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A receiving host computes the ch

题目

A receiving host computes the checksum on a frame and determines that the frame is damaged.The frame is then discarded.At which OSI layer did this happen?（）

  • A、session
  • B、network
  • C、physical
  • D、data link
  • E、transport
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相似问题和答案

第1题：

Does that include the turnover()in advance?

A、 to receive

B、 received

C、 receiving


参考答案：B

第2题：

Every host and router on the Internet has an IP address, which encodes its(12).

A．host number

B．network number

C．host number and socket

D．host number and network number


正确答案：D

第3题：

2．I prefer _______ a small gift that has some thought behind it rather than some money．

A． to receive; to getting

B． receiving; getting

C． to receive ; get

D． receiving; get


正确答案：C
2．C【解析】考查“prefer to do sth. rather than do sth.”的用法，表示“宁愿作……而不愿做……”。故答案为C。

第4题：

You‘re the systems administrator at Testing, and you create the following access control lists.You then enter the command "ip access-group 101 in" to apply access control list 101 to router TK1s e0 interface.Which of the following Telnet sessions will be blocked as a result of your access lists?（）

A. Telnet sessions from host A to host 5.1.1.10

B. Telnet sessions from host A to host 5.1.3.10

C. Telnet sessions from host B to host 5.1.2.10

D. Telnet sessions from host B to host 5.1.3.8

E. Telnet sessions from host C to host 5.1.3.10

F. Telnet sessions from host F to host 5.1.1.10


参考答案：D, F

第5题：

By default, which IS－IS metric types does JUNOS software support?()

A. receiving of wide metrics only

B. sending of narrow metrics only

C. receiving of narrow metrics only

D. sending and receiving of narrow and wide metrics


参考答案：D

第6题：

下列化合物哪一个存在共轭体系。()

A.CH-CH=CH2

B.CH3-CH=CH-CH2-CH=CH2

C.CH3-CH=CH-CH=CH2

D.CH3-C≡C-CH3

E.CH3-CH2- -CH3


参考答案：C

第7题：

Host A opens a Telnet connection to Host B. Host A then opens another Telnet connection to Host B. These connections are the only communication between Host A and Host B. The security policy configuration permits both connections.How many sessions exist between Host A and Host B?（）

A.1

B.2

C.3

D.4


参考答案：B

第8题：

Every host and router on the Internet has an IP address, which encodes its

A．host number

B．host number and socket

C．network number

D．host number and network number


正确答案：D

第9题：

A receiving host has failed to receive all of the segments that it should acknowledge.

What can the host do to improve the reliability of this communication session?

A．Start a new session using UDP

B．Obtain a new IP address from the DHCP server

C．Use a different source port for the session

D．Decrease the sequence number

E．Decrease the window size


正确答案：E
解析：Explanation:
A TCP window the amount of outstanding (unacknowledged by the recipient) data a sender can send on a particular connection before it gets an acknowledgment back from the receiver that it has gotten some of it.

For example if a pair of hosts are talking over a TCP connection that has a TCP window size of 64 KB (kilobytes), the sender can only send 64 KB of data and then it must stop and wait for an acknowledgment from the receiver that some or all of the data has been received. If the receiver acknowledges that all the data has been received then the sender is free to send another 64 KB.

One way to improve the reliability of the TCP connection is to reduce the window size that the receiver needs to receive before sending an acknowledgement. However, this will reduce throughput as more segments and acknowledgements will need to be sent in order to transfer the same amount of data.

第10题：

A receiving host computes the checksum on a frame and determines that the frame is damaged.The frame is then discarded.At which OSI layer did this happen?()

A. session

B. network

C. physical

D. data link

E. transport


参考答案：D

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