Which two statements are true about constraints? （）A、The UNIQUE constraint does not permit a null value for the column.B、A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints.C、The PRIMARY KEY and FOREIGN KEY constraints create a

题目

Which two statements are true about constraints? （）

  • A、The UNIQUE constraint does not permit a null value for the column.
  • B、A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints.
  • C、The PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index.
  • D、The NOT NULL constraint ensures that null values are not permitted for the column.
相似考题

1.Which two statements are true about pool－based source NAT? ()(Choose two.)A. PAT is not supported.B. PAT is enabled by default.C. It supports the address-persistent configuration option.D. It supports the junos-global configuration option.

2.Referring to the exhibit, which two statements are true?()A. The route 192.168.1.0/25 is acceptedB. The route 192.168.2.0/24 is acceptedC. OSPF routes will be exported into RIPD. RIP routes will be exported into OSPF

3.Which two statements are true with regard to policy ordering? ()(Choose two.)A. The last policy is the default policy, which allows all traffic.B. The order of policies is not important.C. New policies are placed at the end of the policy list.D. The insert command can be used to change the order.

4.Which two statements are true about AH?() (Choose two.)A. AH provides data integrity.B. AH is identified by IP protocol 50.C. AH is identified by IP protocol 51.D. AH cannot work in conjunction with ESP

更多“Which two statements are true ab”相关问题

  • 第1题：

    Which two statements regarding symmetric key encryption are true?() (Choose two.)

    A. The same key is used for encryption and decryption.

    B. It is commonly used to create digital certificate signatures.

    C. It uses two keys: one for encryption and a different key for decryption.

    D. An attacker can decrypt data if the attacker captures the key used for encryption.


    参考答案：A, D

  • 第2题：

    Which two statements are true regarding L2TP? ()(Choose two.)

    A. Tunnels are initiated by the LAC

    B. Tunnels are initiated by the LNS

    C. By default, subscriber authentication occurs on the LNS

    D. By default, subscriber authentication occurs on the LAC


    参考答案：A, C

  • 第3题：

    Which two statements are true about traffic shaping？（）

    • A、Out-of-profile packets are queued.
    • B、It causes TCP retransmits.
    • C、Marking/remarking is not supported.
    • D、It does not respond to BECN and ForeSight Messages.
    • E、It uses a single/two-bucket mechanism for metering.

    正确答案:A,C

  • 第4题：

    In Cisco Nexus 1000V deployments which two statements are true?（）

    • A、Vmware provides the VNIC and drivers
    • B、Vmware provides the VNIC and Cisco provides the drivers
    • C、Cisco provides the switching and management of switching
    • D、Cisco provides the switching and Vmware provides the management of switching

    正确答案:A,C

  • 第5题：

    Which two statements are true regarding high-availability chassis clustering？（）

    • A、A chassis cluster consists of two devices.
    • B、A chassis cluster consists of two or more devices.
    • C、Devices participating in a chassis cluster can be different models.
    • D、Devices participating in a chassis cluster must be the same models

    正确答案:A,D

  • 第6题：

    Which two statements are true about pool-based source NAT? （）(Choose two.)

    • A、PAT is not supported.
    • B、PAT is enabled by default.
    • C、It supports the address-persistent configuration option.
    • D、It supports the junos-global configuration option.

    正确答案:B,C

  • 第7题：

    Which two statements are true about standard database auditing（）

    • A、DDL statements can be audited.
    • B、Statements that refer to stand-alone procedure can be audited.
    • C、Operations by the users logged on as SYSDBA cannot be audited.
    • D、Only one audit record is ever created for a session per audited statement even though it is executedmore than once.

    正确答案:A,B

  • 第8题：

    多选题
    Which two statements are true with regard to policy ordering? （）(Choose two.)
    A

    The last policy is the default policy, which allows all traffic.

    B

    The order of policies is not important.

    C

    New policies are placed at the end of the policy list.

    D

    The insert command can be used to change the order.


    正确答案： B,D
    解析： 暂无解析

  • 第9题：

    多选题
    Which two statements are true regarding the USING and ON clauses in table joins?（）
    A

    Both USING and ON clauses can be used for equijoins and nonequijoins

    B

    Amaximum of one pair of columns can be joined between two tables using the ON clause

    C

    The ON clause can be used to join tables on columns that have different names but compatible data types

    D

    The WHERE clause can be used to apply additional conditions in SELECT statements containing the ON or the USING clause


    正确答案： A,D
    解析： 暂无解析

  • 第10题：

    多选题
    Which two statements are true regarding L2TP? （）(Choose two.)
    A

    Tunnels are initiated by the LAC

    B

    Tunnels are initiated by the LNS

    C

    By default, subscriber authentication occurs on the LNS

    D

    By default, subscriber authentication occurs on the LAC


    正确答案： C,D
    解析： 暂无解析

  • 第11题：

    多选题
    Given that b and c refer to instances of wrapper classes， which two statements are true？（）
    A

    b.equals（b） returns true.

