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

6.單項選擇題Which of the following IOS commands can detect whether the SQL slammer virus propagates in yournetworks？（）

A.access-list 100 permit any any udp eq 1434
B.access-list 100 permit any any udp eq 1434 log
C.access-list 110 permit any any udp eq 69
D.access-list 110 permit any any udp eq 69 log
E.None of above.

7.單項選擇題What statement is true？（）

A.Link Control Protocol（LCP） is used for basic PPP link setup and operation
B.Link Control Protocol（LCP） is used for denying PPP connections to unauthorized devices.
C.Link Control Protocol（LCP） for PPP is synonymous to ARP for Ethernet.
D.None of the above

9.單項選擇題In which state can BGP peers exchange Update messages？（）

A.Active
B.OpenSent
C.OpenConfirm
D.Established
E.Idle

10.單項選擇題In PIM-SM operations， the first router connected to the multicast source sends the Register message towhich device？（）

A.Multicast source
B.Multicast receiver
C.RP
D.RP mapping agent
E.Designated Router （DR）