Question 1

Click on the exhibit.

Initially, all links along the path R1-R2-R4-R6 have 400Mbps unreserved bandwidth and all links along the path

R1-R3-R5-R6 have 800Mbps unreserved bandwidth. Shared Explicit reservation style is used and MakeBefore-Break is enabled. Both fully loose LSPs have been signaled as shown. Later, the configured bandwidth

for LSP-1 is changed to 400Mbps. Which of the following is TRUE?

Options :

A : After a new path for LSP-1 is established on R1-R3-R5-R6, the old path is torn down.

B : After the old path for LSP-1 is torn down, the new path is established on R1-R3-R5-R6.

C : LSP-1 will stay on R1-R2-R4-R6 because there is enough bandwidth on the existing path.

D : LSP-1 will be torn down because CSPF fails to find a new path.

Answer: C

Question 2

True or False? MPLS may use an existing data link layer header field to identify a label, instead of using a specific MPLS header

Options :

A : TRUE

B : FALSE

Answer: A

Question 3

Which of the following regarding label population is TRUE?

Options :

A : Selected labels from the FIB are populated to the LFIB.

B : Selected labels from the RIB are populated to the FIB.

C : Selected labels from the LIB are populated to the FIB.

D : Selected labels from the LIB are populated to the LFIB.

Answer: D

Question 4

Which of the following statements is true when the implicit null is implemented?

Options :

A : The penultimate router will POP the top label from the packets.

B :

The eLER will receive packets with a top label value of 3.

C :

The eLER will receive packets with a top label value of 0.

D :

The penultimate router will always receive unlabeled packets.

E :

The penultimate router performs a double lookup on the packet.

Answer: A

Question 5

An LSP is configured with a fully loose path and CSPF is not enabled. An LSR receives the first PATH message for this LSP. Which of the following is NOT performed by the LSR?

Options :

A : The LSR regenerates and forwards a new PATH message.

B : The LSR stores the PATH message in the PSB.

C : The LSR forwards the PATH message based on the HOP object in the RSB.

D : The LSR looks up the PATH message-s destination IP address in the FIB.

Answer: C

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