    B

    b.equals（c） returns the same result as b == c.

    C

    b.eqials（c） can return false even if c.equals（b） returns true.

    D

    b.equals（c） throws an exception if b and c are different wrapper types.

    E

    b.equals（c） returns false if the type of wrapper objects being compared are different.


    正确答案： C,E
    解析： 暂无解析

  • 第12题：

    多选题
    Which two statements are true about traffic shaping？（）
    A

    Out-of-profile packets are queued.

    B

    It causes TCP retransmits.

    C

    Marking/remarking is not supported.

    D

    It does not respond to BECN and ForeSight Messages.

    E

    It uses a single/two-bucket mechanism for metering.


    正确答案： E,B
    解析： 暂无解析

  • 第13题：

    Which two statements are true about precedence values in policy?() (Choose two.)

    A. 1 is the default precedence.

    B. A lower number is preferred.

    C. A higher number is preferred.

    D. 100 is the default precedence.


    参考答案：B, D

  • 第14题：

    Which two statements are true about L2TP tunnels?（） (Choose two.)

    • A、Traffic is clear text
    • B、Traffic is encrypted 
    • C、They are initiated by the LNS
    • D、They are initiated by the LAC

    正确答案:A,D

  • 第15题：

    Which two statements about the Cisco Nexus 1000V VSM are true?（）

    • A、It performs switching decisions and forwarding for the VEM
    • B、It can be run on a virtual machine
    • C、It can be used for remote VEM switching Iine cards

    正确答案:B,C

  • 第16题：

    Which of the following statements are true？（） 

    • A、 The equals（） method determines if reference values refer to the same object.
    • B、 The == operator determines if the contents and type of two separate objects match.
    • C、 The equals（） method returns true only when the contents of two objects match.
    • D、 The class File overrides equals（） to return true if the contents and type of two separate objects        match.

    正确答案:A,D

  • 第17题：

    Which two statements are true regarding L2TP? （）(Choose two.)

    • A、Tunnels are initiated by the LAC
    • B、Tunnels are initiated by the LNS
    • C、By default, subscriber authentication occurs on the LNS
    • D、By default, subscriber authentication occurs on the LAC

    正确答案:A,C

  • 第18题：

    Which two statements are true regarding subqueries? （）

    • A、A subquery can retrieve zero or more rows 
    • B、Only two subqueries can be placed atone level 
    • C、A subquery can be used only in SQL query statements 
    • D、A subquery can appear on either side of a comparison operator 
    • E、There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement 

    正确答案:A,D

  • 第19题：

    Which two statements are true about record groups?（）

    • A、They are stored in the database. 
    • B、They are stored in local Forms memory. 
    • C、The type is specified explicitly at design time. 
    • D、The type is implied by when and how it is created.

    正确答案:B,D

  • 第20题：

    多选题
    Which two statements are true about L2TP tunnels?（） (Choose two.)
    A

    Traffic is clear text

    B

    Traffic is encrypted 

    C

    They are initiated by the LNS

    D

    They are initiated by the LAC


    正确答案： B,D
    解析： 暂无解析

  • 第21题：

    多选题
    Which two statements are true about AH?（） (Choose two.)
    A

    AH provides data integrity.

    B

    AH is identified by IP protocol 50.

    C

    AH is identified by IP protocol 51.

    D

    AH cannot work in conjunction with ESP


    正确答案： D,C
    解析： 暂无解析

  • 第22题：

    多选题
    Which two statements about SCSI are true？ （）
    A

    The bus is limited to 32 devices

    B

    It is a full duplex serial standard

    C

    It is a half-duplex serial standard

    D

    It allows up to 320 MB/s of shared channel bandwidth


    正确答案： B,C
    解析： 暂无解析

  • 第23题：

    多选题
    Which of the following statements are true？（）
    A

    The equals（） method determines if reference values refer to the same object.

    B

    The == operator determines if the contents and type of two separate objects match.

    C

    The equals（） method returns true only when the contents of two objects match.

    D

    The class File overrides equals（） to return true if the contents and type of two separate objects        match.


    正确答案： C,D
    解析： 严格来说这个问题的答案是不确定的，因为equals()方法是可以被重载的，但是按照java语言的本意来说：如果没有重写（override）新类的equals()，则该方法和 == 操作符一样在两个变量指向同一对象时返回真，但是java推荐的是使用equals()方法来判断两个对象的内容是否一样，就像String类的equals()方法所做的那样：判定两个String对象的内容是否相同，而==操作符返回true的唯一条件是两个变量指向同一对象。从这个意义上来说选择给定的答案。从更严格的意义来说正确答案应该只有D。

  • 第24题：

    多选题
    Which two statements are true regarding high-availability chassis clustering？（）
    A

    A chassis cluster consists of two devices.

    B

    A chassis cluster consists of two or more devices.

    C

    Devices participating in a chassis cluster can be different models.

    D

    Devices participating in a chassis cluster must be the same models


    正确答案： C,B
    解析： 暂无解析

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