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12: you are using an application on your windows 2000 client machines that provides error correction. you need a protocol to provide fast transport. which protocol should your application use?
a. tcp
b. ip
c. udp
d. spx
e. appletalk
    13: when using tcp, after a session is open, the applications can adjust the number of segments they receive before sending an acknowledgment. this behavior is known as ______.
a. mtu adjustment
b. windowing
c. flexible send path
d. fcs
    14: if the destination did not receive a segment, how will the tcp host know to resend the information?
a. the ack received will not include the segment number that was not received.
b. the ack received will include the segment number that was not received.
c. the sending host will send a pack to verify segment receipt.
d. the destination host will send a yack message back to the sending host.
　　15: you are planning on using a single network that supports 208 users. which ip address class would you choose to be the most efficient?
a. class a
b. class b
c. class c
d. class d
e. class e
　　16: rfc 1918 defines the private ip address ranges. which of the following ip addresses are considered part of these ranges? (choose three.)
a. 10.23.45.67
b. 126.21.34.56
c. 172.16.32.1
d. 172.31.234.55
e. 192.169.4.5  
　　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?
department,number of users:corporate7,customer,support15,financial13,hr7,engineering16.
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
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  
    21: your organization is using the 192.168.1.0/24 address space. you need 28 subnets. what subnet mask would you use to create these subnets?  
a. 255.255.255.0
b. 255.255.255.128
c. 255.255.255.192
d. 255.255.255.224
e. 255.255.255.240
f. 255.255.255.248