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


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1.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

2.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

3.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）

4.多項(xiàng)選擇題MPLS label headers for packet media consist of（）.

A.Version
B.Label
C.COS/EXP
D.TTL
E.S flag

5.單項(xiàng)選擇題In the context of MPLS，what is the correct action to be performed when an aggregate label is received ？（）

A.It adds the VPN label into the top label in the MPLS label stack
B.It replaces the top label in the MPLS label stack with a VPN label and propagates
C.It replaces the bottom label in the MPLS label stack with a VPN label and propagates
D.It removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packets
E.None of above