Cisco试题库:ccna真题(下)(8)

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36: one of your co-workers at acme, inc., needs to convert the binary number 11010110 into a decimal. what is the decimal equivalent?　　a. 198

　　b. 214

　　c. 252

　　d. 255　　　　37: one of your co-workers at acme, inc., needs to convert the binary number 10110110 into a decimal. what is the decimal equivalent?

　　a. 182

　　b. 192

　　c. 202

　　d. 212　　　　38: you are configuring a subnet for the acme, inc., branch office in beijing. you need to assign ip addresses to hosts in this subnet. you have been given the subnet mask of 255.255.255.224. which of these ip addresses would be valid? (choose three.)

　　a. 15.234.118.63

　　b. 92.11.178.93

　　c. 134.178.18.56

　　d. 192.168.16.87

　　e. 201.45.116.159

　　f. 217.63.12.192　　　　39: you are a network technician at acme, inc. you have subnetted the 208.98.112.0 network with a /28 mask. your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. what should you tell her, assuming your router is using ip subnet-zero?

　　a. 62 networks and 2 hosts

　　b. 6 networks and 30 hosts

　　c. 8 networks and 32 hosts

　　d. 16 networks and 16 hosts

　　e. 16 networks and 14 hosts

　　40: what is a disadvantage of using a connection-oriented protocol such as tcp? 　　a. packet acknowledgment might add overhead.

　　b. packets are not tagged with sequence numbers.

　　c. loss or duplication of data packets is more likely to occur.

　　d. the application layer must assume responsibility for the correct sequencing of the data packets.