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READ Free Dumps For Cisco- 200-125





Question ID 15979

Refer to the exhibit.

Which three statements correctly describe Network Device A? (Choose three.)

Option A

With a network wide mask of 255.255.255.128, each interface does not require an IP address.

Option B

With a network wide mask of 255.255.255.128, each interface does require an IP address on a unique IP subnet. 

Option 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.

Option 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.

Option E

 With a network wide mask of 255.255.254.0, each interface does not require an IP address.

Correct Answer B,D,E
Explanation 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.


Question ID 15980

For what two purposes does the Ethernet protocol use physical addresses? (Choose two.)

Option A

to uniquely identify devices at Layer 2

Option B

to allow communication with devices on a different network

Option C

to differentiate a Layer 2 frame from a Layer 3 packet

Option D

to establish a priority system to determine which device gets to transmit first

Option E

to allow communication between different devices on the same network

Option F

 to allow detection of a remote device when its physical address is unknown

Correct Answer A,E
Explanation Explanation: Physical addresses or MAC addresses are used to identify devices at layer 2. MAC addresses are only used to communicate on the same network. To communicate on different network we have to use Layer 3 addresses (IP addresses) -> B is not correct. Layer 2 frame and Layer 3 packet can be recognized via headers. Layer 3 packet also contains physical address ->. On Ethernet, each frame has the same priority to transmit by default ->. All devices need a physical address to identify itself. If not, they cannot communicate ->.

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