Sybex Intro 5th edition subnetting typo?
Knives Out
Member Posts: 91 ■■□□□□□□□□
in CCNA & CCENT
Hi there - I'm doing the Ch 3 written labs in Lammle's 5th edition CCNA Intro and encountered this question.
Written Lab 3
What is the subnet, broadcast and valid host range for:
#3. 192.168.100.66 /27
/27 = 255.255.255.224
256-224= 32
subnets (increments) should be 192.168.100.0 (and .32, .64, .96 etc)
So basically I have my answer as:
subnet of where host address resides: 192.168.100.64
valid hosts: 192.168.100.65 to .94
broadcast: 192.168.100.95
The book has the answer as:
/27 is 255.255.255.224. Fourth octet is a block size of 32. Count by 32s until you pass the host address of 66. 0, 32, 64. The host is in the .32 subnet, broadcast of 63. Valid host range is 33-62.
This has to be a typo but just want to confirm I'm not seeing things
Written Lab 3
What is the subnet, broadcast and valid host range for:
#3. 192.168.100.66 /27
/27 = 255.255.255.224
256-224= 32
subnets (increments) should be 192.168.100.0 (and .32, .64, .96 etc)
So basically I have my answer as:
subnet of where host address resides: 192.168.100.64
valid hosts: 192.168.100.65 to .94
broadcast: 192.168.100.95
The book has the answer as:
/27 is 255.255.255.224. Fourth octet is a block size of 32. Count by 32s until you pass the host address of 66. 0, 32, 64. The host is in the .32 subnet, broadcast of 63. Valid host range is 33-62.
This has to be a typo but just want to confirm I'm not seeing things
Comments
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Knives Out
Member Posts: 91 ■■□□□□□□□□
Thanks, I've been pounding subnetting into my head for a couple of days now and feared I had some sort of bad tunnel vision.
Thanks for the fresh set of eyes -
mikej412
Member Posts: 10,086 ■■■■■■■■■■
It looks like a known "bug" -- Good catch!
http://www.wiley.com/WileyCDA/WileyTitle/productCd-0470068507,descCd-ERRATA.html:mike: Cisco Certifications -- Collect the Entire Set!
