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Which statement about the Ethernet clock synchronization technology used in actual solutions is true?A. The IEEE1588 technology requires the intermediate node to support transparent clock transmission.
B. The NTP technology requires the intermediate node to support transparent clock transmission.
C. The CES packet recovery technology requires the intermediate node to support transparent clock transmission.
D. The 802.1as technology requires the intermediate node to support transparent clock transmission.
Answer: D
An IPTV bearer network requires the broadband TV (BTV), VOD, and near video on demand (NVOD) services. Video programs use the standard MPEG 4 codec format.Which of the following statements about the QoS policy are true?
A. To ensure the IPTV service quality on the user side, reserve 4 Mbit/s bandwidth for the IPTV service for each user and plan extra bandwidth for the broadband Internet service.
B. To ensure the IPTV service quality on the user side, reserve 2.5 Mbit/s bandwidth for the IPTV service for each user and plan extra bandwidth for the broadband Internet service.
C. Ensure that the BTV service has a higher priority than the VOD/NVOD service, and forward the downstream traffic and some protocol packets, such as the IGMP and PIM packets in priority.
D. Ensure that the VOD/NVOD service has a higher priority than the BTV service and guarantee QoS of both the upstream and downstream traffic.
Answer: B, C
Which command is used to query the aging time of the firewall session?
A. display firewall session table
B. display firewall session table verbose
C. display firewall packet-filter default all
D. display firewall server-map
Answer: B, D
When configure IPSec VPN, which kind of encryption algorithms is more excellent in security
A. AES
B. 3DES
C. SHA
D. MD5(128-bit)
Answer: A
Which functions does the bearer network NMS mainly provide?
A. Monitoring network traffic
B. Switchover time of a device’s active/standby system
C. Monitoring device load (CPU and Memory)
D. Packet loss delay
Answer: A, C, D
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