Free Nokia 4A0-255 Exam Dumps Questions & Answers

Consider the exhibit. The grey sites (Site 1 through Site6) from an existing network, which will be extended by adding Site7 and Site8. Which of the following is NOT a common source of interoperability issues for this network extension?

• A.  Cascading in the existing network
• B.  Regeneration requirements at Site5
• C.  Fiber connectors at Site6
• D.  Spectrum grid of the extension

Consider the exhibit shows the standard 8-step network design process. Suppose that you have used this process to design a Green filed network, which has been commissioned and is in operation. The customer now requests an extension to the network to accommodate more steps and traffic. Which steps are not required when designing such an extension?

• A.  Step2 (Analyze Available) and Step 8 (Analyze Cost).
• B.  Step (Define Network Architecture ) and Step 5( Evaluate Traffic Demandon Architecture)
• C.  Step 2(analyze Traffic Demand and Step 4 ( Define Network Topology)
• D.  The steps to befollowed depended on the requirement of the network extension.

Which of the following statements about Bit Error Rate (BER) is correct?

• A.  BER is the ratio of redundant bits to correct bits.
• B.  BER can be accurately measured in a short period of time , for any rate.
• C.  BER can be measured beforeafter the FEC decoding.
• D.  BER is measured at both the transmitted and receiving ends.

What is precision Time Protocol (PTP) designed for?

• A.  Packet-based timing distribution
• B.  Shortest path discovery
• C.  Synchronization of encryption entities
• D.  Precise time measurements

Which of the following is recommended to reduce the latency of a 30km long link?

• A.  DCM-free amplifiers
• B.  L1 encryption
• C.  Low-noise amplifiers
• D.  Soft-decision FEC