單項(xiàng)選擇題What is the first 24 bits in a MAC address called?（）

A. NIC
B. BIA
C. OUI
D. VAI


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1.單項(xiàng)選擇題When is it necessary to use a public IP address on a routing interface?（）

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.

2.單項(xiàng)選擇題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.

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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.

7.單項(xiàng)選擇題Which option is a valid IPv6 address?（）

A. 2001:0000:130F::099a::12a
B. 2002:7654:A1AD:61:81AF:CCC1
C. FEC0:ABCD:WXYZ:0067::2A4
D. 2004:1:25A4:886F::1

8.單項(xiàng)選擇題What is known as "one-to-nearest" addressing in IPv6?（）

A. global unicast
B. anycast
C. multicast
D. unspecified address

9.單項(xiàng)選擇題Which type of cable is used to connect the COM port of a host to the COM port of a router or switch?（）

A. crossover
B. straight-through
C. rolled
D. shielded twisted-pair

10.單項(xiàng)選擇題Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?（）

A. BackboneFast
B. UplinkFast
C. Root Guard
D. BPDU Guard
E. BPDU Filter