Nokia SRC Certification 4A0-C01 Questions & Answers

• Question 31:

  

  Router R2 advertises an OSPF summary route 10.10.10.0/24 into Area 1. Router R3 receives labels for individual FECs 10.10.10.2/32 and 10.10.10.4/32. These two FECs are installed in router R3's LIB but not in the LFIB. What needs to be done on router R3 to install these labels into its LFIB?

  A. Disable route summarization on router R3.

  B. Enable LDP aggregate prefix match.

  C. Create an import policy to accept 10.10.10.2/32 and 10.10.10.4/32.

  D. Disable LDP exact match on 10.10.10.2/32 and 10.10.10.4/32.

  Correct Answer: B

• Question 32:

  All links are of equal cost. A CSPF enabled LSP is configured on routers R1 to R6. Its fully loose primary

  path is configured with an "exclude green" statement and the fully loose secondary path is configured with

  an "exclude red" statement.

  Which paths will be taken by this LSP?

  

  A. The primary path will take R1-R3-R2-R4-R6. The secondary path will take R1-R3-R5-R6.

  B. The primary path will take R1-R3-R5-R4-R6. The secondary path will take R1-R3-R2-R4-R5-R6.

  C. The primary path will take R1-R3-R5-R6. The secondary path will take R1-R3-R2-R4-R5-R6.

  D. The primary path will take R1-R3-R5-R6. The secondary path will take R1-R3-R2-R4-R6.

  Correct Answer: D

• Question 33:

  Which of the following about CAC is FALSE?

  A. CAC is used when the LSP path has not been computed by CSPF.

  B. CAC is used when the LSP path has been computed by CSPF.

  C. CAC is used to perform a bandwidth check on each egress interface of the downstream router.

  D. CAC is used to perform a bandwidth check based on the router's LSDB.

  Correct Answer: D

• Question 34:

  All links have 1Gbps unreserved bandwidth initially and all LSPs have the least-fill feature enabled. After

  the two LSPs have been signaled as shown, two additional LSPs are configured. LSP-3 is signaled first

  with bandwidth of 300Mbps.

  LSP-4 is signaled after with bandwidth of 400Mbps. Which paths will CSPF choose for LSP-3 and LSP-4?

  

  A. LSP-3 takes R1-R3-R5-R6 and LSP-4 takes R1-R2-R4-R6.

  B. LSP-3 takes R1-R2-R4-.R6 and LSP-4 takes R1-R3-R5-R6.

  C. Both LSP-3 and LSP-4 take R1-R3-R5-R6.

  D. Both LSP-3 and LSP-4 take R1-R2-R4-R6.

  E. CSPF randomly chooses one of the equal cost paths for the two LSPs.

  Correct Answer: C

• Question 35:

  Which of the following about IS-IS Traffic Engineering on a Nokia 7750 SR is FALSE?

  A. Traffic engineering information is carried in the extended TLVs.

  B. Traffic engineering must be enabled on all IP/MPLS routers along the LSP path.

  C. Traffic engineering information is stored in the opaque database.

  D. Traffic engineering is required for constraint-based LSPs.

  Correct Answer: C

• Question 36:

  Which of the following about RSVP refresh reduction on a Nokia 7750 SR is FALSE?

  A. RSVP generates a summary refresh message for each LSP.

  B. Message-IDs replace individual refresh messages.

  C. An LSP state change causes the Message-ID to be incremented.

  D. RSVP refresh reduction is disabled by default.

  Correct Answer: A

• Question 37:

  When the link between routers R4 and R6 goes down, what will router R1 do?

  

  A. Router R1 will signal the secondary path and switch traffic to it.

  B. Router R1 will discard traffic because the secondary path is not a fully strict path.

  C. Router R1 will switch traffic to the secondary path right after it is notified of the link error.

  D. Router R1 will discard traffic until a new IGP route to router R6 is re-calculated.

  Correct Answer: A

• Question 38:

  LSP "toR4" requests fast reroute protection. What could be done to remove the Failure Code shown?

  

  A. The LSP must be enabled with CSPF on the head-end router.

  B. Fast reroute must be enabled on the downstream routers.

  C. A mixture of strict and loose hops must be defined in the primary path.

  D. CSPF and fast reroute must be enabled on all downstream routers.

  Correct Answer: A

• Question 39:

  Which of the following about MPLS shortcuts for BGP on a Nokia 7750 SR is FALSE?

  A. BGP-sourced traffic is label switched through the core.

  B. Both LDP and RSVP- based tunnels can be used.

  C. IGP forwarding is used by default if no MPLS tunnel is available.

  D. CSPF is required for MPLS shortcuts to work.

  Correct Answer: D

• Question 40:

  Given the output below, which of the following is FALSE?

  

  A. A packet arriving with label 262142 will be forwarded out interface 1/1/3 with label 262143.

  B. The router is an egress router for FEC 10.10.10.1/32.

  C. There are multiple LSPs to reach FEC 10.10.10.4/32.

  D. The router's system address is 10.10.10.3/32.

  Correct Answer: A