QUESTION: 125

Router HW1 functions as an MPLS LSR router on the carrier’s network. The router receives a labelled packet, but the label entry does not exist in the router’s LFIB. Given this information, how will the router process the packet?

Router HW1 discards the packet.
Router HW1 uses the default label to forward the packet.
Router HW1 removes the label, searches the FIB, and uses the destination IP address to forward the packet.
Router HW1 uses LDP to create an LSP and creates a path in its LFIB for the label carried in the packet.

Answer(s): A

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QUESTION: 126

Which of the following statements regarding the basic MPLS forwarding process is false?

When an IP packet enters an MPLS domain, the device checks whether the tunnel ID corresponding to the destination IP address of the packet is 0x0. If so, the MPLS forwarding process starts.
By default, the egress node supporting PHP allocates the label with the value of 3 to the penultimate hop.
A transit node replaces a label on the top of the label stack in an MPLS packet with the label assigned by the next hop.
When an IP packet enters an MPL5 domain, the MPLS edge device inserts a new label between the Layer 2 header and the IP header of the packet.

Answer(s): A

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QUESTION: 127

In which of the following scenarios will gratuitous ARP packets be sent?

A host connected to the switch sends a ping packet.
The DHCP client receives an acknowledgment message from the server
A new host with an IP address is connected to the network.
The master and backup devices are elected in VRRP.

Answer(s): D

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QUESTION: 128

What is the function of Route Target (RT) on an MPLS VPN?

Allows the remote PE to determine which VPNv4 routes should not be imported to a specific VRF instance.
Allows the remote CE to determine which VPNv4 routes be imported to a specific VRF instance.
Allows the remote PE to determine which VPNv4 routes be imported to a specific VPN routing and forwarding (VRF) instance.
Allows the remote CE to determine which VPNv4 routes should not be imported to a specific VRF instance.

Answer(s): C

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