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CCNA系列認證CCNA(640-802)單項選擇題每日一練(2019.10.22)

單項選擇題
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.
單項選擇題
If an Ethernet port on a router was assigned an IP address of 172.1.1.1/20,what is the maximum number of hosts allowed on this subnet?（）
A. 4094
B. 1024
C. 8190
D. 2046
E. 4096
單項選擇題
Which command helps a network administrator to manage memory by displaying flash memory and NVRAM utilization?（）
A. show secure
B. show file systems
C. show flash
D. show version
單項選擇題
What is the function of the command switchport trunk native vlan 999 on a Cisco Catalyst switch?（）
A.It creates a VLAN 999 interface.
B.It designates VLAN 999 for untagged traffic.
C.It blocks VLAN 999 traffic from passing on the trunk.
D.It designates VLAN 999 as the default for all unknown tagged traffic.
單項選擇題
In the implementation of VLSM techniques on a network using a single Class C IP address, which subnet mask is the most efficient for point-to-point serial links? （）
A.255.255.255.0
B.255.255.255.240
C.255.255.255.248
D.255.255.255.252
E.255.255.255.254