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| Question ID 18604 | Which three capabilities are provided by MLD snooping? (Choose three.)
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| Option A | dynamic port learning
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| Option B | IPv6 multicast router discovery
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| Option C | user-configured ports age out automatically
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| Option D | a 5-minute aging timer
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| Option E | flooding control packets to the egress VLAN
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| Option F | a 60-second aging timer
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| Correct Answer | A,B,D |
Explanation Explanation: Like IGMP snooping, MLD snooping performs multicast router discovery, with these characteristics: Ports configured by a user never age out. Dynamic port learning results from MLDv1 snooping queries and IPv6 PIMv2 packets. If there are multiple routers on the same Layer 2 interface, MLD snooping tracks a single multicast router on the port (the router that most recently sent a router control packet). Dynamic multicast router port aging is based on a default timer of 5 minutes; the multicast router is deleted from the router port list if no control packet is received on the port for 5 minutes. IPv6 multicast router discovery only takes place when MLD snooping is enabled on the switch. Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12- 2_55_se/configuration/guide/scg3750/swv6mld.pdf
| Question ID 18605 | Which two statements are true about an EPL? (Choose two.)
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| Option A | It is a point-to-point Ethernet connection between a pair of NNIs.
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| Option B | It allows for service multiplexing.
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| Option C | It has a high degree of transparency.
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| Option D | The EPL service is also referred to as E-line.
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| Correct Answer | C,D |
Explanation Explanation: Ethernet private line (EPL) and Ethernet virtual private line (EVPL) are carrier Ethernet data services defined by the Metro Ethernet Forum. EPL provides a point-to-point Ethernet virtual connection (EVC) between a pair of dedicated usernetwork interfaces (UNIs), with a high degree of transparency. EVPL provides a point-to-point or point-to-multipoint connection between a pair of UNIs. The services are categorized as an E-Line service type, with an expectation of low frame delay, frame delay variation and frame loss ratio. EPL is implemented using a point-to-point (EVC) with no Service Multiplexing at each UNI (physical interface), i.e., all service frames at the UNI are mapped to a single EVC (a.k.a. all-to-one bundling). Reference: http://en.wikipedia.org/wiki/Ethernet_Private_Line