HCIA-Transmission V2.5 H31-311_V2.5 Training Material

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2. 1.FAS is the frame alignment overhead, the length is 6 bytes, located in the first row, column 1~6, the first~3 bytes are 3 OA1 bytes, and each OA1 is always "1111 0110", that is, 16 F6 in hexadecimal; the 4th to 6th bytes are 3 OA2 bytes, and each OA2 is always "0010 1000", that is, 28 in hexadecimal. A. correct b. error Answer: A 2. The LDG supports electrical layer scheduling at the ODU1 level. A. correct b. error Answer: B 3. The number of network elements (including REG) in the two-fiber bidirectional multiplex section sharing protection ring can exceed 16. A. correct b. error Answer: A 4. In Ethernet, the frame length has a lower limit, which is mainly due to which of the following considerations. A. Carrier sense B. Multi-point access C. Conflict detection D. Improve network bandwidth utilization Answer: C 5. When the PM segment of the ODUk generates seriously errored seconds, the network management will report the ODUk_PM_ES alarm. A. correct b. error Answer: B 6. If a network port that supports auto-negotiation is connected to a network port that does not support auto-negotiation, half-duplex to full-duplex may occur. A. correct b. error Answer: A 7. Which of the following options are in the low-loss area of single-mode fiber? (Multiple choice) A. 1310nm B. 900nm C.1550nm D.1200nm Answer: AC 2 / 5

3. 8. What are the following steps for low-speed services to be multiplexed into high-speed SDH services? (multiple choice) A. Mapping B. Overhead Insertion C. Positioning D. Multiplexing Answer: ACD 9. OSN 3500 branch line business has strong up and down capabilities, with 16 branch line outlet slots, 504 2M, 32 E4, 117 E3/DS3, 132 STM-1e, providing STM-1/4/ 16/64 group rate. A. correct b. error Answer: A 10. The levels of forced switching, fiber cut switching, manual switching, and practice switching are arranged from high to low. A. correct b. error Answer: A 11. Physical port: also known as MAC port, is the external port of the board. A. correct b. error Answer: A 12. Which of the following is not included in the basic architecture of MPLS L2VPN. A. AC B. VC C. Tunnel D. S-VLAN Answer: D 13. If a bit error is detected in the B1 byte, which of the following alarms will be reported by the peer end. A. MS-AIS B. RS-BBE C. RS-FEBBE D. Not reporting Answer: D 14. For the OSN6800 device, which of the following slots does not have an electrical layer crossover backplane bus? A. Slot1 B. SIot9 3 / 5

4. C. SIot10 D. SIot17 Answer: D 15. Complex traffic classification refers to classifying packets according to the ToS (Type of Service) field of IP packets, user priority or EXP field of MPLS packets to identify traffic with different priority characteristics. A. correct b. error Answer: B 16. The communication network can be divided into local area network and wide area network according to the geographical scope it covers, and a metropolitan area network between the local area network and the wide area network. The wide area network is characterized by low delay, high data rate and reliable transmission. A. correct b. error Answer: B 17. The advantages of WDM mainly include the following. (multiple choice) A. Large capacity, "transparent" transmission of data B. The system is easy to upgrade, and the existing investment can be protected to the greatest extent when upgrading C. Can fully replace SDH equipment D. Compatible with future all-optical switching networks E. High networking flexibility, economy and reliability Answer: ABDE 18. The dispersion coefficient is the delay difference caused by the optical wavelength signal passing through the unit length of optical fiber in the unit wavelength interval, so which of the following is the unit of the dispersion coefficient? () A. ps/nm B. ps/km C.ps/nm.km D.ps/km.nm Answer: C 19. When inserting LCK to the ODUk signal at the local end, what processing will the downstream station system not perform? A. Report ODUk_PM_LCK alarm B. Download ODUk_AIS information C. Return ODUk_PM_BDI D. Insert ODUk_PM_LCK alarm Answer: D 4 / 5

5. 20. Pointer adjustment is related to which of the following. A. The clock B. Speed C. Expenses D. Scrambling Answer: A 21. Which of the following statements about reuse is correct? In the process of byte interleaved multiplexing, the information payload and pointer bytes of each frame are interleaved and multiplexed according to the original value, and the segment overhead is also multiplexed accordingly. A. There will be 4 times the overhead in STM-1 in STM-4 B. The overhead in STM4 is newly integrated and has only one set of overhead C. The amount of overhead in STM-4 is the same as in STM-1 D. Overhead random generation in STM-4 Answer: B 22. The U2000 client supports installation on Windows, Solaris and SUSE Linux operating systems. A. correct b. error Answer: B 23. The optical monitoring channel is set up for the monitoring of the WDM optical transmission system. ITU-T recommends that the wavelength of 1510nm is preferred, and the capacity is 2MHz/s. A. correct b. error Answer: B 24. The half-duplex mode must have a collision detection and avoidance mechanism to avoid the situation where multiple devices seize the line at the same time. This mechanism is the so-called CSMA/CD, and the Chinese name is carrier sense multiple access/collision detection . A. correct b. error Answer: A 25. The current sparse wavelength division multiplexing system generally works in the band from 1271nm to 1611nm. Which of the following is the channel spacing? A. 10nm B. 5nm C. 20nm D. 18nm Answer: C 5 / 5