R1，R2，R3 are all in same ospf area， there is a virtual link between R1 and R3. Pls answer： Are the hello packets exchanged between the virtual link？
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A.upon a port state change
B.upon receiving a topology change notification
C.when transitioning from discarding to forwarding
D.when transitioning from forwarding to discarding
E.only when changing from listening to discarding
F.when CAM resources have been completely used up
A.it is newer
B.it has smaller timers
C.it has less overhead
D.it is not timer-based
Refer to the exhibit. Which of these is applied to the Bearer class？（）
A.WRED
B.traffic shaping
C.packet marking
D.packet classification
E.FIFO queuing within the class
Refer to the exhibit. Which switching feature is being tested？（）
A.loop guard
B.PortFast
C.root guard
D.BDPU guard
Refer to the exhibit. Voice traffic is marked "precedence 5." How much bandwidth is allocated for voice traffic during periods of congestion？（）
A.a minimum of 48 kb/s
B.a maximum of 48 kb/s
C.a minimum of 48% of the available bandwidth
D.a maximum of 48% of the available bandwidth
As 2 產(chǎn)生A的BGP路由，R1上分別設(shè)置了weight， local-precedence如圖所示：?jiǎn)朢1要到A，把數(shù)據(jù)包給誰(shuí)？
A.loop guard
B.storm control
C.storm suppression
D.broadcast suppression
E.BPDU guard
Refer to the exhibit. In the diagram, the switches are running IEEE 802.1w RSPT. On which ports should root guard be enabled in order to facilitate deterministic root bridge election under normal and failure scenarios? （）
A.GE-3/1，GE-3/2
B.FE-2/1，F(xiàn)E-3/2
C.GE-1/1，GE-1/2
D.GE-4/1，GE-4/2
E.GE-2/1，GE-2/2
F.GE-3/1，GE-3/2，GE-4/1，GE-4/2，F(xiàn)E-2/1，F(xiàn)E-3/2
Refer to the exhibit. In the diagram, the switches are running IEEE 802.1s MST. Which ports are in the MST blocking state?（）
A.GE-1/2 and GE 2/1
B.GE-1/1 and GE-2/2
C.GE-3/2 and GE 4/1
D.no ports are in the blocking state
E.There is not enough information to determine which ports are in the blocking state
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Refer to the exhibit.The network administrator is in acampus building distant from Building B.WANRouter is hosting a newly installed WAN link on interface S0/0.The new link is not functioning and the administrator needs to determine if the correct cable has been attached to the S0/0 interface.How can the administrator accurately verify the correct cable type on S0/0 in the most efficient manner?（）
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