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单选题Which of the following protocols use both TCP and UDP ports?（）A FTPB SMTPC TelnetD DNSE All of the above

题目
单选题
Which of the following protocols use both TCP and UDP ports?（）
A

FTP

B

SMTP

C

Telnet

D

DNS

E

All of the above

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相似问题和答案

第1题：

A zone transfer occurs over which of the following ports?()

A.TCP 53

B.UDP 67

C.UDP 123

D.TCP 25


参考答案：A

第2题：

Which of these ports does syslog use to send messages to a syslog server?()

A.TCP502

B.TCP514

C.TCP520

D.UDP502

E.UDP514

F.UDP520


参考答案：E

第3题：

Which one of the following protocols uses both UDP and TCP ports for the transport layer operation?

A．FTP

B．TFTP

C．SMTP

D．Telnet

E．DNS


正确答案：E
解析：Explanation:TCPandUDPmustuseportnumberstocommunicatewiththeupperlayers.Portnumberskeeptrackofdifferentconversationscrossingthenetworksimultaneously.Originating-sourceportnumbersaredynamicallyassignedbythesourcehost,whichwillbesomenumberstartingat1024.1023andbelowaredefinedinRFC1700,whichdiscusseswhatiscalledwell-knownportnumbers.Virtualcircuitsthatdonotuseanapplicationwithawell-knownportnumberareassignedportnumbersrandomlychosenfromwithinaspecificrangeinstead.TheseportnumbersidentifythesourceanddestinationhostintheTCPsegment.OnlyDNSusesbothUDPandTCPport53.

第4题：

Which of these ports does syslog use to send messages to a syslog server?（）

  • A、TCP502
  • B、TCP514
  • C、TCP520
  • D、UDP502
  • E、UDP514
  • F、UDP520

正确答案:E

第5题：

Which of the following protocols utilize UDP as the layer 4 transport mechanism?（）

  • A、TACACS
  • B、Telnet
  • C、SMTP
  • D、SNMP
  • E、HTTP
  • F、TFTP

正确答案:D,F

第6题：

Which of the following protocols use both TCP and UDP ports?()

A. FTP

B. SMTP

C. Telnet

D. DNS

E. All of the above


参考答案：D

第7题：

Which of the following protocols use both TCP and UDP ports?（）

  • A、FTP
  • B、SMTP
  • C、Telnet
  • D、DNS
  • E、All of the above

正确答案:D

第8题：

Which of the following protocols can be found at the application layer?()

A.Telnet

B.TCP

C.SNMP

D.UDP


参考答案：A

第9题：

Which one of the following protocols uses both UDP and TCP ports for the transport layer operation?（）

  • A、FTP
  • B、TFTP
  • C、SMTP
  • D、Telnet
  • E、DNS

正确答案:E

第10题：

Which two ports are used with RADIUS authentication and authorization？（）

  • A、UDP port 1812
  • B、UDP port 2000
  • C、TCP port 2002
  • D、UDP port 1645

正确答案:A,D

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