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

4. (4 points) a) A client computer opens an FTP client

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

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