單項選擇題Which statement best describes OSPF external LSAs (type 5)?()

A.OSPF external LSAs are automatically flooded into all OSPF areas, unlike type 7 LSAs, which require that redistribution be configured.
B.External LSAs (type 5) are automatically changed to type 1 LSAs at ASBRs.
C.Type 5 LSAs are route summaries describing routes to networks outside the OSPF Autonomous System.
D.External network LSAs (type 5) redistributed from other routing protocols into OSPF are not permitted to flood into a stub area


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1.單項選擇題Which statement is true of a source that wants to transmit multicast traffic to group 239.1.1.1?()

A.Before sending traffic, it must first join  multicast group 239.1.1.1 by sending an IGMPv2 membership report to the default router on the local subnet.
B.It must send an IGMPv2 Request to Send  packet and then wait for an IGMPv2 Clear to Send packet from the IGMPv2 querier router on the local subnet
C.It may begin transmitting multicast traffic to the group only when there is no other host transmitting to the group on the local subnet.
D.It may transmit multicast traffic to the group at any time. 

3.單項選擇題What is the STP root guard feature designed to prevent?()

A.a root port being transitioned to the blocking state
B.a port being assigned as a root port
C.a port being assigned as an alternate port
D.a root port being transitioned to the forwarding state

4.單項選擇題IEEE 802.1w is a Rapid Spanning Tree Protocol (RSTP) that can be seen as an evolution of the 802.1 standard. What are the port roles described by 802.1w?()

A.root port,designated port,alternate port,backup port,and disabled
B.standby port,alternate port,root port,and disabled
C.standby port,designated port,backup port,and disabled
D.root port,designated port,alternate port,and standby port

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