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计算机网络习题8计算机网络习题8
问题 1 得 0 分,满分 10 分 You have a single Class C IP address and a point-to-point serial link that you want to im-plement VLSM on. Which subnet mask is the most efficient? 所选答案:
B. 255.255.255.240
正确答案:
D. 255.255.255.252
反馈:
For a single point to point link, only 2 IP addresses are required, one for the serial interface of the router at each end. Therefore, the 255.255.255.252 subnet mask is often used for these types of links, as no IP addresses are wasted.
问题 2 得 0 分,满分 10 分 What is the network address for a host with the IP address 201.100.5.68/28? 所选答案:
B. 201.100.5.32
正确答案:
C. 201.100.5.64
反馈:
This is a C ip with a subnet mask of 255.255.255.240 the host 201.100.5.68/28 belong to the sec-ond subnet which is 201.100.5.64 this is determined by doing the following: subnets?2^4-2=14 hosts?2^4-2=14 valid subnet range?256-240=16 16+16=32,16+32=4
问题 3 得 10 分,满分 10 分 Study the Exhibit carefully. What switch functionality will prevent Layer 2 broadcasts from mov-ing between the networks shown? 193.GIF 所选答案:
A. VLAN
正确答案:
A. VLAN
问题 4 得 10 分,满分 10 分 How do you express the binary numberin decimal form? 所选答案:
C. 179
正确答案:
C. 179
问题 5 得 0 分,满分 10 分 Given the choices below, which address represents a unicast address? 所选答案:
C. 192.168.24.59/30
正确答案:
D. 172.31.128.255/18
反馈:
172.31.128.255 is the only unicast address. It seems to be a broadcast address, because of 255 in the last octet. However, the broadcast address for this network is actually 172.31.131.255.
问题 6 得 0 分,满分 10 分 How would you express the binary number:in its decimal and hexadecimal forms? 所选答案:
C. Decimal=180, hexadecimal=BB
正确答案:
B. Decimal=170, hexadecimal=AA
反馈:
For the binary equivalent ofto Decimal, the answer is 128+32+8+2=170. For the hexa-decimal number, we need to break up the binary number into two bytes of 1010 and 1010. Each one in binar
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