單項選擇題What will significantly degrade DSL performance， regardless of DSL rate or line length？ （）

A.Microliters installed between a telephone and shared line
B.POTS splitters at the subscriber’s end of the DSL line
C.POTS splitters at the telco CO
D.None of the other alternatives apply


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2.多項選擇題Which two of the following are designated fields for MAC tunneling protocol（802.1 ah）？（）

A.Service Ethertype
B.ISL
C.PseudoLAN TAG
D.802.1q VLAN TAG
E.Control Word
F.Tunnel Label

3.單項選擇題A Successor is（）.

A.A neighbor that has met the feasibility condition
B.A neighbor that has met the feasibility condition and has the lowest cost path towards the destination
C.Any neighbor that is in the path towards the destination.
D.Any neighbor that is in the path towards the destination and whose reported distance equals thefeasible distance

4.單項選擇題Routes redistributed into an OSPF ASBR are which LSA type？（）

A.LSA type 1
B.LSA type 2
C.LSA type 3
D.LSA type 4
E.LSA type 5
F.LSA type 6

5.單項選擇題What is used as label in cell-based MPLS ？（）

A.VPI
B.VCI
C.VPI and VCI
D.Specific 4 bytes label
E.None of above