You have it backwards. In wildcard masks 0 means "it must be" and 1 means " I don't care"
On Fri, Mar 5, 2010 at 2:33 PM, Mustafa Yadav <[email protected]>wrote: > I understood from here 255.255.254.255 is wildcard mask and normally it > means 0.0.1.0 . > > 1 means I do care that bit and 0 means I do not care.Since 1 isd the least > significant bit and in the network portion is zero ,having 0 in the that > bit is a must. > > Is my understanding correct? > > On Fri, Mar 5, 2010 at 9:07 PM, Joe Astorino <[email protected]>wrote: > >> The access-list you have below will only allow networks with an even third >> octet. Since it denies everything else, that would work. >> >> The logic here is that the least significant bit of the third octet must >> be equal to a 0. Therefore, only evens are permitted since all even >> networks end with a 0. >> >> On Fri, Mar 5, 2010 at 2:02 PM, Mustafa Yadav >> <[email protected]>wrote: >> >>> hi all, >>> I have read in one question asked do not want odd in third octet .I am >>> not pretty sure about the answer but it was something like below.Can someone >>> clarify the llogic behind it? >>> >>> access-list 1 permit 0.0.0.0 255.255.254.255 >>> >>> _______________________________________________ >>> For more information regarding industry leading CCIE Lab training, please >>> visit www.ipexpert.com >>> >>> >> >> >> -- >> Regards, >> >> Joe Astorino CCIE #24347 (R&S) >> Sr. Technical Instructor - IPexpert >> Mailto: [email protected] >> Telephone: +1.810.326.1444 >> Live Assistance, Please visit: www.ipexpert.com/chat >> eFax: +1.810.454.0130 >> >> IPexpert is a premier provider of Classroom and Self-Study Cisco CCNA >> (R&S, Voice & Security), CCNP, CCVP, CCSP and CCIE (R&S, Voice, Security & >> Service Provider) Certification Training with locations throughout the >> United States, Europe and Australia. Be sure to check out our online >> communities at www.ipexpert.com/communities and our public website at >> www.ipexpert.com >> >> >> > -- Regards, Joe Astorino CCIE #24347 (R&S) Sr. Technical Instructor - IPexpert Mailto: [email protected] Telephone: +1.810.326.1444 Live Assistance, Please visit: www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Classroom and Self-Study Cisco CCNA (R&S, Voice & Security), CCNP, CCVP, CCSP and CCIE (R&S, Voice, Security & Service Provider) Certification Training with locations throughout the United States, Europe and Australia. Be sure to check out our online communities at www.ipexpert.com/communities and our public website at www.ipexpert.com
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
