Hot Downloads

Welcome, Guest
Username: Password: Remember me

TOPIC: cisco question minus 2 on Networks and Hosts?

cisco question minus 2 on Networks and Hosts? 9 years 6 months ago #21741

  • pal
  • pal's Avatar
  • Offline
  • New Member
  • Posts: 3
  • Karma: 0
Hello I really like your subnetting tutorials it gots the clearest and easiest explanations, but I got a question I am new to subnetting and on my cisco academy books ccna1 they always minus two from the networks and the Hosts, on your examples you don't why is that :? . Thanks

Pal
The administrator has disabled public write access.

Re: cisco question minus 2 on Networks and Hosts? 9 years 6 months ago #21742

  • Smurf
  • Smurf's Avatar
  • Offline
  • Moderator
  • Posts: 1390
  • Karma: 1
If you take a look half way down this page in the subnetting tutorial it does state the -2 rule http://www.firewall.cx/ip-subnetting-mask-bits.php
Wayne Murphy
Firewall.cx Team Member
www.firewall.cx

Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.
The administrator has disabled public write access.

Re: cisco question minus 2 on Networks and Hosts? 9 years 6 months ago #21747

  • pal
  • pal's Avatar
  • Offline
  • New Member
  • Posts: 3
  • Karma: 0
Hello thanks for the fast reply, yes it say minus two but only on the Host portion because of the two reserved IP's network and the broadcast address. 2^h-2 where h is hosts

On my ccna1 book it says on subnetting 2^s-2 and 2^h-2 where is is subnets and h is hosts ? so i have to add an additional bit because of the - 2 on the subnets ? :?
The administrator has disabled public write access.

Re: cisco question minus 2 on Networks and Hosts? 9 years 6 months ago #21748

  • pal
  • pal's Avatar
  • Offline
  • New Member
  • Posts: 3
  • Karma: 0
Thanks anyways, I found a note on my ccna1 book saying that 2^s-2 on subnets and 2^h-2 for hosts apply to classful-networks, on classless networks 2^h-2 are only in effect.
The administrator has disabled public write access.
Time to create page: 0.075 seconds

CCENT/CCNA

Cisco Routers

  • SSL WebVPN
  • Securing Routers
  • Policy Based Routing
  • Router on-a-Stick

VPN Security

  • Understand DMVPN
  • GRE/IPSec Configuration
  • Site-to-Site IPSec VPN
  • IPSec Modes

Cisco Help

  • VPN Client Windows 8
  • VPN Client Windows 7
  • CCP Display Problem
  • Cisco Support App.

Windows 2012

  • New Features
  • Licensing
  • Hyper-V / VDI
  • Install Hyper-V

Linux

  • File Permissions
  • Webmin
  • Groups - Users
  • Samba Setup