Subnetting - Phone Screen
Brain_Power
Users Awaiting Email Confirmation Posts: 163
in CCNA & CCENT
I just had a phone screen for a network engineer position.
Here was 2 of the questions:
How many host addresses are available in 10.15.1.255 with a subnet of 255.0.0.0
What is the broadcast address for 10.1.0.0 with a subnet of 255.255.255.0
Post your answers please, so we can discuss.
Here was 2 of the questions:
How many host addresses are available in 10.15.1.255 with a subnet of 255.0.0.0
What is the broadcast address for 10.1.0.0 with a subnet of 255.255.255.0
Post your answers please, so we can discuss.
Comments
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MAC_Addy
Member Posts: 1,740 ■■■■□□□□□□
Easy, 16 million hosts on that subnet.
Broadcast, 10.1.0.255.2017 Certification Goals:
CCNP R/S -
johnifanx98
Member Posts: 329
Brain_Power wrote: »I just had a phone screen for a network engineer position.
Here was 2 of the questions:
How many host addresses are available in 10.15.1.255 with a subnet of 255.0.0.0
What is the broadcast address for 10.1.0.0 with a subnet of 255.255.255.0
Post your answers please, so we can discuss.
hey, buddy, when did you get your CCNA certified?
BTW, the first question looks odd. 10.15.1.255 is not a network address... -
oli356
Member Posts: 364
It is an address with that subnet mask though.
10.0.0.1 - 10.255.255.254 is the host range.Lab:
Combination of GNS3 and Cisco equipment if required. -
Brain_Power
Users Awaiting Email Confirmation Posts: 163
johnifanx98 wrote: »hey, buddy, when did you get your CCNA certified?
Did I give a wrong answer? NO Did I say that I could not answer these questions? NO
Where is your CCNA? exactly...go back to your developer forums...bro no need for smart ass comments here!
However, looks like you failed to provide a quality answer! -
RouteMyPacket
Member Posts: 1,104
Brain_Power wrote: »I just had a phone screen for a network engineer position.
Here was 2 of the questions:
How many host addresses are available in 10.15.1.255 with a subnet of 255.0.0.0
What is the broadcast address for 10.1.0.0 with a subnet of 255.255.255.0
Post your answers please, so we can discuss.
Even asking such a question IMO is ridiculous. I immediately knew the answer to the second question, but the first I would of had no clue off the top of my head. In the real world, just use an IP Calc
How did you answer if you don't mind me asking? I'd have simply stated "Ok, second question..that's a /24..broadcast will be 10.1.0.255...now as to the first question..I don't know off the top of my head, a ton" then laughed.
They must have asked such a question just to guage your response, I generally ask certain questions when hiring simply to hear the reaction and response, I assume this to be the same.Modularity and Design Simplicity:
Think of the 2:00 a.m. test—if you were awakened in the
middle of the night because of a network problem and had to figure out the
traffic flows in your network while you were half asleep, could you do it? -
4_lom
Member Posts: 485
Brain_Power wrote: »Did I give a wrong answer? NO Did I say that I could not answer these questions? NO
Where is your CCNA? exactly...go back to your developer forums...bro no need for smart ass comments here!
However, looks like you failed to provide a quality answer!
He has a valid point Brain_Power.... While his execution of it may have been a bit "jerkish", it is expected that anyone with a CCNA would be able to figure out those questions. No offence, of course.Goals for 2018: MCSA: Cloud Platform, AWS Solutions Architect, MCSA : Server 2016, MCSE: Messaging -
NetworkVeteran
Member Posts: 2,338 ■■■■■■■■□□
I like these questions. Some room for errors and for determining if a candidate is strong, okay, or clueless in the realm of subnetting.RouteMyPacket wrote: »Even asking such a question IMO is ridiculous.
I would personally characterize that as "okay" and 16 million or (2^24)-2 as "strong".I don't know off the top of my head, a ton" then laughed.
In the real world, someone who relies on an IP Calculator to answer such questions will be either slower or more error-prone than a stronger engineer. What do you do when you can't connect to the Internet, or you have a customer in front of you? Interestingly, I remember this same debate in the school system. "Why do kids need to learn multiplication when there are calculators?"In the real world, just use an IP Calc -
MAC_Addy
Member Posts: 1,740 ■■■■□□□□□□
Yes it is. With a /8 you can you can have that as a valid host address.johnifanx98 wrote: »BTW, the first question looks odd. 10.15.1.255 is not a network address...2017 Certification Goals:
CCNP R/S -
oli356
Member Posts: 364
Calm down..Brain_Power wrote: »Did I give a wrong answer? NO Did I say that I could not answer these questions? NO
Where is your CCNA? exactly...go back to your developer forums...bro no need for smart ass comments here!
However, looks like you failed to provide a quality answer!
The "Post your answers please, so we can discuss." in my opinion made me think you didn't know. You can't discuss this as there is only 1 correct answer for each question.Lab:
Combination of GNS3 and Cisco equipment if required. -
johnifanx98
Member Posts: 329
Brain_Power wrote: »Did I give a wrong answer? NO Did I say that I could not answer these questions? NO
Where is your CCNA? exactly...go back to your developer forums...bro no need for smart ass comments here!
However, looks like you failed to provide a quality answer!
Brain power, I have no intent to offend at all. I'm just joining the discussion and add some color in my way...
