The internet address 198.102.27.120 represents which of the following addresses？（）A、Class AB、Class BC、Class CD、Class D

When you think of the Internet, you probably think of ".com." Just what do those three letters at the end of a World Wide Web address mean? Every computer that hosts data on the Internet has a(71)numerical address. For example, the numerical address for the White House is 198.137.240.100. But since(72)people want to remember long strings of numbers, the(73)was developed. It is a critical part of the Internet's technical infrastructure, correlates a numerical address to a word. To(74)the White House website, you could type its numerical address into the address box of your web browser. But most people prefer to use "www. whitehouse. gov." In this case, the domain name is(75).

A．unique

B．isolated

C．similar

D．same

Interface ge-0/0/2.0 of your device is attached to the Internet and is configured with an IP address and network mask of 71.33.252.17/24. A Web server with IP address 10.20.20.1 is running an HTTP service on TCP port 8080. The Web server is attached to the ge-0/0/0.0 interface of your device. You must use NAT to make the Web server reachable from the Internet using port translation.Which type of NAT must you configure?（）

A. source NAT with address shifting

B. pool-based source NAT

C. static destination NAT

D. pool-based destination NAT

The number of home users and small businesses that want to use the Internet is ever increasing. The shortage of addresses is becoming a serious problem.A quick solution to this problem is called network address translation(NAT).NAT enables a user to have a large set of addresses（ ）and one address, or a smallset of addresses,externally. The traffic inside can use the large set; the traffic（ ）, the small set. To separate the addresses used inside the home or business and the ones used for the Internet, the Internet authorities have reserved three sets of addresses as（ ）addresses. Any organization can use an address out of this set without permission from the Internet authorities. Everyone knows that these reserved addresses are for private networks.They are（ ）inside the organization, but they are not unique globally. No router will（ ）a packet that has one of these addresses as the destination address.The site must have only one single connection to the global Internet through a router that runs the NAT software.A.absolutely

B.completely

C.internally

D.externally

A.local

B.outside

C.middle

D.around

A.private

B.common

C.public

D.external

A.unique

B.observable

C.particular

D.ordinary

A.reject

B.receive

C.deny

D.forward

请帮忙给出每个问题的正确答案和分析，谢谢！

A router that performs Network Address Translation (NAT) is installed between your computer and the Internet.The router fails. You connect the computer directly to the Internet.You need to ensure that the computer is connected to the Internet in the most secure manner possible.What should you do?（）

A.A

B.B

C.C

D.D

Each machine in the internet is assigned a unique network address,called（）,that is used to identify the machine for communication purposes

A.MAC address

B.IP address

C.host address

D.domain name address

A. Network Address Translation

B. Port forwarding

C. Quality of Service

D. SSID broadcast

Which of the following statements about internet is (are) correct?

Ⅰ.Each host in internet only has a IP address.

Ⅱ.It is possible to have multiple names corresponding to the same IP address.

Ⅲ.In users' points, Internet means a virtual network.

A．None

B．Ⅰ and Ⅱ

C．Ⅱ and Ⅲ

D．All

A. Connect a router on a local network.

B. Connect a router to another router.

C. Allow distribution of routes between networks.

D. Translate a private IP address.

E. Connect a network to the Internet.