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Which two statements are true of a network mask?（）

题目
多选题
Which two statements are true of a network mask?（）
A

A subnet mask specifies the portion of an IP address that is in a binary format.

B

A subnet mask specifies the portion of an IP address that is in a decimal format.

C

A subnet mask specifies the portion of an IP address that represents a network prefix.

D

A subnet mask specifies the portion of an IP address that represents network hosts.

参考答案和解析
正确答案： C,D
解析： 暂无解析
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相似问题和答案

第1题：

Which two statements about the use of VLANs to segment a network are true?()

A. VLANs increase the size of collision domains.

B. VLANs allow logical grouping of users by function.

C. VLANs simplify switch administration.

D. VLANs enhance network security.


参考答案：B, D

第2题：

Which two statements about NTP version 4 are true？（）

  • A、It supports fast synchronization at starting and before network failures
  • B、It supports automatic server discovery
  • C、It uses a fixed-point arithmetion
  • D、It supports the "nanokernel" kernel implementation
  • E、It does not support Public-Key Cryptography

正确答案:B,D

第3题：

You have a class B network with a 255.255.255.0 mask. Which of the statements below are true of this network? (Select all valid answers)

A. There are 254 usable subnets.

B. There are 256 usable hosts per subnet.

C. There are 50 usable subnets.

D. There are 254 usable hosts per subnet.

E. There are 24 usable hosts per subnet.

F. There is one usable network.


正确答案：AD
A,D 解析：Explanation:
The default subnet mask for Class B is 255.255.0.0. Thus an extra 8 bits have been used for the network portion, leaving 8 for hosts. The 2n - 2 formula (28 - 2 in this case for both the network and IP hosts) gives us 254 networks and 254 hosts per network.

Incorrect Answers:
B: We must remember to always subtract 2 (one for the network, and one for the broadcast) so the result is 254, not 256.

C, E: No possible network mask would give us this exact number of subnets or hosts.

F: This would be true if this were a class C network, not a class B.

第4题：

Which two statements are true about optical networks?（）

  • A、SONET and SDH both use time-division multiplexing.
  • B、An optical transport network system uses time-division multiplexing.
  • C、SONET and SDH both use wavelength-division multiplexing.
  • D、An optical transport network system uses wavelength-division multiplexing.

正确答案:A,D

第5题：

Which two statements are true about the command ip route 172.16.3.0 255.255.255.0 192.168.2.4? (Choose two.)（）

  • A、It establishes a static route to the 172.16.3.0 network.
  • B、It establishes a static route to the 192.168.2.0 network.
  • C、It configures the router to send any traffic for an unknown destination to the 172.16.3.0 network.
  • D、It configures the router to send any traffic for an unknown destination out the interface with the address 192.168.2.4.
  • E、It uses the default administrative distance.
  • F、It is a route that would be used last if other routes to the same destination exist.

正确答案:A,E

第6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7题：

Which two statements about an IDS are true？（）

  • A、The IDS is in the traffic path.
  • B、The IDS can send TCP resets to the source device.
  • C、The IDS can send TCP resets to the destination device.
  • D、The IDS listens promiscuously to all traffic on the network.
  • E、Default operation is for the IDS to discard malicious traffic.

正确答案:B,D

第8题：

The following configuration command was entered into a router:ip route 172.16.3.0 255.255.255.0 192.168.2.4 Which of the following statements are true regarding this configuration change?()

A. The default administrative distance is used.

B. The command is used to establish a static route.

C. The command is used to configure the router interfaces.

D. The command is used to establish a stub network.

E. The subnet mask for the source address is 255.255.255.0


参考答案：A, B

第9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10题：

Which two statements are true about the application of QoS in a converged network？（）

  • A、end-to-end network delay times that exceed 50 ms for real-time traffic are considered unacceptable
  • B、end-to-end network delay times that exceed 250 ms for real-time traffic are considered unacceptable
  • C、end-to-end network delay is not a factor as long as the  delay is consistent
  • D、some packet loss can be corrected by codec algorithms
  • E、RSVP handles voice packet retransmission
  • F、fragmentation is a result of packet loss

正确答案:B,D

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