問答題SRR？

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1.單項選擇題

Refer to the exhibit. BGP-4 routing to the Internet，in normal behavior，may create asymmetrical routing for different prefixes. The BGP routing table indicates that traffic should follow the paths indicated in the exhibit，but packets are not going further than the border router in AS 4. What could be the cause of this problem？（）

A.TCP Intercept is configured in AS 4.
B.Unicast Reverse Path Forwarding is configured in loose mode in this router.
C.Packets may be leaving AS 1 without the BGP routing flag set to 1.
D.Unicast Reverse Path Forwarding is configured in strict mode in this router.
E.There is a missing Unicast Reverse Path Forwarding configuration.

3.問答題WRR？
7.多項選擇題The network administrator is trying to add Switch1 to the network， but the 802.1Q trunk is not coming up. Switch1 was previously tested in the laboratory and its trunk configuration worked fine. What are three possible causes of this problem？ （）

A.The trunking configuration mode on Switch1 is set to Off.
B.The trunking configuration mode on the other end is set to On.
C.The trunking configuration mode on the other end is set to Desirable.
D.Cisco Discovery Protocol is not running on the other end.
E.There is a VTP domain name mismatch.
F.Switch1 does not support 802.1Q.

10.多項選擇題

Refer to the exhibit. Two ISPs have decided to use MSDP and configured routers X and Y (both are PIM RPs) as MSDP peers. In the domain of ISP B, PC A has sent an IGMP membership report for the group 224.1.1.1 and PC B has sent an IGMP membership report for the group 224.5.5.5. Assuming that the MSDP peering relationship between routers X and Y is functional, and given the partial configuration output shown from router X, which two of these statements are true?（） 

A.Router X will contain an entry for 224.1.1.1 in its SA cache and will also have an installed （S，G） entry for this in its mroute table.
B.Router X will not contain an entry for 224.1.1.1 in its SA cache but will have an installed （*，G） entry for this in its mroute table.
C.Router X will not contain an entry for 224.5.5.5 in its SA cache but will have an installed （S，G） entry for this in its mroute table.
D.Router X will not contain an entry for 224.5.5.5 in its SA cache but will have an installed （*，G） entry for this in its mroute table.
E.Router X will have no entries for 224.5.5.5 in neither its SA cache nor in its mroute table.
F.Router X will have no entries for 224.1.1.1 in neither its SA cache nor in its mroute table.