题目内容
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How many usable IP addresses can you get from a conventional Class C address？
A．128
B．192
C．254
D．256
E．510
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更多“How many usable IP addresses can you get from a conventional Class C address？A．128B．192C．2”相关的问题
A．1 network with 254 hosts
B．4 networks with 128 hosts
C．2 networks with 24 hosts
D．6 networks with 64 hosts
E．8 networks with 36 hosts
A. 2 networks with 62 hosts
B. 6 networks with 30 hosts
C. 16 networks and 16 hosts
D. 62 networks and 2 hosts
E. 14 networks and 14 hosts
F. None of the above
How many bits IP address are there in IPv6？ ()
A．32
B．64
C．128
D．256
A．255.255.0.0
B．255.255.224.0
C．255.255.254.0
D．255.255.255.0
E．255.255.255.224
A. IP address: 192.168.20.14 Subnet Mask: 255.255.255.248 Default Gateway:192.168.20.9
B. IP address: 192.168.20.254 Subnet Mask: 255.255.255.0 Default Gateway:192.168.20.1
C. IP address: 192.168.20.30 Subnet Mask 255.255.255.248 Default Gateway:192.168.20.25
D. IP address: 192.168.20.30 Subnet Mask 255.255.255.240 Default Gateway:192.168.20.17
E. IP address: 192.168.20.30 Subnet Mask 255.255.255.240 Default Gateway:192.168.20.25
A．IP address: 192.168.20.14 Subnet Mask: 255.255.255.248 Default Gateway: 192.168.20.9
B．IP address: 192.168.20.254 Subnet Mask: 255.255.255.0 Default Gateway: 192.168.20.1
C．IP address: 192.168.20.30 Subnet Mask 255.255.255.248 Default Gateway: 192.168.20.25
D．IP address: 192.168.20.30 Subnet Mask 255.255.255.240 Default Gateway: 192.168.20.17
E．IP address: 192.168.20.30 Subnet Mask 255.255.255.240 Default Gateway: 192.168.20.25
In any city at any time, some of the stock of usable office space is vacant. This vacant office space is unemployed capital. How would you explain this phenomenon？ Is it a social problem？
A.In many foods, the natural combination of vitamins with other nutrients makes those vitamins more usable by the body than are vitamins added in vitamin supplements.
B.People who regularly eat cereals fortified with vitamin supplements sometimes neglect to eat the foods in which the vitamins occur naturally.
C.Foods often must be fortified with vitamin supplements because naturally occurring vitamins are removed during processing.
D.Unprocessed cereals are naturally high in several of the vitamins that are usually added to fortified breakfast cereals.
E.Cereals containing vitamin supplements are no harder to digest than similar cereals without added vitamins.
Each day every person in the United States throws away more than five pounds of garbage(垃圾). There is more garbage now than ever before and most of it is made up of the packages and cans in which we put our food. The traditional way of getting rid of solid wastes is quickly becoming inadequate. Many cities are experimenting with newer ways of handling their growing piles of garbage.
One of these new ways is "recycling"(回收使用). Through recycling usable materials are taken out of garbage and made into something else. These usable parts of garbage are put through the cycle of going from a raw material to a finished product again.
In some cities a machine called Hydrapulper is being used to help recycle garbage. A Hydrapulper is like a huge mixing machine. The garbage is dropped onto a conveyor belt (传送带) that feeds the machine. At the same time, water is pumped into the Hydrapulper. With a mixing action, the Hydrapulper throws out the heavy metal objects that can later be sold as waste metal. The rest of the garbage—paper, food, plastic, rubber, glass, wood, leaves, and other items—falls apart. The waste is then mixed with water and carried to another piece of equipment where glass, sand and small pieces of metal are thrown out.
With the Hydrapulper, up to 95 percent of the original garbage is made again useful. The rest turns into furnace ash(炉灰).
Traditionally, garbage is thought to be ______.
A．a worthless burden to big cities
B．something that can be reused
C．a raw material for making new products
D．able to be recycled but difficult to handle
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