1. Distinguish between communication at the network layer and communication at the data-link layer. 2. Distinguish between a point-to-point link and a broadcast link. 3. Which of the following is a...

1. Distinguish between communication at the network layer and communication at the data-link layer.
The communication at network layer uses host to host transformation     of the data packets. It is responsible for end to end delivery of packets. Packet routing is done through intermediate hosts. In this case, we traverse through different LANs and each of the cable has its own data link layer protocol but with the help of only single network layer protocol.
The network layer uses logical addressing and carries the address of the source and destination (Bhagwat, P., Perkins, C., & Tripathi, S.). Logical addressing helps to differentiate between the source and destination system. The main goal of the network layer is to transfer the packets from sending host to multiple receiving host at a time. It uses ARP protocol for the communication.
Node to node transformation is done for the data packets for the communication at data link layer. It is used for the communication on same local network. Data link layer allows transfer of data through the physical layer. It sends the data frames which includes necessary synchronization and tries to find the errors and loss of signal if occurs. An example for this communication can be an ethernet LAN (Leon-Garcia, A., & Widjaja, I). It works with the physical addressing. It works with two nodes which are directly connected with each other. The direct connection can be for point to point link or broadcast. The communication channel which is used to connect the adjacent nodes is known as links. A datagram is moved from across an individual link in order to move...