1 What is the fundamental difference between network layer and datalink layer

1
1- What is the fundamental difference between
network layer and data-link layer?
Data-link layer only deals with efficient
transmission of information between adjacent
machines in the network that are directly
connected to each other. Network layer, which
employs the services of the data-link layer,
provides end-to-end connectivity between machines
that are not necessarily directly connected.
2- What is the task that is unique to the network
layer?
Routing is the task that is unique to the network
layer. Because the network layer is the lowest
layer that has to deal with end-to-end
transmission, routing must be performed at this
layer.
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3- Complete the switching table for SW1.
D
A
SW1
2
1
3
3
C
1
2
SW3
SW2
1
Switching table for SW1
2
B
3
4- Based on the switching tables at SW1 and SW3,
what path does the traffic from host B follow?
D
A
SW1
2
1
3
3
C
1
2
SW3
SW2
1
Switching table for SW3
Switching table for SW1
2
B
4
5- Based on the switching tables at SW1 and SW3,
what path does the traffic from host B follow?
D
A
SW1
2
1
3
3
C
1
2
SW3
SW2
1
Switching table for SW3
Switching table for SW1
2
B
5
6- Compare datagram routing and virtual circuit
switching ?
6
7- Consider the network depicted below. Using
Dijkstras Algorithm find out the shortest path
to each destination node from node A. In what
order will the nodes be set permanent by the
Dijkstras Algorithm?
A
D
2
4
1
5
3
C
6
2
B
2
F
3
E