Nokia SRC Certification 4A0-C01 Questions & Answers

• Question 21:

  RSVP session state for LSP 1 has timed out on router R3. Which of the following actions will router R3 initiate to clear the RSVP session?

  

  A. Send a PATH Tear message toward router R6.

  B. Send a PATH Tear message toward router R1.

  C. Send a PATH Error message toward router R6.

  D. Send a PATH Error message toward router R1.

  Correct Answer: D

• Question 22:

  If a Nokia 7750 SR is an iLER operating in pipe mode, which of the following regarding the TC field (EXP bits) is TRUE?

  A. The TC field is set based on the value of the DSCP field inside the customer packet.

  B. The TC field is set to a specific value via explicit administrative configuration.

  C. The TC field is set to a system generated random number.

  D. The TC field is set by the eLER.

  Correct Answer: B

• Question 23:

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

  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 ERO.

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

  Correct Answer: C

• Question 24:

  An LDP tunnel is established on R1-R2-R4-R6 because the link between routers R3 and R6 is down. With the LDP-IGP Sync feature enabled and after the link is restored, which of the following is FALSE?

  

  A. Router R3 starts the LDP-Sync timer after recovering the LDP session on R3-R6.

  B. Router R1 continues to use R1-R2-R4-R6 until the LDP-Sync feature is disabled.

  C. Router R3 advertises the maximum metric for the link to router R6.

  D. Router R1 receives a label from router R3 after the LDP session is established on R3-R6.

  Correct Answer: B

• Question 25:

  A fully loose LSP "toR6" is enabled with FRR protection. All links have the same cost. After the link between R2 and R4 goes down, FRR protection repairs the LSP and traffic traverses on R1-R2-R7-R8-R4R6. By default, which of the following about this LSP on a Nokia 7750 SR is FALSE?

  

  A. The LSP will switch to R1-R3-R5-R6 after the resignal timer expires.

  B. The old primary path and its detours are torn down after the new primary path is established.

  C. CSPF must be enabled to find a more optimal path.

  D. The traffic is switched to R1-R3-R5-R6 in an MBB fashion.

  Correct Answer: A

• Question 26:

  Why might router R2 have a Link LDP session to R1 (10.10.10.1:0) but not to R3 (10.10.10.3:0)?

  

  A. MPLS is not configured on R2.

  B. R2 does not have a route to 10.10.10.3.

  C. LDP is not configured on R3's interface to R2.

  D. The targeted session is not configured on R2.

  Correct Answer: C

• Question 27:

  Which of the following messages is NOT used in T-LDP operation?

  A. Hello message

  B. Init message

  C. Keepalive message

  D. Label Mapping message

  E. ACK message

  Correct Answer: E

• Question 28:

  What labels are encapsulated in the tunnels used by a 6PE deployment?

  A. The inner label is the IPv4 Explicit Null. The outer label is the MPLS transport label.

  B. The inner label is an MPLS transport label. The outer label is the IPv4 Explicit Null.

  C. The inner label is the IPv6 Explicit Null. The outer label is an MPLS transport label.

  D. The inner label is an MPLS transport label. The outer label is the IPv6 Explicit Null.

  Correct Answer: C

• Question 29:

  The LSP "toR6" is configured with a fully strict path on a Nokia 7750 SR. Which of the following configurations is required to enable fast reroute for this LSP?

  

  A. Enable fast-reroute on all routers along the path, R1, R2, R4, and R6.

  B. Enable both link-protection and node-protection on router R1.

  C. Enable fast-reroute with either one-to-one or facility mode on this LSP.

  D. Enable link-protection only on router R4.

  Correct Answer: C

• Question 30:

  Two LSPs traverse the path R1-R2-R3. Both LSPs are configured with facility fast reroute and link protection. When router R1 is the PLR, which router becomes the Merge Point (MP) for this LSP?

  

  A. Router R1

  B. Router R2

  C. Router R3

  D. Router R4

  E. Router R5

  Correct Answer: B