642-889 Exam Dumps | Select and Place: (Exhibit)

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Implementing Cisco Service Provider Next-Generation Edge Network Services
Cisco.642-889.v2018-06-25.q76
Question 54

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Question 54/76

Select and Place:

Correct Answer:

Explanation/Reference:
Explanation:
Point-Point --- E-Line
Multipoint 負o-Multipoint ?E-Lan
Rooted multipoint --- E-Tree
Business subscribers are an important segment of many service providers' customer base. The main business services that must be provided by the network today are:
* MPLS VPN
* Carrier Ethernet connectivity
* Managed services
Carrier Ethernet connectivity services have been defined by the Metro Ethernet Forum (MEF) to include E- Line, E-LAN, and E-Tree service types, which are defined as follows:
* E-Line is based on a point-to-point Ethernet Virtual Connection. Two E-Line services are defined:
- Ethernet Private Line (EPL): A very simple and basic point-to-point service characterized by low frame delay, frame delay variation, and frame loss ratio. No service multiplexing is allowed, and other than a committed information rate (CIR) no class of service (CoS) (Bandwidth Profiling) is allowed.
- Ethernet Virtual Private Line (EVPL): A point-to-point service wherein service multiplexing (more than one Ethernet Virtual Connection) is allowed. The individual Ethernet Virtual Circuits can be defined with a rich set of Bandwidth Profiles and Layer 2 Control Protocol Processing methods as defined by the Metro Ethernet Forum.
* E-LAN is based on a multipoint-to-multipoint Ethernet Virtual Connection. Service multiplexing (more than one Ethernet Virtual Circuit at the same UNI) is permitted, as is the rich set of performance assurances defined by the MEF such as CIR with an associated Committed Burst Size (CBS) and Excess Information Rate (EIR).
* E-Tree is a point-to-multipoint ELAN service in which the spoke "leaves" can communicate with the hub or "root" location but not with each other. Typical application for E-Tree is in franchise operations.

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