多項選擇題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.


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1.單項選擇題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

2.單項選擇題What does the protocol field inside the PPP frame indicate？（）

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

3.多項選擇題Which three configuration options are available for configuring the l2tp-class command in L2TPv3？（）

A.TCP port
B.authentication
C.IP DF bit
D.retransmit retries
E.sequencing
F.hostname

4.單項選擇題Which BGP attribute can be used to influence inbound traffic flow？（）

A.cluster ID
B.Weight
C.MED
D.local preference
E.aggregate

5.多項選擇題What are the two benefits of graceful restart？（）

A.Graceful restart allows session information recovery without disruption to the network.
B.A node can perform a graceful restart to help a neighbor recover its state. The label bindings are kepton state information， which helps the failed node recover faster and does notaffect the current for wardtraffic.
C.Graceful restart allows a node to recover state from its neighbor when there is no RP or before thedevice undergoes SSO.
D.Graceful restart does not allow session information recovery.
E.During a graceful restart， the router removes any stale prefixes after a timer for stale entries expires