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MEF > 2. MEF Fundamental Components and Reference Models > Flashcards

2. MEF Fundamental Components and Reference Models Flashcards

0
Q

Interface between two Operator MEN/CEN networks

A

ENNI

External Network-Network Interface

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1
Q

What MEF specification extends the basic reference model to define MEF services across multiple networks, with each MEN (CEN) independently owned and operated?

A

MEF 26.1

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2
Q

Service provider responsibility

A

from UNI to UNI

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3
Q

Operator responsibility

A

ENNI to UNI

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4
Q

In the General Reference Model, the independent networks are called what?

A

Operator MENs or Operator CENs

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5
Q

Interface between two Operator MEN/CENs

A

ENNI

External Network-to-Network Interface

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6
Q

True or False: In the General Reference Model, the Carrier Ethernet service is unchanged from the subscriber’s perspective.

A

True

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7
Q

In the General Reference Model how many Carrier Ethernet service providers are responsible for the service as a whole?

A

Only one

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8
Q

In the General Reference Model, the Carrier Ethernet service is implemented with how many EVCs connecting two or more UNIs?

A

Exactly one EVC (per Carrier Ethernet service)

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9
Q

True or False: In the general reference model, the basic reference model is sufficient to define the service from the subscriber’s perspective.

A

True

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10
Q

True or False: The General Reference Model adds details of implementation that are only important to the service provider and subcontracting operators.

A

True

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11
Q

True or False: A UNI, in general, can support more than one EVC.

A

True

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12
Q

Association of multiple EVCs to a single UNI

A

Service Multiplexing

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13
Q

Service multiplexing is a property of what?

A

A UNI

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14
Q

Is service multiplexing a property of the Carrier Ethernet service or EVC?

A

No.

Service multiplexing is a property of a UNI.

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15
Q

Key benefit of service multiplexing

A

Allows services to share UNIs, saving ports (physical connections) on subscriber and service provider edge equipment.

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16
Q

Ethernet frames are assigned to EVCs at UNIs based on what?

A

VLAN ID

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17
Q

Can an Ethernet frame be assigned to more than one EVC?

A

No.

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18
Q

An Ethernet frame transmitted across the UNI toward the SP or an Ethernet frame transmitted across the UNI toward the subscriber

A

Service Frame

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19
Q

True or False: All service frames are either:

1) untagged or
2) include an IEEE 802.1Q customer tag in the Ethernet header.

A

True

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20
Q

Includes 12 bits representing one of 4094 values that are used to identify the VLAN to which the Ethernet frame belongs.

A

VLAN Identifier (VID)

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21
Q

Two values in the VLAN ID (VID) space reserved for other uses and not available to identify subscriber VLANs.

A

0 and FFF

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22
Q

Two highest level C-Tag field groupings

A
  1. TPID (always 8100)

2. TCI (composed of PCP, CFI, and VID)

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23
Q

Length of VID field in TCI section of C-Tag

A

12 bits

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24
Q

Length of PCP field in TCI section of C-Tag

A

3 bits

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25
Q

Length of TPID field in C-Tag

A

16 bits

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26
Q

Length of CFI field in TCI section of C-Tag

A

1 bit

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27
Q

In IEEE 802.1Q (1998), what are the 3 PCP bits called?

A

User Priority bits

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28
Q

What are IEEE 802.1Q (1998) User Priority bits called in IEEE 802.1Q (2005)?

