A. With a network wide mask of 255.255.255.128, each interface does not require an IP address.
B. With a network wide mask of 255.255.255.128, each interface does require an IP address on a unique IP subnet.
C. With a network wide mask of 255.255.255.0, must be a Layer 2 device for the PCs to communicate with each other.
D. With a network wide mask of 255.255.255.0, must be a Layer 3 device for the PCs to communicate with each other.
E. With a network wide mask of 255.255.254.0, each interface does not require an IP address.
Answer: BDE
Explanation:
If Subnet Mask is 255.255.255.128 the hosts vary from x.x.x.0 - x.x.x.127 & x.x.x.128- x.x.x.255,so the IP Addresses of 2 hosts fall in different subnets so each interface needs an IP an address so that they can communicate each other.
If Subnet Mask is 255.255.255.0 the 2 specified hosts fall in differnt subnets so they need a Layer 3 device to commicate.
If Subnet Mask is 255.255.254.0 the 2 specfied hosts are in same subnet so are in network address and can be accomidated in same Layer 2 domain and can communicate with each other directly using the Layer 2 adddress.
sorry your explain not clear ..
ReplyDeleteyes, The explanation is not very clear
ReplyDeleteIt should have been more detailed.
Thanks a lot
OMG, Explanation can't be clearer than this. If you don't understand, I recommend both of you to take networking 101.
ReplyDeleteSorry to be harsh on both of you but who ever wrote it, did a good job.
*10.1.0*.36 | 10.1.1.70 (according to the subnet mask *255.255.255*.128 , we can see two hosts go in to differnt subnets because x.x.0.36 & x.x.1.70 (first 3 should be same ,but here it's not )so we need
ReplyDeleteeach interface does require an IP address on a unique IP subnet. (B) correct
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because of the same reason (255.255.255.0) again we need a layer 3 device such as router to communicate with in different subnets so (D)correct
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with a network wide mask of 255.255.254.0 first 2 octet same x.x.254.0 .which means now the two hosts in same subnets because (10.1 & 10.1) so we don't need layer 3 device to communicate.and no need any configuration changes (a ip address).they can communicate each other because there in the same subnets .so (E) correct
A C Wrong
This is perfect explanation, can't be more specific that this...... Thank you.
ReplyDeleteexcellent as I understand. And they do not understand should review the ccna again.
ReplyDeleteAnswer: B D E
ReplyDeleteExplanation
The principle here is if the subnet mask makes two IP addresses 10.1.0.36 and 10.1.1.70 in the same subnet then the Network device A does not need to have IP addresses on its interfaces (and we don’t need a Layer 3 device here).
A quick way to find out the correct answers is notice that all 255.255.255.x subnet masks will separate these two IP addresses into two separate subnets so we need a Layer 3 device here and each interface must require an IP address on a unique IP subnet -> A, C are not correct while B, D are correct.
With 255.255.254.0 subnet mask, the increment here is 2 in the third octet -> the first subnet is from 10.1.0.0 to 10.1.1.255, in which two above IP addresses belong to -> each interface of Network device A does not require an IP address -> E is correct.
Awww Thanks dude. You're a life saver man! Couldn't be better explained than this. All those who don't understand should go through this explanation
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