State for each part below, which layer of the TCP/IP five layer model does the following?

a. Responsible for transmitting and receiving signals

b. MAC addresses used to determine what device should read the frame. Ensures a large file that was sent as a bunch of packets puts the packets back together in their proper order.

c. Provides host to host communication on different networks

d. A hub is used to connect multiple machines on the same LAN

e. Transmits a packet through a router between networks

f. Adds IP addresses and encapsulates segments or datagrams in packets

g. Provides the first formal level of error detection for transmission errors

h. Skype is an application that use a Voice Over Internet Protocol

i. Transports 0s and 1s via fiber optic cables