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【单选题】
Refer to the exhibit. What can be determined about routes that are learned from the router at IP address 190.171.23.12?A.
HQ_Router last received an update from 190.171.23.12 at 3:30 am.
B.
If HQ_Router does not receive an update from 190.171.23.12 in 30 seconds, all routes from that source will be removed from the routing table.
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Ctrl+Enter
B.
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D.
Alt+Ctrl+B
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A.
）数据库二级模式结构由内模式、模式和外模式组成
B.
） DBMS 在数据库三级模式之间提供外模式膜式映像和模式 / 内模式映像
C.
）外模式 / 模式映像实现数据的逻辑独立性
D.
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【单选题】In a stack, the process of inserting an element is called as ( )
A.
POP
B.
ENTER
C.
CREATE
D.
PUSH
【单选题】There is an algorithm with inserting an item to a ordered SeqList and still keeping the SeqList ordered. The computational efficiency of this inserting algorithm is ( ).
A.
O(log2n)
B.
O(1)
C.
O(n)
D.
O(n2)
【单选题】One can make a password safer by ______.
A.
inserting pictures between numbers
B.
avoiding the use of letters altogether
C.
setting up a firewall against computer hackers
D.
using complicated combinations of numbers and letters
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