CCNA Exam 642-311 – Cisco Optical SONET Exam

Exam : 642-311
Title : Cisco Optical SONET Exam
Ver : 02.14.07

2 Example Questions out of 60 Questions:

QUESTION 13:
Scrambling of SONET signals is done to _____.
A. prevent the leakage of external fiber emissions
B. provide the optical network with the highest level of security possible
C. assure an even distribution of 1′s and 0′s for extended transmitter life
D. assure an adequate number of transitions for clock recovery at the receiver
E. prevent the receiver from assuming AIS inadvertently when all 0′s are received

Answer: D

QUESTION 14:
SONET Code Violations (CV’s) totals in the PM tables are actually an accumulation of the number of _____.
A. JO errors detected in a specified interval
B. error detected in a given Errored Second (ES)
C. errors detected in a given Severely Errored second (SES)
D. errors the encryption algorithm detects in a specified interval
E. Bit interleaved Parity (BIP) errors detected in a specified interval

Answer: E

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