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Home > Archive > CCNA > December 2001 > Subnetting
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| bfattima 2001-12-18, 9:36 pm |
| HI
Can any one help
2- If a router has a serial interface S0, with IP address 107.85.20.2, using a subnet mask of 255.255.255.240, what is the broadcast address used for hosts on this subnet?
A- 107.85.20.15
B- 107.85.20.255
C- 107.85.255.255
D- 107.255.255.255
1- A router received a packet with a destination address of 172.16.14.228 assuming a subnet mask of 255.255.248.0 what is the subnet network address for the destination host?
A- 172.16.1.0
B- 172.16.4.0
C- 172.16.8.0
D- 172.16.12.0 | |
| chodan 2001-12-18, 9:47 pm |
| first "top" Question = answer A:
second "bottom" Question = answer c:
Chodan | |
| bfattima 2001-12-19, 9:02 am |
| quote:
Originally posted by chodan
first "top" Question = answer A:
second "bottom" Question = answer c:
Chodan
what is your explenation i just want to understand this subject, i can do subnetting but when they give this kind of question i'm lost
Thank you | |
| chodan 2001-12-19, 12:03 pm |
| Look at it this way.
Since a .240 subnet mask on the last octet will provide 16 addresses and the first subnet starts with .0 the broadcast address will be .15 as 2 is within that range.
That help?
You can use binary "anding" that is comparing the subnet mask to the address
that is 1 and 1 = 1, 1 and 0 = 0,
0 and 0 = 0.
All 0`s = the network address
All 1`s = the broadcast. |
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