多项选择题

Which two statements about forwarding equivalence class （FEC） are true？（）

A.FEC might correspond to a destination IP subnet， but it might also correspond to any traffic class that the edge LSR considers significant.
B.FEC is a group of IP packets that is forwarded over a different path， but with the same forwarding treatment.
C.FEC is a group of IP packets that is forwarded over the same path， and with the same forwarding treatment.
D.FEC is a group of IP packets that is forwarded over a different path， but with the different forwarding treatment.
E.FEC is a group of IP packets that is forwarded over the same path， but with a different forwarding treatment

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多项选择题WhichfourofthesekeypointsshouldbeconsideredduringimplementationofPPPoAarchitecture？（）

A.the number of subscribers that will be serviced currently and in the future because this affects the number of required PPPoA sessions
B.The types of applications that the NSP offers to the end subscriber
C.The capacity of ATM and Frame Relay interworking on the NSP
D.in the case of more than one user， whether all users need to reach the same final destination orservice，or they all have different service destinations
E.Whether the service provider or the final service destination is providing the IP address to the CPE of the subscriber

单项选择题WhereistheMPLSlabelimposed？（）

A.after the Layer 3 header and before the Layer 2 payload
B.after the Layer 3 header and before the Layer 4 payload
C.after the Layer 2 header and before the Layer 1 payload
D.after the Layer 1 header and before the Layer 2 payload
E.after the Layer 2 header and before the Layer 3 payload

多项选择题WhichthreestatementsabouttheBGPnext-hopattributearetrue？（）

A.EBGP sessions between confederation sub ASs do not modify the next-hop attribute.
B.By default， iBGP sessions change the next-hop attribute learned from eBGP peers to self address.
C.By default， the next-hop attribute is not changed when a prefix is reflected by the route reflector
D.EBGP sessions between confederation sub ASs change the next-hop attribute to peer address.
E.By default， iBGP sessions preserve the next-hop attribute learned from eBGP peers.

单项选择题WhatistheportnumberoftheIPsecAuthenticationHeaderpacket？（）

A.IP protocol 50
B.TCP port 51
C.UDP port 50
D.IP protocol 51
E.UDP port 51
F.TCP port 50

单项选择题WhatdoestheprotocolfieldinsidethePPPframeindicate？（）

A.the protocol used to determine the authentication method
B.the protocol used to identify the data in the Information field
C.the protocol used to carry the PPP frame
D.the protocol used to decode the FCS field
E.the protocol used to detect the number of padding bytes