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【单选题】
可以使用下面语句删除表中列A.
ALTER 表名 DROP 列名
B.
ALTER 表名 DELETE 列名
C.
ALTER 表名 REMOVE 列名
D.
ALTER 表名 DROP COLUMN 列名
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举一反三
【单选题】Refer to the exhibit. A packet with a source IP address of 192.168.2.4 and a destination IP address of 10.1.1.4 arrives at the HokesB router. What action does the router take？（）
A.
forwards the received packet out the Serial0/0 interface
B.
forwards a packet containing an EIGRP advertisement out the Serial0/1 interface
C.
forwards a packet containing an ICMP message out the FastEthernet0/0 interface
D.
forwards a packet containing an ARP request out the FastEthernet0/1 interface
【单选题】What 8-bit field exists in IP packet for QoS?
A.
数据包中用于表示QoS的8比特字段是什么？
B.
Tos Field（Tos 字段）
C.
DSCP
D.
IP Precedence（IP优先级）
E.
Cos
【简答题】简述女性月经期间应该注意的事项。
【单选题】In which byte of an IP packet can traffic be marked ?
A.
the QoS byte
B.
the CoS byte
C.
the ToS byte
D.
the DSCP byte
【简答题】What field in IP packet is used for classification by QOS？
【简答题】阅读下面的短文，回答问题 [When an IP packet arrives at a router, generally the router looks at the destination address of the packet, and forwards the packet to one of its network inteces. The forwarding decis...
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