the former class C space (giving 256 class C networks)
  • Determining the network class of an IP address [duplicate]
    Class A The first octet denotes the network address, and the last three octets are the host portion Any IP address whose first octet is between 1 and 126 is a Class A address Note that 0 is reserved as a part of the default address, and 127 is reserved for internal loopback testing
  • How do you calculate the prefix, network, subnet, and host numbers?
    Given, for example, a 10 11 12 0 24 network, many people incorrectly call that a Class C network because of the 24 network mask, even though the first bit of the address is 0, making it is a Class A network, albeit with a longer network mask than the default Class A network mask, meaning it is a subnet of a Class A network, not a Class C network
  • ipv4 - How dangerous is Class E, really? - Network Engineering Stack . . .
    First, network address classes are dead, so there is really no Class E You must mean the 240 0 0 0 4 address range, which is Reserved by IANA You could possibly use addressing in that range for experimental purposes on a network, with the caveat that there are applications and devices that refuse to work with addressing in that range
  • Usage of 192. 168. xxx, 172. xxx and 10. xxx in private networks
    Accessing public network from a private network requires the use of NAT (Network Address Translation) which modifies the private IP packet headers when they transit from private to a public network across a routing device that will perform the NAT translation to the public network A routing device can be a firewall, router or Layer 3 switch
  • Does CIDR really do away with IP address classes?
    A Class C network cannot be a subset of a Class B network, because the top bits cannot match both Your hypothetical organization with 3 Class C networks would have to pay attention to which computers got addresses in which of the 3 networks With CIDR routing, they can use a netmask that allows all of their computers to be in the same subnet
  • Public vs Private IP addresses - Network Engineering Stack Exchange
    Public and private IPv4 networks are often separated by a Network Address Translation (NAT) boundary A NAT boundary is simply a network device (often the router) that effectively hides the source IP So in the case above the IP address the server at 34 201 21 54 would see is a NAT'd IP, not the original 10 1 1 12 IP
  • Why we use 224 as multicast address in many protocols? - network
    This is what RFC 870 had to say about class D originally: Class D (highest-order bits 1-1-1) All addresses in this class are reserved for future use, possibly in support of multicast services They should be allocated to R D use for the present This definition was updated in RFC 1166: The fourth type of address, class D, is used as a multicast
  • Why Classful addressing is not in use if we can subnet them?
    A company needing only 300 addresses would need to be assigned a Class B network (65,536 addresses) under classful routing, wasting over 99% of the addresses in the network class With CIDR, the company could be assigned a 23 network, regardless of the initial network bits (part of an old Class A or B network, or an aggregated pair of old
  • subnet - Difference between network and subnetwork - Network . . .
    When there were network classes, any network with a mask length longer than the class default mask length was a subnet of the network Since CIDR, a subnet is any network with a mask length longer than a network of which it is part The term network can be applied to any subnet Technically, any network is a subnet of 0 0 0 0 0 Today, the





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