单选题Which of the following is the subnet mask for a Class C IP address?（）A 10.0.0.1B 192.168.1.1C 255.255.0.0D 255.255.255.0

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第3题：

Which of the following is the subnet mask for a Class C IP address?（）

• A、10.0.0.1
• B、192.168.1.1
• C、255.255.0.0
• D、255.255.255.0

第4题：

You are a systems administrator and you are about to assign static IP addresses to various servers on your network. For the network 192.168.20.24/29 the router is assigned to the first usable host address, while the last usable host address goes to your Sales server. Which one of the following commands would you enter into the IP properties box of the sales server?（）

• A、IP address: 192.168.20.14 Subnet Mask: 255.255.255.248 Default Gateway:192.168.20.9
• B、IP address: 192.168.20.254 Subnet Mask: 255.255.255.0 Default Gateway:192.168.20.1
• C、IP address: 192.168.20.30 Subnet Mask 255.255.255.248 Default Gateway:192.168.20.25
• D、IP address: 192.168.20.30 Subnet Mask 255.255.255.240 Default Gateway:192.168.20.17
• E、IP address: 192.168.20.30 Subnet Mask 255.255.255.240 Default Gateway:192.168.20.25

第5题：

You have a single Class C IP address and a point-to-point serial link that you want to implement VLSM on. Which subnet mask is the most efficient?（）

• A、255.255.255.0
• B、255.255.255.240
• C、255.255.255.248
• D、255.255.255.252
• E、255.255.255.254

第6题：

Which of the following TCP/IP addresses is a Class C address?（）

• A、10.0.0.1
• B、12.78.1.1
• C、172.16.1.1
• D、192.168.1.1

第7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.

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第14题：

Your ISP has assigned you the following IP address and subnet mask: IP address: 199.141.27.0 Subnet mask: 255.255.255.240 Which of the following addresses can be allocated to hosts on the resulting subnet?（）

• A、199.141.27.2
• B、199.141.27.175
• C、199.141.27.13
• D、199.141.27.11
• E、199.141.27.208
• F、199.141.27.112

第15题：

A network administrator provides an IP address of 128.135.0.142 and a subnet mask of 255.0.0.0.  Once a ping is attempted， it fails.  Which of the following options is the most probable cause of the failed ping？（）

• A、0 is not valid in an IP address
• B、128 is a reserved network
• C、The subnet mask should be 255.255.0.0. since it is a class B
• D、A network problem has occurred since IP and subnet are valid

第16题：

In the implementation of VLSM techniques on a network using a single Class C IP address,which subnet mask is the most efficient for point-to-point serial links?（）

• A、255.255.255.240
• B、255.255.255.254
• C、255.255.255.252
• D、255.255.255.0
• E、255.255.255.248

第17题：

A technician needs to assign a default subnet mask for a class B network to a network device that was just installed. Which of the following would the technician use?（）

• A、224.0.0.1
• B、255.0.0.0
• C、255.255.0.0
• D、255.255.255.0

第18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 represetns network hosts

第19题：

A user is unable to reach the Internet. The technician asks the user to do an IPCONFIG /all. The userreports that their IP address is 172.16.1.18, subnet mask is 255.255.255.0, and their default gateway is 172.16.1.18. Which of the following is the cause of the problem?（）

• A、Default gateway
• B、Network cable
• C、Subnet mask
• D、CNAME record

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