摘要：对于【网络工程师】软考考试而言，试题无疑是最重要的学习资料之一。在软考备考过程中，吃透试题、掌握试题所考知识点、熟悉试题的出题思路，对我们提升分数的效果是最明显的，通过对试题的反复练习，还可以查漏补缺。今天，给大家带来【2022年5月网络工程师模拟题上午（一）】部分试题的详解，一起来看看吧~



1、Since wireless is inherently a broadcast （71）, 802.11 radios also have to deal with the problem that multiple transmissions that are sent at the same time will （72）, which may interfere with reception. To handle this problem, 802.11 uses a CSMA (Carrier Sense Multiple Access) scheme that draws on ideas from classic wired Ethernet, which, ironically, drew from an early wireless network developed in Hawaii and called ALOHA. Computers wait for a （73） random interval before transmitting, and defer their transmissions if they hear that someone else is already transmitting. This scheme makes it less likely that two computers will send at the same time. It does not work as well as in the case of wired networks,though.Suppose that computer A is transmitting to computer B, but the radio range of A’s transmitter is too short to reach computer C. If C wants to transmit to B,it can （74） before starting, but the fact that it does not hear anything does not mean that its transmission will succeed. The inability of C to hear A before starting causes some collisions to occur. After any collision, the sender then waits another, longer, random delay and （75） the packet. Despite this and some other issues, the scheme works well enough in practice.
A、 fixed
B、 short
C、 long
D、 inestimable

答案:B
答题解析:

由于无线在本质上是一种广播媒体，802.11无线电还必须处理同时发送的多个传输将发生碰撞的问题，这可能会干扰接收。为了解决这个问题，802.11使用了CSMA（载波监听多路访问）方案，该方案借鉴了经典有线以太网的想法，具有讽刺意味的是，以太网来自夏威夷早期开发的一个名为aloha的早期无线网络。计算机在传输之前等待一个短的随机间隔，如果听到其他人已经在发送，就会推迟传输。这个方案降低了两台计算机同时发送信息的可能性。不过，它的效果不如有线网络那么好。假设计算机A传输计算机B，但A的发射机的无线电范围太短，不能到达计算机C.如果C想传输B，它可以在开始发送之前监听，但它没有听到任何东西并不意味着它的传输将成功。C在启动前不能听到A，这就会导致发生一些碰撞。在任何碰撞后，发送方都会等待另一个更长的随机延迟并重新传输。尽管如此，还有其他一些问题，该计划在实践中效果仍然不错。

2、Since wireless is inherently a broadcast （71）, 802.11 radios also have to deal with the problem that multiple transmissions that are sent at the same time will （72）, which may interfere with reception. To handle this problem, 802.11 uses a CSMA (Carrier Sense Multiple Access) scheme that draws on ideas from classic wired Ethernet, which, ironically, drew from an early wireless network developed in Hawaii and called ALOHA. Computers wait for a （73） random interval before transmitting, and defer their transmissions if they hear that someone else is already transmitting. This scheme makes it less likely that two computers will send at the same time. It does not work as well as in the case of wired networks,though.Suppose that computer A is transmitting to computer B, but the radio range of A’s transmitter is too short to reach computer C. If C wants to transmit to B,it can （74） before starting, but the fact that it does not hear anything does not mean that its transmission will succeed. The inability of C to hear A before starting causes some collisions to occur. After any collision, the sender then waits another, longer, random delay and （75） the packet. Despite this and some other issues, the scheme works well enough in practice.
A、 check
B、 arrange
C、 send
D、 listen

答案:D
答题解析:

由于无线在本质上是一种广播媒体，802.11无线电还必须处理同时发送的多个传输将发生碰撞的问题，这可能会干扰接收。为了解决这个问题，802.11使用了CSMA（载波监听多路访问）方案，该方案借鉴了经典有线以太网的想法，具有讽刺意味的是，以太网来自夏威夷早期开发的一个名为aloha的早期无线网络。计算机在传输之前等待一个短的随机间隔，如果听到其他人已经在发送，就会推迟传输。这个方案降低了两台计算机同时发送信息的可能性。不过，它的效果不如有线网络那么好。假设计算机A传输计算机B，但A的发射机的无线电范围太短，不能到达计算机C.如果C想传输B，它可以在开始发送之前监听，但它没有听到任何东西并不意味着它的传输将成功。C在启动前不能听到A，这就会导致发生一些碰撞。在任何碰撞后，发送方都会等待另一个更长的随机延迟并重新传输。尽管如此，还有其他一些问题，该计划在实践中效果仍然不错。

3、Since wireless is inherently a broadcast （71）, 802.11 radios also have to deal with the problem that multiple transmissions that are sent at the same time will （72）, which may interfere with reception. To handle this problem, 802.11 uses a CSMA (Carrier Sense Multiple Access) scheme that draws on ideas from classic wired Ethernet, which, ironically, drew from an early wireless network developed in Hawaii and called ALOHA. Computers wait for a （73） random interval before transmitting, and defer their transmissions if they hear that someone else is already transmitting. This scheme makes it less likely that two computers will send at the same time. It does not work as well as in the case of wired networks,though.Suppose that computer A is transmitting to computer B, but the radio range of A’s transmitter is too short to reach computer C. If C wants to transmit to B,it can （74） before starting, but the fact that it does not hear anything does not mean that its transmission will succeed. The inability of C to hear A before starting causes some collisions to occur. After any collision, the sender then waits another, longer, random delay and （75） the packet. Despite this and some other issues, the scheme works well enough in practice.
A、 stops
B、 discards
C、 retransmits
D、 packages

答案:C
答题解析:

由于无线在本质上是一种广播媒体，802.11无线电还必须处理同时发送的多个传输将发生碰撞的问题，这可能会干扰接收。为了解决这个问题，802.11使用了CSMA（载波监听多路访问）方案，该方案借鉴了经典有线以太网的想法，具有讽刺意味的是，以太网来自夏威夷早期开发的一个名为aloha的早期无线网络。计算机在传输之前等待一个短的随机间隔，如果听到其他人已经在发送，就会推迟传输。这个方案降低了两台计算机同时发送信息的可能性。不过，它的效果不如有线网络那么好。假设计算机A传输计算机B，但A的发射机的无线电范围太短，不能到达计算机C.如果C想传输B，它可以在开始发送之前监听，但它没有听到任何东西并不意味着它的传输将成功。C在启动前不能听到A，这就会导致发生一些碰撞。在任何碰撞后，发送方都会等待另一个更长的随机延迟并重新传输。尽管如此，还有其他一些问题，该计划在实践中效果仍然不错。

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