EVPL & EPL Questions
Question 1
Which two statements are true about an EVPL? (Choose two)
A. It has a high degree of transparency.
B. It does not allow for service multiplexing.
C. The EVPL service is also referred to as E-line.
D. It is a point-to-point Ethernet connection between a pair of UNIs.
Answer: C D
Question 2
Which mechanism does Cisco recommend for CE router interfaces that face the service provider for an EVPL circuit with multiple EVCs and multiple traffic classes?
A. HCBWFQ
B. LLQ
C. tail drop
D. WRED
Answer: A
Question 3
Which Carrier Ethernet service supports the multiplexing of multiple point-to-point EVCs across as a single UNI?
A. EPL
B. EVPL
C. EMS
D. ERMS
Answer: B
Question 4
Which two statements are true about an EPL? (Choose two)
A. It is a point-to-point Ethernet connection between a pair of NNIs.
B. It allows for service multiplexing.
C. It has a high degree of transparency.
D. The EPL service is also referred to as E-line.
Answer: C D
Question 1 and 4? Same questions, but different answers… Anyone know the real answer?
please see the description of EPL and EVPL below
http://en.wikipedia.org/wiki/Ethernet_Private_Line
Yes, I saw that. Answers for Question 1 should be A, C, D then.
Question 1 is : C,D
Not B and Not A
” Unlike EPL, EVPL allows for service multiplexing, i.e., multiple EVCs or Ethernet services per UNI. The other difference between the EVPL and EPL is the degree of transparency – while EPL is highly transparent”
MEF 6 defines two examples of E-Line services:
• Ethernet private line (EPL)—Uses a point-to-point EVC between two UNIs to provide a high degree
of transparency such that service frames, headers, and most Layer 2 protocols are identical at both
the source and destination UNI. It does not allow for service multiplexing; that is, a dedicated UNI
(physical interface) is used for the EPL.
• Ethernet virtual private line (EVPL)—Uses a point-to-point EVC between two UNIs, but does not
provide full transparency as with the EPL; that is, all Layer 2 control protocols are discarded at the
UNI. The EVPL also allows for service multiplexing, which means that more than one EVC can be
supported at the UNI, which cannot happen for the EPL
•Ethernet relay service (ERS or EVPL)—Point-to-point VLAN-based E-Line service that is used primarily for
establishing a point-to-point connection between customer routers.
•Ethernet wire service (EWS or EPL)—Point-to-point port-based E-Line service that is used primarily to
connect geographically remote LANs over an SP network.
Regards!!
Question should be A and D. EVPL is not also known as E-line. Read wannabe’s note above and and also refer to MEF documents.
Question 1 is A and D.
I stand corrected. Question 1 could be A C D. Reference: www.mef-net./Assets/Technical_Specifications/PDF/MEF_6.1.pdf.
Table 2 Ethernet Services
E-line (point-to-point service)
EPL (port-based, All-to-one bundling)
EVPL (VLAN-based, EVC identified by VLAN ID)
Question 1: stay with C and D. Wannabe is correct in that EVPL does not provide full transparency.
Both EPL and EVPL are E-Line services as defined by MEF. EPL is a port based service where one service is delivered over one port. The EVPL service is also an E-Line service as defined by MEF but is delivered via a VLAN such that you can have multiple services delivered over multiple VLANs on a single port (think trunk port in switching). Be careful with the service-multiplexing part in the ansewr section. These questions are deliberately misleading. The EPL DOES NOT support service muxing whereas the EVPL does. If anyone has the chance, the MEF CECP cert is a wonderful cert that covers carrier ethernet in great detail while remaining vendor agnostic.