单项选择题Which router is doing LSA type 7 to type 5 translation,and why?()

A.Both RTA and RTB will do LSA7/5 translation,since they are both NSSA ABRs
B.RTA will do LSA7/5 translation,since it has the lower router ID
C.RTB will do LSA7/5 translation,since it has the higher router ID
D.The redistributing router will do LSA7/5 translation,since it is within the NSSA


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1.单项选择题What does the OSPF command capability vrf-lite achieve?()

A.It enables provider edge (PE) specific checks on a router when the OSPF process is associated with the VRF
B.It disables provider edge (PE) specific checks on a router when the OSPF process is associated with the VRF
C.It enables the exchange of the "VRF-Lite" capability when the OSPF adjacency is formed.
D.It disables the MPLS processing on the OSPF learned routes inside the VRF

2.单项选择题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

3.单项选择题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. 

5.单项选择题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

6.单项选择题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

8.单项选择题What are the "bound IP addresses" used for in LDP?()

A.For each such address and mask /32, one label binding is created.
B.As the TCP endpoint, IP addresses are used by the LDP session.
C.These addresses are used to find the label binding to put in the LFIB, by looking up these IP addresses in the routing table.
D.These addresses are used for penultimate hop popping (PHP) when forwarding packets to the next router directly. 

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