简答题 BGP使用loopback接口建立邻居的好处？

单项选择题Refer to the exhibit. Look at the command output. What would be the most probable reason for this port-ID mismatch？（）

A.spanning-tree misconfiguration
B.speed mismatch configuration
C.cabling problem
D.configuration problem

多项选择题Refer to the exhibit. According to the output of the command show tag-switching forwarding-table， which four of these statements are true？（）

A.Packets to the IP address 10.10.10.5/32 will be tagged with "17" toward the next hop.
B.Label "19" will be advertised to MPLS neighbors so that they can use this label to reach the IP address 10.10.10.6/32.
C.IP address 10.10.10.4/32 is directly connected to the neighbor router on serial 3/0.
D.Packets arriving with label "17" will be forwarded without any label toward serial 4/0.
E.Packets arriving with label "20" will be forwarded with label "21" after label-swapping.
F.Label "20" is advertised to MPLS neighbors so that they can use this information to reach the prefix 10.10.10.8/32.

多项选择题An802.1Qtrunkisnotcomingupbetweentwoswitches.Theportsonbothswitchesareconfiguredas switchportmodedesirable. Assumingthatthereisnophysicalissue，choosetwopossiblecauses.（）

A.Incorrect VTP domain
B.Incorrect VTP password
C.Incorrect VTP mode
D.Incorrect VTP configuration revision

问答题WRR和SRR的区别是什么？

单项选择题YoureplacedyourLayer3switch，whichisthedefaultgatewayoftheendusers.Manyuserscannotaccessanythingnow，includingemail，Internet，andotherapplications，althoughotherusersdonothaveanyissues.Alloftheapplicationsarehostedinanoutsourceddatacenter.Inordertofixtheproblem，whichoneoftheseactionsshouldyoutake？（）

A.Clear the MAC address table in the switch.
B.Clear the ARP cache in the switch.
C.Clear the ARP cache in the end devices.
D.Clear the ARP cache in the application servers.