
Let’s review some of the terminology used in this textbook. Recall that the name of a transport-layer packet is segment and that the name of a link-layer packet is frame. What is the name of a network-layer packet? Recall that both routers and link-layer switches are called packet switches. What is the fundamental difference between a router and link-layer switch?

Link Layer:
Link layer is the aggregation of procedures and protocols used in a link to share the data between the nodes. It includes mainly three functions namely, detection of transmission errors, regulation of data flow and provides well-structured interface.
Explanation of Solution
Description of network layer packet:
- Network layer is provides the path in which the data packets are transferred from the source to the destination.
- It also helps in converting the logical or Internet Protocol (IP) address to physical or Media Access Control (MAC) address.
- The packet related to network layer can be termed as datagram.
Differences between router and link layer switch:
Router | Link layer switch |
The router process in the internet protocol is done by network layer, link layer and physical layer. In latest routers, transport layer is also included. |
The link layer switch process is done using data link layer and physical layer. |
A router transmits the data packet using IP layer address. | A link layer transmits the data frames using MAC layer address. |
In router, the data in transmitted in the form of packets or data packets. | In link layer switch, the data is transmitted in the form of frames or data frames. |
It is used in Local Area Network (LAN), Wide Area Network (WAN) and Metropolitan Area Network (MAN). | It is used in LANs only. |
In this, the data is transmitted in full duplex mode. | In this, the data is transmitted in both full duplex and half duplex modes. |
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