(LATEST) MEF CECP EXAM QUESTIONS AND CORRECT
ANSWERS
Mechanisms for tracking connectivity and performance for links, services, etc.
within the CEN are provided by SOAM (Service Operations Administration &
Maintenance-ANSWER). Both the service provider and the subscriber gain
from SOAM.
What are the advantages of SOAM for the service provider? ANSWER SOAM
gives the service provider the means to track network and service connectivity
and identify the cause of connectivity issues.
In what ways does SOAM help the subscriber? ANSWER SOAM offers a
standardized approach for both the service provider and the service subscriber
to measure critical metrics like availability and delay that are specified in the
Service Level Agreement (SLA).
Which two elements make up SOAM? ANSWER Performance monitoring
(SOAM PM) and fault management (SOAM FM)
SOAM-PM Features - ANSWER 1. The amount of time needed to send a
service frame from an incoming UNI to an outgoing UNI is known as the Frame
Delay (FD).
2. The difference in delay between two Service Frames from the same CoS
instance is known as Inter-frame Delay Variation (IFDV).
3. The Frame Loss Ratio (FLR), which is a percentage representation of the
quantity of lost frames between the entrance and egress UNI
4. Availability: the proportion of time a service is available for use
SOAM PM calculations ANSWER Measured and calculated independently in
both directions (UNI A to UNI B and UNI B to UNI A) for E-LINE
There are N*(N-1) (ordered) UNI pairs in an E-LAN with N UNIs.
, There are two *R*L ordered UNI pairs between the roots and leaves, as well as
an extra R*(R-1) ordered pair between the roots, for ETREE: R root UNIs and
L leaf UNIs.
Ethernet Virtual Private Line, often known as E-Line, is a service that connects
two client Ethernet ports via a wide area network (WAN). It has a high degree
of transparency and all service frames at the UNI are mapped to a single EVC,
also known as all-to-one bundling.
-Service multiplexing, or many EVCs or Ethernet services per UNI, is possible
with EVPL in contrast to EPL.The degree of transparency is another distinction
between the EVPL and EPL; whilst the latter is very transparent and simply
filters stop frames, the former is necessary to peek or drop the majority of Layer
2 Control Protocols.
A multi-point service that connects a group of client endpoints and gives the
impression to the customer that a bridged Ethernet network connects the sites is
called an Ethernet Virtual Private LAN, or E-LAN (multi-point to multi-point).
Any-to-any communication between all client sites connected to the customer's
EVC is made possible via VPLS-EVP-LAN.EVPL and EVP-LAN service types
may share a port, and service multiplexing is permitted at the UNI. Throughout
the network, CE-VLAN IDs are kept up to date.
A multi-point service that connects one or more roots to a group of leaves while
blocking inter-leaf communication is known as an Ethernet Virtual Private Tree,
or E-Tree (point to multi-point).
Ethernet over SDH/SONET (Transport) - ANSWER Utilizing virtual
concatenation and LCAS (Link Capacity Adjustment Scheme) to generate a
suitable carrier bundle, the Generic Framing Procedure of SDH equipment, and
the management and recovery capabilities of SDH to offer high availability and
resilience to failures, point-to-point Ethernet links are transported over
SDH/SONET networks.
Transport of Ethernet over MPLS ANSWER Ethernet services are delivered
across IP/MPLS networks utilizing a variety of IP-related protocols. An outside
MPLS "tunnel" is used to transmit Ethernet lines as "pseudowires" over MPLS
label switched pathways (LSPs). This approach has lately seen substantial use in
routed networks and can support both point-to-point (VPWS) and multipoint
ANSWERS
Mechanisms for tracking connectivity and performance for links, services, etc.
within the CEN are provided by SOAM (Service Operations Administration &
Maintenance-ANSWER). Both the service provider and the subscriber gain
from SOAM.
What are the advantages of SOAM for the service provider? ANSWER SOAM
gives the service provider the means to track network and service connectivity
and identify the cause of connectivity issues.
In what ways does SOAM help the subscriber? ANSWER SOAM offers a
standardized approach for both the service provider and the service subscriber
to measure critical metrics like availability and delay that are specified in the
Service Level Agreement (SLA).
Which two elements make up SOAM? ANSWER Performance monitoring
(SOAM PM) and fault management (SOAM FM)
SOAM-PM Features - ANSWER 1. The amount of time needed to send a
service frame from an incoming UNI to an outgoing UNI is known as the Frame
Delay (FD).
2. The difference in delay between two Service Frames from the same CoS
instance is known as Inter-frame Delay Variation (IFDV).
3. The Frame Loss Ratio (FLR), which is a percentage representation of the
quantity of lost frames between the entrance and egress UNI
4. Availability: the proportion of time a service is available for use
SOAM PM calculations ANSWER Measured and calculated independently in
both directions (UNI A to UNI B and UNI B to UNI A) for E-LINE
There are N*(N-1) (ordered) UNI pairs in an E-LAN with N UNIs.
, There are two *R*L ordered UNI pairs between the roots and leaves, as well as
an extra R*(R-1) ordered pair between the roots, for ETREE: R root UNIs and
L leaf UNIs.
Ethernet Virtual Private Line, often known as E-Line, is a service that connects
two client Ethernet ports via a wide area network (WAN). It has a high degree
of transparency and all service frames at the UNI are mapped to a single EVC,
also known as all-to-one bundling.
-Service multiplexing, or many EVCs or Ethernet services per UNI, is possible
with EVPL in contrast to EPL.The degree of transparency is another distinction
between the EVPL and EPL; whilst the latter is very transparent and simply
filters stop frames, the former is necessary to peek or drop the majority of Layer
2 Control Protocols.
A multi-point service that connects a group of client endpoints and gives the
impression to the customer that a bridged Ethernet network connects the sites is
called an Ethernet Virtual Private LAN, or E-LAN (multi-point to multi-point).
Any-to-any communication between all client sites connected to the customer's
EVC is made possible via VPLS-EVP-LAN.EVPL and EVP-LAN service types
may share a port, and service multiplexing is permitted at the UNI. Throughout
the network, CE-VLAN IDs are kept up to date.
A multi-point service that connects one or more roots to a group of leaves while
blocking inter-leaf communication is known as an Ethernet Virtual Private Tree,
or E-Tree (point to multi-point).
Ethernet over SDH/SONET (Transport) - ANSWER Utilizing virtual
concatenation and LCAS (Link Capacity Adjustment Scheme) to generate a
suitable carrier bundle, the Generic Framing Procedure of SDH equipment, and
the management and recovery capabilities of SDH to offer high availability and
resilience to failures, point-to-point Ethernet links are transported over
SDH/SONET networks.
Transport of Ethernet over MPLS ANSWER Ethernet services are delivered
across IP/MPLS networks utilizing a variety of IP-related protocols. An outside
MPLS "tunnel" is used to transmit Ethernet lines as "pseudowires" over MPLS
label switched pathways (LSPs). This approach has lately seen substantial use in
routed networks and can support both point-to-point (VPWS) and multipoint