A

PCP bits

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29
Q

Two other terms used for PCP or User Priority bits

A
  1. P-bits

2. 802.1p bits

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30
Q

5 fields of an untagged IEEE 802.1Q (2005) Ethernet frame

A
  1. Destination MAC
  2. Source MAC
  3. Type / Length
  4. Payload
  5. FCS
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31
Q

6 fields of an tagged IEEE 802.1Q (2005) Ethernet frame

A
  1. Destination MAC
  2. Source MAC
  3. C-Tag
  4. Type / Length
  5. Payload
  6. FCS
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32
Q

Value of the TPID field in a C-Tag in an IEEE 802.1Q (2005) Ethernet frame

A

8100

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33
Q

An Ethernet frame that is either untagged or includes a single C-Tag (VLAN tag with TPID = 8100)

A

IEEE 802.1Q-2005 Ethernet frame

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34
Q

A C-Tag (VLAN tag with TPID = 8100)

A

IEEE 802.1Q Customer Tag

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35
Q

IEEE 802.1Q Customer Tag

A

A C-Tag (VLAN tag with TPID = 8100)

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36
Q

Amendments included in IEEE 802.1Q-2011

A
  1. IEEE 802.1ad - Provider Bridging
  2. IEEE 802.1ah - Provider Backbone Bridging
  3. IEEE 802.1Qay - Provider Backbone Bridging with TE extensions
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37
Q

IEEE 802.1Qay

A

Provider Backbone Bridging with Traffic Engineering (TE) extensions

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38
Q

IEEE 802.1ad

A

Provider Bridging

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39
Q

IEEE 802.1ah

A

Provider Backbone Bridging

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40
Q

An untagged Ethernet frame has how many more bytes than its payload?

A

18 bytes more

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41
Q

Excluding payload, how many bytes are in an untagged Ethernet frame?

A

18

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42
Q

Number of bytes in a MAC address

A

6

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43
Q

Size of Type/Length field in an Ethernet frame

A

2 bytes

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44
Q

Size of FCS field in an Ethernet frame

A

4 bytes

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45
Q

Length of a Tagged Ethernet frame not including the payload

A

22 bytes

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46
Q

Size of the C-Tag field in a tagged Ethernet frame

A

4 bytes

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47
Q

Maximum payload for a standard 802.3 Ethernet frame

A

1500 bytes

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48
Q

Maximum length of a C-Tagged Ethernet frame

A

1522 bytes

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49
Q

Maximum length of an untagged Ethernet frame

A

1518 bytes

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50
Q

6 components of a Layer 2 Ethernet frame

A
  1. Destination MAC
  2. Source MAC
  3. C-Tag (if a Tagged frame)
  4. Type/Length
  5. Payload
  6. FCS
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51
Q

Two fields in a Layer 1 Ethernet frame which are not present in a Layer 2 Ethernet frame

A
  1. Interframe Gap

2. Preamble & Start

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52
Q

8 fields in a Layer 1 Ethernet frame

A
  1. Interframe Gap
  2. Preamble & Start
  3. Destination MAC
  4. Source MAC
  5. C-Tag (if a Tagged frame)
  6. Type / Length
  7. Payload
  8. FCS
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53
Q

Length of Interframe Gap in a Layer 1 Ethernet frame

A

12 bytes

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54
Q

Length of Preamble & Start in a Layer 1 Ethernet frame

A

8 bytes

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55
Q

True or False: Ethernet is both a Layer 1 technology and a Layer 2 technology.

A

True

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56
Q

How many more bytes are in a Layer 1 Ethernet frame compared to a Layer 2 Ethernet frame?

A

20 more bytes

(12 bytes of Interframe Gap and 8 bytes of Preamble & Start

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57
Q

Refers to the IEEE 802.1Q customer tag in the Ethernet header of a service frame

A

CE-VLAN tag

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58
Q

Two common terms for the CE-VLAN tag

A
  1. C-VLAN tag

2. C-Tag

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59
Q

Refers to the VLAN Identifier (VID) in the CE-VLAN tag

A

CE-VLAN ID

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60
Q

Number of usable values in the 12-bit VID

A

4094

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61
Q

VID reserved values

A

0 and FFF

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62
Q

How is the CE-VLAN tag used to assign a service frame to a service (an EVC)?

A
  1. The subscriber marks the service frame with a CE-VLAN ID before sending it across the UNI to the SP.
  2. When the service frame arrives at the UNI, the SP associates the service frame to an EVC based on the CE-VLAN ID.
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63
Q

Mapping of CE-VLAN IDs to EVCs (per UNI) requires what?

