Refer to the exhibit.
Which three statements correctly describe Network Device A? (Choose three.)
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.
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 different subnets so they need a
Layer 3 device to communicate.
If Subnet Mask is 255.255.254.0 the 2 specified hosts are in same subnet so are in network
address and can be accommodated in same Layer 2 domain and can communicate with each
other directly using the Layer 2 address.
D: It should be a router.
Answer: B D E
*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
each interface does require an IP address on a unique IP subnet. (B) correct
——————————————–
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
——————————————-
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
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