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Exam : Nortel 920-136
Title : NCDS - Ethernet Switching Solutions


1. Internet Group Management Protocol (IGMP) is used by IP Multicast routers to learn about the existence of host group members on their directly attached subnets. Which statement about IGMP is true?
A. The IP Multicast routers get this information by listening for IP hosts broadcasting IGMP queries and reporting their host group memberships.
B. The IP Multicast routers get this information by broadcasting IGMP queries and listening for IP hosts reporting their host group memberships.
C. The IP Multicast routers get this information by recognizing the modified MAC address of a Multicast packet and adding that MAC address to the Multicast tree.
D. The IP Multicast routers get this information by listening for Multicast Servers broadcasting IGMP queries and listening for IP hosts reporting their host group memberships.
Answer: B

2. A carrier needs to support OC-12c (STM-4) and OC-3c (STM-1) on an Ethernet Routing Switch 8600. What is a minimal configuration needed to support this requirement?
A. one ATM module and no MDAs
B. one OC-12c/STM-4 module and one OC-3c/STM-1 module
C. one OC-12c/STM-4 ATM MDA and one OC-3c/STM-1 ATM MDA on an ATM module
D. one OC-12c/STM-4 ATM MDA on the first ATM module and one OC-3c/STM-1 ATM MDA on the second ATM module
Answer: C

3. An engineer implemented a core network consisting of four Ethernet Routing Switch 8600s and needs the ability to build a redundant core. Which feature would be used to provide redundancy and fail-over times?
A. Spanning Forest
B. Multi-Link Trunking
C. Protocol Based VLANs
D. Split Multi-Link Trunking
Answer: D

4. A customer is expressing concern about reliability for their single uplink connection to the wiring closet. The switches in the wiring closet support Distributed Multi-Link Trunking (DMLT). What can be done so the Ethernet Routing Switch 8600 can eliminate a single point of failure for the lowest price?
A. Add a second switch fabric module.
B. Duplicate the trunk elements in software.
C. Duplicate the trunks across separate modules using DMLT.
D. Configure multiple Ethernet Routing Switch 8600s using Split Multi-Link Trunking (SMLT).
Answer: C

5. A customer is adding fiber support onto an existing 48 port 5510. Their current installation is using all UTP ports on the switch. They need to install two 1000 Base-SX SFPs into the SFP slots. Which statement is true about the requirements for this installation?
A. The Console port requires SFPs.
B. Only one 1000 Base-SX GBIC will be supported.
C. It will require ports 47 and 48 to be unplugged before using SFPs.
D. It will require the power to the unit is turned off before installing GBICs.
Answer: C

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