Network Layer And Data Link Layer

[wany]

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

Homework Equations

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.

 

[DirectCurrent]

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.

 

[DirectCurrent]

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.