A

Coordination between the subscriber and the service provider

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64
Q

In a general sense, what term implies that multiple CE-VLAN IDs are assign to a single EVC?

A

Bundling

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65
Q

In MED service definitions, what term describes a UNI’s ability to support the assignment of multiple CE-VLAN IDs to an EVC?

A

Bundling

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66
Q

Association of multiple CE-VLAN IDs to an EVC at a UNI

A

Bundling

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67
Q

Association of all service frames to one EVC at the UNI

A

All-to-one Bundling

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68
Q

True or False: In MEF service definitions, bundling and all-to-one bundling are mutually exclusive.

A

True.

A UNI can support bundling or all-to-one bundling, but not both.

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69
Q

True or False: A UNI can support bundling or all-to-one bundling, but not both.

A

True.

Bundling and all-to-one bundling are mutually exclusive.

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70
Q

Associates multiple EVCs to a UNI

A

Service Multiplexing

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71
Q

Can bundling and service multiplexing co-exist on the same UNI?

A

Yes

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72
Q

Can a UNI support service multiplexing together with all-to-one bundling? Why or why not?

A

No.
All-to-one bundling implies that all service frames map to ONE EVC.
A service frame cannot map to more than one EVC.
Service multiplexing implies more than one EVC is associated with the UNI.

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73
Q

Three main Carrier Ethernet service types defined MEF 6.1

A
  1. E-Line
  2. E-LAN
  3. E-Tree
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74
Q

For each main service type (E-Line, E-LAN, and E-Tree), the MEF defines which two services?

A
  1. A port-based, or private, service.

2. A VLAN-based, or virtual private, service.

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75
Q

3 Port-Based (All-to-One Bundling) Carrier Ethernet Services

A
  1. EPL (Ethernet Private Line)
  2. EP-LAN (Ethernet Private LAN)
  3. EP-Tree (Ethernet Private Tree)
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76
Q

3 VLAN-Based (Ethernet frames mapped by VLAN ID) Carrier Ethernet Services

A
  1. EVPL (Ethernet Virtual Private Line)
  2. EVP-LAN (Ethernet Virtual Private LAN)
  3. EVP-Tree (Ethernet Virtual Private Tree)
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77
Q

Two types of E-Line (point-to-point EVC) Carrier Ethernet services

A
  1. EPL (Ethernet Private Line) [Port-Based (All-to-One Bundling)]
  2. EVPL (Ethernet Virtual Private Line) [VLAN-Based (Ethernet frames mapped by VLAN)]
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78
Q

Two types of E-LAN (multipoint-to-multipoint EVC) Carrier Ethernet services

A
  1. EP-LAN (Ethernet Private LAN) [Port-Based (All-to-One Bundling)]
  2. EVP-LAN (Ethernet Virtual Private LAN) [VLAN-Based (Ethernet frames mapped by VLAN ID)b
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79
Q

Two types of E-Tree (rooted-multipoint EVC) Carrier Ethernet services

A
  1. EP-Tree (Ethernet Private Tree) [Port-Based (All-to-One Bundling)]
  2. EVP-Tree (Ethernet Virtual Private Tree) [VLAN-Based (Ethernet frames mapped by VLAN ID)
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80
Q

True or False: In a port-based (or private) service, all UNIs are configured for all-to-one bundling, and all service frames are mapped to the EVC, regardless of CE-VLAN ID.

A

True

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81
Q

Port-based service is also referred to as what?

A

Private service

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82
Q

Private service is also referred to as what?

A

Port-Based Service

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83
Q

CE-VLAN IDs are explicitly mapped to the EVC at each UNI in what service?

A

VLAN-based (or virtual private) service.

84
Q

True or False: In a VLAN-based (or virtual private) service, CE-VLAN IDs are explicitly mapped to the EVC at each UNI.

A

True

85
Q

Key advantage of a port-based service

A

The subscriber and the service provider do not have to coordinate VLAN IDs.

