Online Access Free 4A0-255 Exam Questions

Refer to the exhibit that shows a demand matrix, a network topology with candidate links (in thick bluelinesand dashed lines), the definednetwork in thick blue lines and the demand routing (colored numbers in the figure). Every link is 80 km long. Which of the following requirements is supported by this network design with the displayed demand routing?

• A.Minimum cost design
• B.Resilience against two link faults
• C.1+1 protection
• D.Minimum latency

Suppose that for a given number of buffer credits and for an given average FC frame size, the maximum FC link length is 50 km.
If the average FC frame size is doubled, which of the following is correct?

• A.Throughput is doubled.
• B.The buffer credits need to be adjusted to achieve the maximum throughput.
• C.The throughput is halved.
• D.The Throughput is the same,.

Consider two EDFA amplifiers in cascade. Each EDFA has an average input signal power of 10 mW and an average noise power of 1 mW. What is the OSNR of the system at the receiver.

• A.5 bB
• B.10 dB
• C.20 dB
• D.7 dB

Consider the exhibit. Which of the following NE architectures is represented?

• A.C-F ROADM
• B.CDC-F ROADm
• C.(Classic) ROADM
• D.TOADm

Which of the following statement about guaranteed restriction (GR) in generalized Multiprotocol labelSwitching (GMPLS) is correct?

• A.GR use reestablished backup LSPs with resources reserved and configured.
• B.GR calculates a new backup LSP every time a failure occurs.
• C.GR does not required the signaling of the fault to trigger the restoration.
• D.GR can achieve 100% survivability for a single-failure scenario only.