多項(xiàng)選擇題Pick the 4 valid ATM Cell Header fields：（）

A.GFC-4 bits of generic flow control
B.Forward-explicit congestion notification（FECN）
C.VCI-16 bits of virtual channel identifier
D.CLP-1 bit of congestion loss
E.HEC-8 bit of header error control
F.ATM Discard Eligibility（DE）bit


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1.單項(xiàng)選擇題BGP best route selection process is based on what ？（）

A.lowest cost
B.highest bandwidth
C.lowest hop-count
D.path attributes
E.lowest delay

2.多項(xiàng)選擇題Which two statements are true about RPF checks in MSDP（Multicast Source Discovery Protocol）？（）

A.It prevents message looping，Session Advertisement（SA）messages must be RPF checked
B.RPF check should be done against the route to the Rendez-vous Point of the corresponding PIM-SM domain，which originated the SA
C.RPF checking Session Advertisement（SA）messages will cause message looping
D.RPF check should be done against the route to the source S of the corresponding PIM-SM domain

3.單項(xiàng)選擇題The mechanisms for distributing LDP are：（）

A.LDP and RSVP
B.RSVP and CEF
C.CEF and the FIB table
D.UDP and IP
E.A and B

4.單項(xiàng)選擇題The show ip ospf database external command displays information about which OSPF LSA type？（）

A.LSA type 1
B.LSA type 2
C.LSA type 7
D.LSA type 3
E.LSA type 9
F.LSA type 5

5.單項(xiàng)選擇題What is the encapsulation mode for MPLS running on Ethernet？（）

A.Packet mode
B.Frame mode
C.Transparent mode
D.Channel mode
E.Tunnel mode

6.單項(xiàng)選擇題What is the action of "pop" in the context of MPLS switching？（）

A.It removes the top label in the MPLS label stack.
B.It adds a top label in MPLS label stack.
C.It replaces the top label in the MPLS label stack with another value.
D.It replaces the top label in the MPLS label stack with a set of labels.
E.None of above.

7.單項(xiàng)選擇題In which of the following lists of APS Action Requests is the priority correctly arranged from lowest tohighest？（）

A.Wait-to-Restore，F(xiàn)orced Switch，Manual Switch，Lockout of Protection
B.Manual Switch，Wait-to-Restore，Lockout of Protection，F(xiàn)orced Switch
C.Lockout of Protection，F(xiàn)orced Switch， Manual Switch，Wait-to-Restore
D.Lockout of Protection，Manual Switch， Forced Switch，Wait-to-Restore
E.Wait-to-Restore，Manual Switch，F(xiàn)orced Switch，Lockout of Protection
F.Wait-to-Restore，Manual Switch，Lockout of Protection，F(xiàn)orced Switch

9.多項(xiàng)選擇題Which statements are correct for forwarding traffic into MPLS TE tunnels？（）

A.Autoroute causes the tunnel to be treated as a directly connected link to the head-end.
B.Autoroute causes the TE head-end to establish IGP adjacency with the tail-end over the tunnel.
C.Forwarding adjacency makes the TE head-end node advertise the Tunnel LSP into the IGP.
D.Forwarding adjacency supports unequal cost load balancing over multiple TE tunnels.

10.單項(xiàng)選擇題Which of the following statements is correct regarding PIM Sparse Mode operations？（）

A.It does not support all underlying unicast routing protocols like GBP
B.It supports shared trees only assuming all hosts want the multicast traffic
C.Receivers are registered with RP by their first-hop router
D.Receivers are joinedto the Shared Tree（rooted the rp ）by their local Designated Router（DR）
E.From the RP，traffic flows down a Source Tree to each receiver