# Network Layer And Data Link Layer

## Homework Statement

If the network layer is sending a message from A to D via B, it can be sure that a message sent by the data link layer from A to B will always arrive at B, and from B to D will always get to D. How is it possible for the network layer not to be able to correctly deliver a message from A to D.

Assume this 4-node network:

A---B----D
|.....|......|
|---C ----|

ignore the periods!!! Basically A is connected with B and C; B is connected with A, C and D; C is connected with A, B, D; D is connected with B and C

## The Attempt at a Solution

I am not sure about this one. Could it be if the two nodes arent using the same addressing scheme? Any help would be appreciated.

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Network layer is basically used when we send data from one network to another,... It usually involves routers etc.

for sending data within one network, data link layer is used.

Network layer is basically used when we send data from one network to another,... It usually involves routers etc.

for sending data within one network, data link layer is used.