86
Q

Key advantage of a VLAN-based service

A

VLAN-based services can share UNIs:

- saving ports (physical connections) on subscriber and service provider edge equipment.

87
Q

To permit sharing, a UNI must be configured to support what?

A

Service multiplexing

88
Q

EVCs that share a UNI must use different what?

A

Different CE-VLAN IDs

89
Q

With respect to VLAN-based service, classify each of the following UNI attributes as either mandatory, support, or not supported:

(1) Bundling
(2) All-to-one bundling
(3) Service Multiplexing

A

(1) Bundling: Supported
(2) All-to-one bundling: Not supported
(3) Service Multiplexing: Supported

90
Q

With respect to port-based service, classify each of the following UNI attributes as either mandatory, supported, or not supported:

(1) Bundling
(2) All-to-one Bundling
(3) Service multiplexing

A

(1) Bundling - Not Supported
(2) All-to-one Bundling - Mandatory
(3) Service multiplexing - Not Supported

91
Q

Service type determines what two things?

A

(1) EVC Topology

(2) UNI Connectivity

92
Q

Service type for creating a point-to-point service between two UNIs

A

E-Line Service Type

93
Q

Type of EVC in a E-Line service type

A

Point-to-Point EVC

94
Q

Service type for creating a multipoint-to-multipoint service that allows any UNI to forward Ethernet frames to any other UNI..

A

E-LAN Service Type

95
Q

Service type that supports bridging (forwards frames based on MAC address learning)

A

E-LAN Service Type

96
Q

E-LAN Service Type Example Applications

A
  1. Layer 2 Virtual Private Network (L2 VPN)
  2. Layer 3 Virtual Private Network (L3 VPN)
  3. Multicast Network
97
Q

Service type used for creating a rooted-multipoint service that prevents some UNIs from forwarding Ethernet frames to other UNIs.

A

E-Tree Service Type

98
Q

In an E-Tree Service Type, each UNI is declared to be what?

A

Either a ROOT or a LEAF

99
Q

Allowed to forward Ethernet frames to leaves and roots.

A

Roots

100
Q

Can only forward frames to a root.

A

Leaf

In an E-Tree Service, there is no leaf-to-leaf forwarding.

101
Q

In an E-Tree service type, there is no what?

A

Leaf-to-leaf forwarding

102
Q

Like the E-LAN service type, this service type supports bridging.

A

E-Tree Service Type

103
Q

What is the difference in forwarding between E-LAN and E-Tree service types?

A

Unlike the E-LAN service type, frame forwarding in the E-Tree service type is also subject to LEAF/ROOT constraints.

104
Q

Example applications that can utilize an E-Tree service type

A

Internet access
Broadcast network
Mobile backhaul
Residential broadband backhaul

105
Q

Example applications for E-Line service type

A
  1. Private Line
  2. Virtual Private Line
  3. Internet access
106
Q

A port-based service of type E-Line

A

Ethernet Private Line (EPL)

107
Q

Transports all service frames bidirectionally between two UNIs

A

Ethernet Private Line (EPL) service

108
Q

Most popular Carrier Ethernet service due to its simplicity

A

EPL Service

109
Q

Replacement for TDM private line service

A

EPL service

110
Q

Requires a dedicated physical connection (UNI) at each end

A

EPL service

111
Q

Requires no VLAN coordination between the subscriber and the service provider

A

EPL Service

112
Q

Provides a high degree of transparency, transporting all service frames and preserving the content of all service frames, including Layer 2 control plane (L2CP) frames.

A

EPL Service

113
Q

VLAN-based service of type E-Line

A

Ethernet Virtual Private Line (EVPL)

114
Q

A replacement for TDM private line service and for Frame Relay or ATM Layer 2 VPN services and also offers higher bandwidth capability.

