#44366: The show 642 813 exams just an injury ---------------------------+-------------------------------- Reporter: manjammehta@… | Owner: macports-tickets@… Type: defect | Status: new Priority: Normal | Milestone: Component: ports | Version: 2.3.1 Keywords: 642-813 | Port: ---------------------------+-------------------------------- The number of nodes her network you're limited to one through 254 and the node portion of the address gives you 254 node addresses because 255 issues for broadcasters you’re more limited on the number I've noted dresses get but there are act on Class C network address is out there the last two 224 the 239 multi casting which is what a multicast is an IP are abroad type of broadcasts not necessary broadcast Coast everybody a multicast goes to a group nodes that are listening for messages one particular multicast address like OSPF on a router sends out its all spy updates it sends them the multicast addresses to 24 to 0 to 0 about 5 and all the other routers are listening for those multicast updates on tatty 4005 a good example multicast address news in class P is used for research that's240 in a but those are the basic class boundaries and you should be comfortable with these because that's going to tell us something because if I have a twelve-year and I'm using this subnet mask that means I've got whole bunch of subnets I've got a thing at sixty-five [http://642-813dump.com/ 642-813] thousand plus some that site got here if I'm using a Class C network address sick 2001 and I'm using the same subnet mask I don't have any sudden it's because class C uses the first three octets for network portion Class AA only uses the first octet for network that way when I is a classy address I get two octets subnets classy address I don't get any summits at this mass because this is the default mask that's my starting point so it's very important to build the look the first number in an address build termini what class at the party because that tells you what the starting point was for the subnet mask how many potential summit you have based on the new subnet mask let's go back to that said noting that we were doing are actually going to subnet something Council hearing or we were and a network with 11 all the way up to 11 subnets were using the network address 12 000 which is a Class A which is slashing are255 does /urn does /urn as a rock and when I’m going to need to deal with the seven masses are many change it from because with the 12. http://642-813dump.com/ -- Ticket URL: <https://trac.macports.org/ticket/44366> MacPorts <http://www.macports.org/> Ports system for OS X