A computer network is a set of computers sharing resources located on or

provided by network nodes. The computers use common communication protocolsoverdigitalinterconnectionsto communicate with each other. These interconnections are made of telecommunication network technologies, based on physically wired, optical, and wireless radio-frequency methods that may be

arranged in a variety of network topologies.

1. In Figure 1, computer A sends a message to computer D via LAN1, router R1, and LAN2. Show the contents of the packets and frames at the network and data link layer for each hop interface 2. What are the data flow functions, services and protocols at each layer of TCP/IP layers, while sending the data from computer A to computer D? (You may attach drawing for clarifications)

3. Explain the role of protocols and standards organizations in facilitating interoperability in network communications. 4. Discuss the TCP connections needed in FTP.

5. What is the function of SMTP used by the email server? 6. What is the difference between a port address, a logical address, and a physical address?

7. How do the layers of the Internet model correlate to the layers of the OSI model? 8. In Figure 1, computer F sends a message to computer E using IEEE 802.11a standard. a. What is the maximum Data Rate and the approximate indoor diameter range? b. What is the methodology of the collision avoidance with drawing? c. What is the content of the address frame?

Figure 1