Benjamin wrote: > Hi Andy, > > On Tue, May 19, 2009 at 3:32 PM, Andy Goldschmidt > <[email protected] > <mailto:[email protected]>> wrote: > > In this topic : > 109.1 Demonstrate an understanding of network masks > > Does that mean we need to know what a class A, B and C network is ? > e.g. Class C is 255.255.255.0 or /24 > > Should we know that in CIDR /25 equals to netmask 255.255.255.128 ? > > > Do we need to be able to work out the Network Address if we are > given the IP and Netmask ? > What about working out the Broadcast address ? > The above involves converting to binary and then doing addition > etc to work out the answer. > > > I would say yes to all the question. Those are quite common tasks for a > network administrator. You can also add: find the number of IP available > for a given mask.
I want to add my support for the "yes" answer - network admins most certainly ought to understand CIDR. Sadlly, too many don't. <rant-on> I've just come off a project in which the network admin set up countless VLANs and used very expensive managed switches because he did not understand CIDR. He used a /12 netmask for and a common network address for a large multi-site organization. VLANs were the bandage he used to make it work. This is not the only organization I have done work for where the admins did not understand the basics of TCP/IP network routing and CIDR. </rant-on> Cheers, John T. > Note: 255.255.255.0 or /24 does not imply class C, you have to check > the first bit(s) of the IP to know the class. > > Regards, > Benjamin > > > ------------------------------------------------------------------------ > > _______________________________________________ > lpi-examdev mailing list > [email protected] > http://list.lpi.org/cgi-bin/mailman/listinfo/lpi-examdev _______________________________________________ lpi-examdev mailing list [email protected] http://list.lpi.org/cgi-bin/mailman/listinfo/lpi-examdev
