When is it necessary to use a public IP address on a routing interface?（）

单项选择题What will happen if a private IP address is assigned to a public interface connected to an ISP?（）

A. Addresses in a private range will be not routed on the Internet backbone.
B. Only the ISP router will have the capability to access the public network.
C. The NAT process will be used to translate this address in a valid IP address.
D. Several automated methods will be necessary on the private network.
E. A conflict of IP addresses happens, because other public routers can use the same range.

单项选择题Which IP address can be assigned to an Internet interface?（）

A. 10.180.48.224
B. 9.255.255.10
C. 192.168.20.223
D. 172.16.200.18

单项选择题What is the principle reason to use a private IP address on an internal network?（）

A. Subnet strategy for private companies.
B. Manage and scale the growth of the internal network.
C. Conserve public IP addresses so that we do not run out of them.
D. Allow access reserved to the devices.

单项选择题Which layer of the OSI reference model uses flow control, sequencing, and acknowledgements to ensure that reliable networking occurs?（）

A. data link
B. network
C. transport
D. presentation
E. physical

单项选择题Which layer of the OSI reference model uses the hardware address of a device to ensure message delivery to the proper host on a LAN?（）

A. physical
B. data link
C. network
D. transport