4. (4 points) a) A client computer opens an FTP client program and starts downlo

Question

4. (4 points) a) A client computer opens an FTP client program and starts downloading certain files from an FTP server. While the download is in progress, the user opens his web browser and starts surfing the web. What does the client computer use to know where to direct incoming packets (the FTP program or the web browser)? (choose one) - Sequence numbers - Port numbers -IP Addresses MAC Addresses b) Which of the following methods helps to detect lost packets? (choose two) - Sequencing - CRC Acknowledgements - Buffering Congestion control c) When a PC is sending a packet to the default gateway, it needs the MAC address of that default gateway. The PC first checks the ARP cache table. If the IP address of the default gateway is found in the table, the PC broadcasts an ARP request. (True or False) - True - False

Explanation / Answer

4 a) Port numbers

The port numbers uniquely identify the application that is running in machine to which the incoming packets need to be redirected. These port numbers are included in these packets.

4 b) Sequencing and Acknowledgements

Sequencing and Acknowledgements help to identify the sequence of the incoming packets and also help to identify any missing messages.

4 c) False

If the IP Address of the default gateway is in ARP cache, the PC will not broadcast a new ARP request.
If the IP address is missing or if the entry is expired, only then the PC will broadcast a new ARP request.

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