Which unique characteristics of the Data Center Aggregation layer must be considered by an Enterprise Campus designer？（）
A . Layer 3 routing between the Access and Aggregation layers facilities the ability to span VLANsacross multiple access switches， which is a requirement for many server virtualization andclustering technologies.
B . “East-west” server-to-server traffic can travel between aggregation modules by way of the core，but backup and replication traffic typically remains within an aggregation module.
C . Load balancing， firewall service， and other network service are commonly integrated by the useof service modules that are inserted in the aggregation switched.
D . Virtualization tools allow a cost effective approach for redundancy in the network design byusing two or four VDCs from the same physical switch.
相似题目
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A computer is connected to the network through a NIC， which has a unique assignment that is called the Ethernet MAC address. Which layer of the OSI model does the MAC address use to communicate with the network？（）
A . network
B . application
C . session
D . data link
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Which configuration prevents traffic that is sourced from the unique local address scope to be sent out ofthe link to the upstream service provider？（）
A . interface Ethernet0/0 I.pv6 traffic-filter NoULA out I.pv6 access-list NoULA Deny ipv6 FC00：：/8 any Permit ipv6 any any
B . interface Ethernet0/0 I.pv6 traffic-filter NoULA out I.pv6 access-list NoULA Deny ipv6 FC00：：/7 anyP ermit ipv8 any any
C . interface Ethernet0/0 I.pv6 access-group NoULA out I.pv6 access-list NoULA Deny ipv6 FC00：：/8 anyP ermit ipv6 any any
D . interface Ethernet0/0 I.pv6 access-group NoULA out I.pv6 access-list NoULA Deny ipv6 FC00：：/7 any Permit ipv6 any any
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unique sequence (单一序列)
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You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index. Which two are possible if table updates are performed which affect the invisible index columns?（）
A . The index remains invisible.
B . The index is not updated by the DML statements on the indexed table.
C . The index automatically becomes visible in order to have it updated by DML on the table.
D . The index becomes unusable but the table is updated by the DML.
E . The index is updated by the DML on the table.
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Which three characteristics are unique to the buying process for A small business compared with the buying process for an enterprise?（）
A . much faster
B . focused primarily on cost
C . not constrained by formal RFP
D . technology focused
E . less educated
F . influenced by peer
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For which two constraints does the Oracle Server implicitly create a unique index? （）
A . NOT NULL
B . PRIMARY KEY
C . FOREIGN KEY
D . CHECK
E . UNIQUE
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You need to create a column that allows you to createa unique constraint. Which two column definitions should you choose?（）
A . nvarchar（100） NULL
B . nvarchar（max） NOT NULL
C . nvarchar（100） NOT NULL
D . nvarchar（100） SPARSE NULL
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Which of the following is true of an index used to support a UNIQUE constraint?（）
A . It must have the UNIQUE attribute.
B . It cannot be created explicitly by the user.
C . It must have the UNIQUE and CLUSTER attributes.
D . It must have the UNIQUE WHERE NOT NULL attribute.
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Which two features are unique to SPA 525 phones compared to SPA 501， SPA 502， and SPA 508 phones？ （）
A . monochrome backlit display
B . full-duplex speakerphone
C . MP3 music player
D . dynamic softkeys
E . Bluetooth
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Small businesses face unique customer challenges, which three challenges are small businesses looking to overcome？（）
A . operational efficiency
B . data center deployments
C . cost containment
D . technical staffing
E . customer responsiveness
F . employee training
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Which two components are unique to controller-based wireless installations？ （）
A . Mobility Services Engine
B . WLAN controller
C . Cisco Wireless Control System
D . rugged/exterior access points
E . interior access point
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Small businesses face unique customer challenges, which three challenges are small businesseslooking to overcome?（）
A . technical staffing
B . data center deployments
C . employee training
D . cost containment
E . operational efficiency
F . customer responsivene
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Which pseudocolumn could you use to identify a unique row in a Flashback Versions Query？（）
A . XID
B . VERSIONS_PK
C . VERSIONS_XID
D . VERSIONS_UNIQUE
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Colorism is often viewed as a problem that’s unique to communities of color in which darker-skinned people discriminate against their lighter-skinned counterparts.
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Iranian follow which is uniquely used in Iran.
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The Four Great Woodblocks in China, refers to New Year pictures from _______ Yangliuqing, Suzhou Taohuawu, _______ Yangjiabu, and ______ Wuqiang are acknowledged as each of which boasts unique features.
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unique是唯一性约束。
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It unique producing methods.
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更改“成绩表”为列“column_b”设置“UNIQUE”约束。 ALTER TABLE 成绩表 ADD column_b VARCHAR(20) NULL CONSTRAINT b_unique UNIQUE
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UNIQUE约束的列不允许为空。（)
是
否
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You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index.Which two are possible if table updates are performed which affect the invisible index columns？（）
A. The index remains invisible.
B. The index is not updated by the DML statements on the indexed table.
C. The index automatically becomes visible in order to have it updated by DML on the table.
D. The index becomes unusable but the table is updated by the DML.
E. The index is updated by the DML on the table.
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Just as everyone ’ s experience of culture shock is unique, the symptoms associated with it vary, too. They can range from the physical — headaches, lethargy, sleep problems, loss of appetite and digestive irregularities — to the psychological — irritability and anger over minor frustrations, confusion about morals and values. Suffering from culture shock often leaves people feeling moody, isolated and insecure. 判断题: Which one is a psychological symptom？
A．headaches
B．sleep problems
C．loss of appetite
D．irritability
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UNIQUE关键字的作用是（)。
A．保证该列的值不重复
B．保证该列的值不能为NULL
C．保证该列的值不能删除
D．保证该列NULL值不能重复
