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Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?（）
- A、Frame Relay
- B、HDLC
- C、x.25
- D、PPP
参考答案
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Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built－in security mechanisms?()
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Which of the following is a connectionless transport layer protocol？（）A、 TCPB、 HTTPC、 SMTPD、 UDP
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Which of the following is a connection oriented transport layer protocol？ （）A、 TCPB、 UDPC、 TFTPD、 SNMP
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单选题Which of the following options lists the steps in PPP session establishment in the correct order?（）A
Optional authentication phase, link establishment phase, network layer protocol phase.B
Network layer protocol phase, link establishment phase, optional authentication phase.C
Network layer protocol phase, optional authentication phase, link establishment phase.D
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Link establishment phase, optional authentication phase, network layer protocol phase.F
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单选题At which layer of the OSI model does the Spanning Tree Protocol （STP） operate at？（）A
Layer 5B
Layer 4C
Layer 3D
Layer 2E
Layer 1
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EAPB
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多选题Which two of these are characteristics of MPLS VPNs?（）ALayer 3 MPLS VPNs can forward only IP packetsBLayer 2 MPLS VPNs can forward any network protocolCMPLS label paths are automatically formed based on Layer 2 framesDLayer 3 MPLS VPNs can forward any network protocol based on Layer 2 framesEIn Layer 2 MPLS VPNS, the service provider controls the customer Layer 3 policies
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ARPB
RARPC
TCPD
UDPE
IPF
ICMPG
BootP
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EAP-TLSB
EAP-MD5C
PAPD
EAP-MSCHAPv2
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多选题Which two of these are characteristics of the 802.1Q protocol?（）Ait is a layer 2 messaging protocol which maintains vlan configurations across network.Bit includes an 8-bit field which specifies the priority of a frame.Cit is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.Dit modifies the 802.3 frame header,and thus requires that the FCS be recomputed.Eit is a trunking protocol capable of carring untagged frames.
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单选题Which of the following is a connection oriented transport layer protocol？ （）A
TCPB
UDPC
TFTPD
SNMP
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单选题Which of the following is a connectionless transport layer protocol？（）A
TCPB
HTTPC
SMTPD
UDP
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