多选题Which three statements correctly describe the functions and use of constraints? （）AConstraints provide data independence.BConstraints make complex queries easy.CConstraints enforce rules at the view level.DConstraints enforce rules at the table level.E

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多选题

Which three statements correctly describe the functions and use of constraints? （）

Constraints provide data independence.

Constraints make complex queries easy.

Constraints enforce rules at the view level.

Constraints enforce rules at the table level.

Constraints prevent the deletion of a table if there are dependencies.

Constraints prevent the deletion of an index if there are dependencies.

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相似问题和答案

第1题：

Which three statements correctly describe the Cisco Validated Designs program? ()(Choose three.)

A. includes three design levels

B. incorporates products and technologies into enterprise, service provider, and commercial systems

C. extends the value of designs through a sustained development plan

D. does not factor customer input design process

E. facilitates faster and more reliable customer deployments

F. incorporates a narrow range of technologies and products

参考答案：B, C, E

第2题：

Refer to the exhibit. Which three statements correctly describe Network Device A?()

A.With a network wide mask of 255.255.255.128, each interface does not require an IP address.

B.With a network wide mask of 255.255.255.128, each interface does require an IP address on a unique IP subnet.

C.With a network wide mask of 255.255.255.0, must be a Layer 2 device for the PCs to communicate with each other.

D.With a network wide mask of 255.255.255.0, must be a Layer 3 device for the PCs to communicate with each other.

E.With a network wide mask of 255.255.254.0, each interface does not require an IP address.

参考答案：B, D

第3题：

Which of the following correctly describe the various functions and virtues of a router? (Select all valid answer choices)

A. Packet switching

B. Collision prevention on a LAN segment.

C. Packet filtering

D. Broadcast domain enlargement

E. Broadcast forwarding

F. Internetwork communication

G. None of the above

正确答案：ACF
A,C,F 解析：Explanation:
The main function of a router is to connect different, separated networks together. In doing so, switching packets from one network to another is a primary function, along with providing for communication between networks. As an additional feature, routers are capable of providing filtering on a network address and application port level, so choice C is also correct.

Incorrect Answers:
B. Routers can indeed be used to segment a network separate a collision domain, since routers do not forward LAN broadcasts and multicasts to other interfaces. However, routers alone can not prevent all collisions from occurring on any given LAN segment.

D. Routers actually segment LANs into smaller broadcast domains.

E. Routers do not forward broadcast and multicast traffic out the additional interfaces by default. Unless bridging or IP helpers are configured on the router, LAN broadcasts are blocked at the router level.

第4题：

Which three statements correctly describe the Cisco Validated Designs program? （）(Choose three.)

A、includes three design levels
B、incorporates products and technologies into enterprise, service provider, and commercial systems
C、extends the value of designs through a sustained development plan
D、does not factor customer input design process
E、facilitates faster and more reliable customer deployments
F、incorporates a narrow range of technologies and products

正确答案:B,C,E

第5题：

Which three statements correctly describe the features of the I/O calibration process?（）

A、Only one I/O calibration process can run at a time.
B、It automates the resource allocation for the Automated Maintenance Tasks.
C、It improves the performance of the performance-critical sessions while running.
D、It can be used to estimate the maximum number of I/Os and maximum latency time for the system.
E、The latency time is computed only when the TIMED_STATISTICS initialization parameter is set to TRUE.

正确答案:A,D,E

第6题：

Which two statements correctly describe a situation in which an Active／Standby Service Module design is being used?()

A. Troubleshooting is more complicated.

B. Service and switch modules are underutilized.

C. Layer 2 adjacency is required with the servers that use this design.

D. Layer 3 adjacency is required with the servers that use this design.

E. Load balancing will always occur across both access layer uplinks.

参考答案：B, C

第7题：

Which two statements correctly describe VTP？（）

A、Transparent mode always has a configuration revision number of 0.
B、Transparent mode cannot modify a VLAN database.
C、Client mode cannot forward received VTP advertisements.
D、Client mode synchronizes its VLAN database from VTP advertisements.
E、Server mode can synchronize across VTP domains.

正确答案:A,D

第8题：

An ATM PVC is configured as atm pvc 1 0 101 aal5snap 256 128 100 .Which three statements describe the traffic management characteristics of this interface?()

A.A

B.B

C.C

D.D

E.E

参考答案：B, D, E

第9题：

Which of the following correctly describe the various functions and virtues of a router?（）

A、Packet switching
B、Collision prevention on a LAN segment.
C、Packet filtering
D、Broadcast domain enlargement
E、Broadcast forwarding
F、Internetwork communication

正确答案:A,C,F

第10题：

Which two statements correctly describe a situation in which an Active/Standby Service Module design is being used?（）

A、Troubleshooting is more complicated.
B、Service and switch modules are underutilized.
C、Layer 2 adjacency is required with the servers that use this design.
D、Layer 3 adjacency is required with the servers that use this design.
E、Load balancing will always occur across both access layer uplinks.

正确答案:B,C

Which three statements correctly describe the functions and

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