多项选择题

Which four of these key points should be considered during implementation of PPPoA architecture？（）

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

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单项选择题

Where is the MPLS label imposed？（）

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

Which three statements about the BGP next-hop attribute are true？（）

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

What is the port number of the IPsec Authentication Header packet？（）

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