CCNA Exam 642-311 – Cisco Optical SONET Exam

This is the Exam 642-311 with subjectCisco Optical SONET Exam. Download this exam sample to help your CCNA exam. The answer for each question already provided. You can download the file at the end of this post.

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

3 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

QUESTION 16:
How is UPSR and BLSR traffic rerouted during a protection switch when a complete fiber cable cut occurs?
A. Traffic is switched from the first node receiving the AIS indication.
B. Traffic is switched from the far side of the failure, allowing handshake to occur.
C. UPSR traffic is switched from the terminating node, BLSR traffic is rerouted from the originating node in the ring.
D. UPSR traffic is switched from the terminating node, circuit by circuit. BLSR traffic is rerouted from the last reachable node in the ring.

Answer: D

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