17: a new network is being designed for your company, acme, inc. if you use a class c ip network, which subnet mask will provide one usable subnet per department while allowing enough usable host addresses for each department specified in the table?

　　a. 255.255.255.0

　　b. 255.255.255.192

　　c. 255.255.255.224

　　d. 255.255.255.240

　　e. 255.255.255.248

　　18: which of these protocols provides data transport, relying on the error correction capabilities of the application itself?

　　a. udp

　　b. tcp

　　c. snmp

　　d. icmp

　　19: which of the following are used by tcp to ensure reliable delivery of data? (choose two.)

　　a. mac address resolution

　　b. sequence numbers

　　c. acknowledgments(GbbFi,tk k&dF={(GbbFi,tk k&dF={t$

　　d. ping

　　e. routing updates

　　20: you discover that you are able to adjust the window size of the tcp segment. you increase the window size to test the results. what will you observe happening on your network?

　　a. increased throughput

　　b. decreased throughput

　　c. increased latency

　　d. decreased reliability