Alcatel-Lucent 4A0-105 問題集

質問 1：
What must be enabled in order to prevent a loop within a LAG?
A. RSTP
B. LACP active
C. Dynamic-cost
D. Nothing, There are no loops in LAGs
正解：B

質問 2：
Which of the following needs to be considered when designing Ethernet networks with redundancy?
A. Requires a protocol to remove loops.
B. Processing the TTL takes extra time.
C. MAC learning rate is doubled.
D. FDB size is doubled.
正解：A

質問 3：
When deploying Active/Standby pseudowires,the CE does not require any special configuration
A. FALSE
B. TRUE
正解：A

質問 4：
RSTP blocks a spoke-sdp using a management VPLS. Is traffic affected on an ES using the same transport SDP?
A. No
B. Yes
正解：B

質問 5：
What is the default fdb size for a VPLS service?
A. 25
B. 250
C. 1
D. 100
正解：B

質問 6：
Click on the exhibit below.

Assume there are two VPLS services configured on the MDU. How could load-balancing be achieved when using Active/Standby pseudowires?
A. Each VPLS will need their own pair of spoke-SDP's configured. The spoke-sdp's that are to be active should be configured with the option "precedence primary".
B. This cannot be done.
C. Under the end-point configuration, enable load-balancing 2 and the MDU will load balance automatically.
D. Each VPLS will use the same pair of SDP's with the same endpoint configured with the option "load-balancing 2".
正解：A

質問 7：
Why should you configure send-flush-on failure on your PE routers when using active/standby pseudowires?
A. On failure, the PE sends an LDP flush-all-from-me message to all PE devices in the VPLS. This speeds convergence to the new topology.
B. It flushes the local FDB speeding recovery
C. It discards all packets in the queue and sends icmp-discad messages to the sender. The packets are re-transmitted resulting in no loss of data.
D. It is not important to use send-flush-on-failure as Active/Standby signalling automatically converges the FDB in all VPLS instances
正解：A

質問 8：
Which of the following statements about Spanning Tree Protocol is true?
A. For the switches that are non-root or designated switches, the port with the highest combined cost to the root is the root port.
B. The switch port that is the greatest distance from the LAN to the root is the designated port.
C. In the case where two switches have the same priority, the switch with the lowest MAC address becomes the root.
D. All of the above.
正解：C

質問 9：
Which of the following statements relating to VPLS is false?
A. The VPLS switches traffic based on MAC address associated to the appropriate SAP.
B. A VPLS on a single node requires a SDP.
C. A VPLS is a multipoint Layer 2 service.
D. A VPLS allows multiple customer sites to be connected in a single bridged domain.
E. With an IP/MPLS infrastructure, service providers can provide multiple VPLS services over a common IP/MPLS infrastructure.
正解：B