單項(xiàng)選擇題What is the importance of using Virtual Output Queues on ingress Line Cards in a high-end router？（）

A.Prevents head-of-line blocking
B.Uses less memory
C.Increases forwarding performance
D.Simplifies configuration


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1.單項(xiàng)選擇題In Any Transport over MPLS （AtoM） Control word is an optional 4-byte field used in the pseudowire packet.The control word carries generic and Layer 2 payload-specific information to emulate L2 packets correctly.In pseudowire packet， where is this Control Word inserted？（）

A.Inserted between the MPLS label stack and the Layer 3 payload
B.Inserted between the MPLS label stack and the Layer 3 Header
C.Inserted between the MPLS label stack and the Layer 2 payload
D.Inserted between the MPLS label stack and the Layer 2 header

2.單項(xiàng)選擇題What best explains the BGP route-reflector function？（）

A.BGP route-reflector should be in forwarding path of data coming from its clients
B.BGP route-reflector does not have to be in the forwarding path of data coming from its clients
C.BGP route-reflector will stop reflecting the routes if they’re not directly-connected clients
D.None of the above

3.單項(xiàng)選擇題Which of the following events can NOT be tuned via router configuration to provide for faster convergencefollowing a link failure？（）

A.Failure detection
B.Failure reporting
C.IGP LSP/LSA originatio
D.Per-hop flooding time of new link state
E.Number of hops that need to be notified of new link state

4.單項(xiàng)選擇題What is a limitation of implementing uRPF？（）

A.MPLS LDP must be enabled.
B.BGP routing protocol must be running.
C.Named access-lists must be configured.
D.Symmetrical routing is required.
E.Domain name must be defined

5.單項(xiàng)選擇題The above bgp configuration has what effect on the configured router？（）

A.Allows incoming TCP connections destined to port 179
B.Allows incoming TCP connections sourced from port 179
C.Allows incoming TCP connections from 1.1.1.1 and destined to，or sourced from port 179
D.Allows incoming TCP connections from 1.1.1.1 that are destined to port 179
E.Allows incoming TCP connections from 1.1.1.1 that are sourced from port 179

6.多項(xiàng)選擇題Which two are characteristics of an IPv6 multicast address？（）

A.First （most significant ） octet is FF in hex
B.Starts with a prefix of FE80 to FEBF in hex
C.Starts with a prefix of FECO to FEFF in hex
D.Second octet contains a 4-bit multicast scope field
E.Last 64 bit contains the modified MAC address of the Ethernet interface
F.Is allocated from the unicast address space

7.多項(xiàng)選擇題n the case of Ethernet transport， which two types of attachment circuits does L2TPv3 support？ （）

A.port tunneling on the Ethernet subinterface
B.VLAN tunneling on the Ethernet trunk
C.port tunneling on the Ethernet interface
D.VLAN tunneling on the Ethernet VLAN subinterface
E.port tunneling on the Ethernet trunk

8.多項(xiàng)選擇題Packed Cell Relay encapsulation with AToM inclues which of the following？（）

A.Tunnel label
B.VC-label
C.5-byte ATM header
D.Payload
E.4 byte ATM header
F.Support for 30 packed cells

9.多項(xiàng)選擇題Which are correct descriptions and configurations of Anycast RP？（）

A.In Anycast RP， two or more RPs are configured with the same IP address on loopback interfaces.
B.Anycast RP provides redundancy and load-sharing capabilities.
C.Routers with Anycast RP can be configured statically （loopback 1.1.1.1）with the command ip pim rp-address 1.1.1.1
D.Routers with Anycast RP can be configured statically （loopback 1.1.1.1）with the command ip rp-address pim 1.1.1.1
E.Routers with Anycast RP can be configured statically （loopback 1.1.1.1）with the command ip anycast-rp pim 1.1.1.1

10.單項(xiàng)選擇題Which of the following IOS features can prevent IP spoofing attacks？（）

A.PPP over Ethernet
B.Cisco Express forwarding
C.MPLS traffic Engineering
D.IS-IS routing
E.Unicast Reverse Path Forwarding（uRPF）