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
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A default Frame Relay WAN is classified as what type of physical network?（）
When upgrading the IOS image,the network administrator receives the exhibited error message.What could be the cause of this error?（）
什么是NAT？
Refer to the exhibit.How many broadcast domains exist in theexhibited topology？（）
The following configuration line was added to router R1 Access-list 101 permit ip 10.25.30.00.0.0.255 any What is the effect of this access list configuration?（）
what is four ospf area type？
What is the next state of initial in spanning-tree protocol？
What field in IP packet is used for classification by QOS？
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?（）
Which of the following are key characteristics of PPP?（）