1. It is not possible for two TCP segments with source port 80 to be sent by different processes at the sending host

a. true

b. false

2. link-layer addresses are actually assigned to

a. network adapters

b. hosts

c. routers

d. hosts and routers

3. network layer is implemented in _________

a. ethernet switches

b. hosts and routers

c. routers

d. hosts

4. Computing the contents of the forwarding table is the action taken in _______ of network layer

a. data plane and control plane

b. it is not the function of network layer

c. data plane

d. control plane

5. looking up the address bits in arriving datagram header in the forwarding table is the action taken in _______ of network layer

a. control plane

b. data plane and control plane

c. it is not the function of network layer

d. data plane

6. A physical address is _______ longer

a. 8 bytes

b. 6 bytes

c. 4 bytes

d. 16 bytes