单项选择题
On point-to-point networks, OSPF hello packets are addressed to which address?（）
A.127.0.0.1
B.172.16.0.1
C.192.168.0.5
D.223.0.0.1
E.224.0.0.5
F.254.255.255.255
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In order to allow the establishment of a Telnet session with a router, which set of commands must be configured?（）
A.A
B.B
C.C
D.D
E.E
F.F -
单项选择题
Whiletroubleshootinganetworkconnectivityproblem,atechnicianobservessteadylinklightsonboththeworkstationNICandtheswitchporttowhichtheworkstationisconnected.However,whenthepingcommandisissuedfromtheworkstation,theoutputmessage"Requesttimedout."isdisplayed.AtwhichlayeroftheOSImodeldoestheproblemmostlikelyexist?（）
A.the session layer
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D.the access layer
E.the network layer
F.the application layer -
多项选择题
WhichtwovaluesareusedbySpanningTreeProtocoltoelectarootbridge?(Choosetwo.)（）。
A.amount of RAM
B.bridge priority
C.IOS version
D.IP address
E.MAC address
F.speed of the links
