Which three of the protocols below belong to the application layer?（）A、ARPB、HTTPSC、SMTPD、CDPE、TFTPF、ICMP

题目

Which three of the protocols below belong to the application layer?（）

A、ARP
B、HTTPS
C、SMTP
D、CDP
E、TFTP
F、ICMP

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第1题：

Which of the protocols below, operates at Layer 2 of the OSI model, and is used to maintain a loop-free network?

A. RIP

B. STP

C. IGRP

D. CDP

E. VTP

F. None of the above

正确答案：B
B 解析：Explanation:
STP (spanning tree protocol) operates on layer 2 to prevent loops in switches and bridges.

Incorrect Answers:
A, C. RIP and IGRP are routing protocols, which are used at layer 3 to maintain a loop free routed environment.

D. CDP does indeed operate at layer 2, but it doest not provide for a loop free topology. CDP is used by Cisco devices to discover information about their neighbors.

E. VTP is the VLAN Trunking Protocol, used to pass VLAN information through switches. It relies on the STP mechanism to provide a loop free network.

第2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3题：

Which three of the protocols below belong to the application layer? (Select three answer choices)

A. ARP

B. HTTPS

C. SMTP

D. CDP

E. TFTP

F. ICMP

正确答案：BCE
B,C,E 解析：Explanation:
The application layer is the highest OSI layer, and protocols at this layer are end-user oriented. HTTPS so people can get information on the internet, SMTP so people can manage networks, and TFTP so people can download files.

Incorrect Answers:
A, D, F. ARP, CDP, ICMP are protocols that equipment like routers and switches use to communicate with themselves, and belong to lower levels on the model.

第4题：

The TCP／IP network model differs from the more popular OSI model. Which of the layers below belong to the TCP／IP model?()

A. application layer

B. session layer

C. transport layer

D. internet layer

E. network layer

F. data link layer

G. physical layer

参考答案：A, C, D

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

参考答案：D, F

第6题：

Which of the protocols below use TCP at the transport layer? (Select four)

A. TFTP

B. SMTP

C. SNMP

D. FTP

E. HTTP

F. HTTPS

正确答案：BDEF
B,D,E,F 解析：Explanation:
SMTP (Simple Mail Transfer Profile for email), FTP (File Transfer Protocol), and HTTP/HTTPS (Hyper Text Transfer Protocol for internet) all use TCP because of the reliable delivery mechanism. SMTP uses TCP port 25, FTP uses TCP ports 20 and 21, HTTP uses TCP port 80, and HTTPS uses TCP port 443.

Incorrect Answers:
A, C: SNMP and TFTP use UDP as the transport mechanism. Generally speaking, protocols that use the keywords "trivial" or "simple" uses UDP, since connectionless, best effort delivery mechanism usually suffice.

第7题：

The Ezonexam network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test? (Choose two)

A．ARP

B．CDP

C．DHCP

D．DNS

E．ICMP

正确答案：AE
解析：Explanation:ARPfindsthehardwareaddressofahostfromaknownIPaddress.Here'showitworks:whenIPhasadatagramtosend,itmustinform.aNetworkAccessprotocol,suchasEthernetorTokenRing,ofthedestination'shardwareaddressonthelocalnetwork.(Ithasalreadybeeninformedbyupper-layerprotocolsofthedestination'sIPaddress.)IfIPdoesn'tfindthedestinationhost'shardwareaddressintheARPcache,itusesARPtofindthisinformation.ICMPworksattheNetworklayerandisusedbyIPformanydifferentservices.ICMPisamanagementprotocolandmessagingserviceproviderforIP.ItsmessagesarecarriedasIPdatagrams.RFC1256isanannextoICMP,whichaffordshosts'extendedcapabilityindiscoveringroutestogateways.Periodically,routeradvertisementsareannouncedoverthenetwork,reportingIPaddressesfortherouter'snetworkinterfaces.Hostslistenforthesenetworkinfomercialstoacquirerouteinformation.Aroutersolicitationisarequestforimmediateadvertisementsandmaybesentbyahostwhenitstartsup.

第8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9题：

Which three of the following OSI model layers also belong to the TCP／IP model?()

A. The application layer

B. The session layer

C. The data link layer

D. The transport layer

E. The network interface layer

F. The physical layer

参考答案：A, D, E

第10题：

A network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test?()

A.ARP

B.CDP

C.DHCP

D.DNS

E.ICMP

参考答案：A, E

Which three of the protocols below belong to the application layer?（）A、ARPB、HTTPSC、SMTPD、CDPE、TFTPF、ICMP

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