QUESTION: 77

LDP uses Discovery messages to discover neighbors through different neighbor discovery mechanisms. Which of the following statements regarding basic discovery mechanisms are true? (Multiple Choice)

The destination IP address of the LDP Discovery message is the multicast IP address 224.0.0.2.
The LDP Discovery message is sent to the specified LDP peer.
The LSRdoes not send Hello messages any longer after TCP connections are established.
The LDP Discovery message is encapsulated into a UDP packet and its destination port number is 646.

Answer(s): A,D

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QUESTION: 78

MPLS can forward packets only after an LSP is established. Which of the following statements regarding static LSP establishment are true? (Multiple Choice)

After a static LSP is established, each node on the LSP can detect the entire LSP.
When MPLS is enabled on the outbound interface of the ingress node and the physical status and the protocol status of the outbound interface are Up, the static LSP is Up regardless of whether there is an egress node or a transit node.
The transit node of a static LSP is configured and MPLS is enabled on both the inbound and outbound interfaces. If the physical status and the protocol status of the inbound and outbound
interfaces are Up, the static LSP is Up.
The egress node of the static LSP is configured and MPLS is enabled on the inbound interface. If the physical status and the protocol status of the inbound interface are Up, the static LSP is Up regardless of whether there is an ingress node or a transit node.

Answer(s): C,D

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QUESTION: 79

The traditional tail drop method is used for packet loss, which causes global TCP synchronization.

TRUE
FALSE

Answer(s): A

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QUESTION: 80

The TTL field encapsulated to the MPLS label header can prevent infinite loops of MPLS packets. Which of the following statements regarding the TTL field are true? (Multiple Choice)

MPLS encapsulation in frame mode supports the TTL field. MPLS encapsulation in cell mode does not support the TTL field.
MPLS provides two processing modes on the TTL field: 1. TTL in the MPLS header copies the IP TTL value when an IP packet enters the MPLS network. 2. The ingress LER sets the TTL value in the MPLS header to 255.
The processing of IP TTL copy hides the LSR in a MPLS domain, improving the network security.
If TTL copy is disabled, users can use the tracert function to view the LSR of the MPLS domain.

Answer(s): A,B

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