Ip addressing question

2001-01-25 Thread John lay
Guys, While I am studying for the BSCN, I found the following question concerning IP addressing: Assuming your clients do not support subnet-zero, how many of your class C addresses are wasted by using the subnet mask of 255.255.255.192 and not using VLSM? a. 10% b. 25% c. 50% d.

Ip addressing question

2001-01-25 Thread IST . EPNL-CT-PPC-DAT
>From the subnet mask, you will get four subnets and they are .0 network .64 network .128 network and .192 network. If you are not going to make use of ip subnet-zero command, then you will be wasting 1/4 of the ip addresses since the 0 network won't be used which equals 25% of the total address a

Ip addressing question

2001-01-25 Thread Fred Danson
Could anyone explain to me why Subnet zero and the last subnet are not normally used?? I see why 2 host addresses are reserved in every subnet (network address and broadcast address), but I never understood why 2 networks are not used. What is the difference between these networks and the

RE: Ip addressing question

2001-01-25 Thread Jennifer Cribbs
Subnet zero is the network address that the routers uses for routing to the network and the broadcast address sends a broadcast to the entire network everytime it is used, which means it goes to all subnets. Therefore, these are not used as host addresses. They encompass the whole network. O

RE: Ip addressing question

2001-01-25 Thread Howard C. Berkowitz
>Subnet zero is the network address that the routers uses for routing to the >network and the broadcast address sends a broadcast to the entire network >everytime it is used, which means it goes to all subnets. Therefore, these >are not used as host addresses. They encompass the whole network.

RE: Ip addressing question

2001-01-25 Thread Frank Wells
ibbs <[EMAIL PROTECTED]> >To: [EMAIL PROTECTED] >Subject: RE: Ip addressing question >Date: Thu, 25 Jan 2001 10:38:38 -0500 > >Subnet zero is the network address that the routers uses for routing to the >network and the broadcast address sends a broadcast to the entire networ

Re: Ip addressing question

2001-01-25 Thread Gareth Hinton
; only to its entire sub-network. Referring to our example once more, this > would be the address 172.16.4.7 and only the two host addresses on the > subnet would hear a broadcast from it. > > Hope this clarifies things. > > > > >From: Jennifer Cribbs <[EMAIL PROTECTED]&g

RE: Ip addressing question

2001-01-25 Thread Gary Jackson
ess 172.16.4.7 and only the two host addresses on the >subnet would hear a broadcast from it. > >Hope this clarifies things. > > > > >From: Jennifer Cribbs <[EMAIL PROTECTED]> > >Reply-To: Jennifer Cribbs <[EMAIL PROTECTED]> > >To: [EMAIL PROTECTED

Re: Ip addressing question

2001-01-25 Thread Neil Schneider
e, they will merely recognize it and route it. The > > broadcast address in a subnet does not see the entire network, it > broadcasts > > only to its entire sub-network. Referring to our example once more, this > > would be the address 172.16.4.7 and only the two host addresses on t

Re: Ip addressing question

2001-01-25 Thread Gareth Hinton
ch is not taken up by the subnets. > > In > > > our example this would be 172.16.4.1;172.16.4.2;172.16.4.3 > > > Routers do not use subnet zero for anything unless instructed to do so > and > > > if this is the case, they will merely recognize it and route i

Re: Ip addressing question

2001-01-25 Thread Frank Wells
> > > > > > 172.16.4.5 and 172.16.4.6 > > > > > > > > Subnet zero is that address space which is not taken up by the >subnets. > > > In > > > > our example this would be 172.16.4.1;172.16.4.2;172.16.4.3 > > > > Routers do no

Re: Ip addressing question

2001-01-25 Thread Roger Dellaca
the case, they will merely recognize it and route it. The > > broadcast address in a subnet does not see the entire network, it > broadcasts > > only to its entire sub-network. Referring to our example once more, this > > would be the address 172.16.4.7 and only the two host a

Re: Ip addressing question

2001-01-25 Thread Jack
Ok, so subnet zero is not usable, I understand that. Is the last subnet usable even though it contains the 255 portion of the address? >What subnets to we get from this combo?... >First subnet= 172.16.4.4 >Second subnet= 172.16.4.8 >Third subnet= 172.16.4.12 >... >Last subnet= 172.16.4.252

Re: Ip addressing question

2001-01-25 Thread Groupstudy
Yes it is. The 172.16.4.255 ip address would be the 172.16.4.252 subnet broadcast address though. - Original Message - From: Jack <[EMAIL PROTECTED]> Newsgroups: groupstudy.cisco To: <[EMAIL PROTECTED]> Sent: Thursday, January 25, 2001 6:41 PM Subject: Re: Ip addressing que

Re: Ip addressing question

2001-02-01 Thread Daniel Fey
RFC 950 was the original subnetting rule that did not allow the use of subnet zero. The new RFC 1812 does allow the use of subnet zero. This assumes that you are using a routing protocol that is aware of the difference between 131.107.0.0/16 and 131.107.0.0/17.