问题 问答题

阅读以下说明,回答问题1至问题4,将解答填入答题纸对应的解答栏内。【说明】某公司拥有一个C类地址块212.253.115.0/24,网络拓扑结构如图1-1所示。

在PC1的DOS命令窗口中,运行arp-a命令显示PC1的ARP缓存,得到结果如图1-2所示。

采用抓包工具在PC1中捕获的、由PC1以太网接口发出的某数据包的部分信息如图1-3所示。

【问题1】

请填写图1-3中PC1的相应参数。

IP地址:(1);子网掩码:(2);默认网关:(3);以太网接口的MAC地址:(4)。

【问题2】

请填写图1-1中路由器eth0网卡的相应参数。

IP地址:(5);MAC地址:(6)。

【问题3】

在图1-2中若要删除某条ARP记录,可以采用(7)命令。

(7)备选答案:

A.arp-s

B.arp-d

C.arp-c

D.arp-a

【问题4】

图1-3表明,在默认情况下该数据包请求的服务为(8)。

答案

参考答案:

【问题1】(1)212.253.115.31(2)255.255.255.0(3)212.253.115.254(4)10:0e:3c:95:64:e5

【问题2】(5)212.253.115.254(6)0d:4f:35:23:5d:8a

【问题3】(7)B

【问题4】(8)Web或浏览页面或HTTP

解析:

本题考查子网划分和Internet协议属性设置。

【问题1】由PC1发出的数据包中源IP地址即PC1的IP地址,从图1-3可知PC1的IP地址为212.253.115.31、MAC地址为10:0e:3c:95:64:e5;再由公司拥有的C类地址块为212.253.115.0/24,且图1-2中包含了和PC1在一个网段的IP地址从212.253.115.7到212.253.115.254,故PC1的子网掩码为255.255.255.0;图1-3表明网关的MAC地址为0d:4f:35:23:5d:8a,再依据图1-2知网关对应的IP地址为212.253.115.254。

【问题2】图1-2和图1-3表明网关的MAC地址为Od:4f35:23:5d:8a、IP地址为212.253.115.254。

【问题3】删除某条ARP记录采用的命令为arp-d。

【问题4】图1-3显示PC1请求的服务端口为80,在默认情况下,数据包请求的该服务为浏览页面。

问答题
阅读理解

Beach volleyball is one of those sports that can be an exciting game to play and watch, or, can just be about some friends getting together to have a great time. It’s really easy, and all you need is sand, a net and a group of people, of any age or fitness level, who want to have fun.

Beach volleyball can be played with as few as two people on each team, making a total of four people. However, if you are less skilled and experienced in the game, it will be easier to play with a larger team. The more players you have, the less ground each person will be responsible(负责)for covering and the more time they will have to recover in between shots. If you only have a few players, each of you will get quite a workout running for the ball after each volley. If you are looking for that relaxing, fun, low-key experience, choose larger teams.

Beach volleyball is similar(相似)to regular volleyball in its rules. However, even experienced volleyball players do not realize how much more difficult it is to run and jump on sand. Since it is harder to move quickly on sand than a hard ground, play will be much slower than regular volleyball on a playground. When a player trains for beach volleyball, he will focus(专注)on building lower body strength as well as upper body. While he needs to be able to hit the ball with a great deal of power and accuracy(准确性), strengthening his legs is extremely important.

Whether you are in it for the competition, or just to have a great time with your friends, beach volleyball can be very exciting and fun. You may even start out with friends and fall in love with the sport.

小题1:When you join a large beach volleyball team, you’ll_________.

A.have as many shots as possible

B.improve your volleyball skills

C.be responsible for more ground

D.feel light-hearted(轻松)while playing小题2:Which of the following is TRUE according to the passage?

A.You can hit the ball with much less power when playing beach volleyball.

B.The playground size of beach volleyball is much larger than that of regular volleyball.

C.You can run more quickly when you are playing regular volleyball.

D.The rules of beach volleyball are totally different from those of regular volleyball.小题3:What does the writer think of beach volleyball?

A.It is a difficult sport to learn.

B.It is a very exciting and interesting sport.

C.It is a sport which needs less power.

D.It is a sport which needs more skills.小题4:Why is it much slower to play beach volley ball than regular volleyball?  Because _________.

A.it is not an easy job to move on sand

B.it is a workout running for the ball

C.it is usually a larger team

D.the beach volleyball is heavier小题5:The passage mainly tells us _________.

A.the game of beach volleyball

B.how to become an excellent volleyball player

C.why beach volleyball is one of exciting sports

D.what we should pay attention to when playing beach volleyball