A

Ethernet Virtual Private Line (EVPL) service

115
Q

Allows service multiplexing at UNIs (multiple services can be delivered over a single physical connection)

A

Ethernet Virtual Private Line (EVPL) service

116
Q

Requires VLAN coordination between the subscriber and the service provider

A

Ethernet Virtual Private Line (EVPL) service

117
Q

Provides LESS transparency compared to EPL service

A

Ethernet Virtual Private Line (EVPL) service

118
Q

Why does EVPL service provide less transparency compared to EPL service?

A

Because tunneling of certain L2CP service frames, such as Bridge Protocol Data Unit (BPDU) frames to support STP, is not supported.

119
Q

Process by which an L2CP service frame is passed through the service provider network without being processed and is delivered unchanged to the proper UNI(s).

A

Tunneling

120
Q

A port-based service of type E-LAN

A

Ethernet Private LAN

121
Q

Allows any UNI to forward Ethernet frames to any other UNI

A

Ethernet Private LAN (EP-LAN) Service

122
Q

Type of EVC in an EP-LAN service

A

Multipoint-to-Multipoint EVC

123
Q

How are frame forwarded in an EP-LAN service?

A

Ethernet frames are forwarded based on MAC address.

EVC must support MAC address learning.

124
Q

True or False: In an EP-LAN service, the EVC must support MAC address learning.

A

True

125
Q

Requires a dedicated physical connection (UNI) to support each EVC end point.

A

Ethernet Private LAN (EP-LAN) Service

126
Q

True or False: An EP-LAN service requires no VLAN coordination between the subscriber and the service provider.

A

True

127
Q

Does an EP-LAN service preserve CE-VLAN tags, including VLAN IDs and PCP bits?

A

Yes

128
Q

Does an EP-LAN service support tunneling of L2CP frames, including BPDU frames to support STP?

A

Yes

129
Q

True or False: EP-LAN service provides a high degree of transparency.

A

True

130
Q

Two reasons why an EP-LAN service provides a high degree of transparency

A
  1. Preserves CE-VLAN tags, including VLAN IDs and PCP bits.

2. Supports tunneling of L2CP frames, including BPDU frames to support STP.

131
Q

Process by which an L2CP service frame is passed through the service provider network without being process and is delivered unchanged to the proper UNIs.

A

Tunneling

132
Q

VLAN-based service of type E-LAN

A

Ethernet Virtual Private LAN (EVP-LAN)

133
Q

Can an EVP-LAN service share a UNI with an EVPL service?

A

Yes.

134
Q

How are Ethernet frames forwarded in an EVP-LAN service?

A

Forwarded based on MAC address.

EVC must support MAC address learning.

135
Q

True or False: EVP-LAN service allows service multiplexing at UNIs.

A

True

136
Q

True or False: EVP-LAN service provides less transparency compared to EP-LAN because of tunneling of certain L2CP service frames, such as BPDU frames to support STP, is not supported.

A

True

137
Q

Does EVP-LAN service requires VLAN coordination between the subscriber and the service provider?

A

Yes

138
Q

Port-based service of type E-tree

A

Ethernet Private Tree (EP-Tree) service

139
Q

True or False: An E-Tree service allows roots to forward Ethernet frames to roots or leaves, but leaves can only forward Ethernet frames to roots.

A

True

140
Q

Type of EVC used in an EP-Tree service

A

Rooted-Multipoint EVC

141
Q

How does an EP-Tree service enforce security?

A

By preventing interaction between leaves.

142
Q

How are Ethernet frames forwarded in an EP-Tree service?

A

Based on MAC address.

EVC must support MAC address learning.

143
Q

Does an EP-Tree service require VLAN coordination between the subscriber and the service provider?

A

No

144
Q

How does an EP-Tree service provide a high degree of transparency?

A
  1. By preserving CE-VLAN tags, including VLAN-IDs and PCP bits.
  2. By supporting tunneling of L2CP frames, including BPDU frames to support STP.
145
Q

VLAN-based service of type E-Tree

A

Ethernet Virtual Private Tree (EVP-Tree) service

146
Q

Allows roots to forward Ethernet frames to roots or leaves, but leaves can only forward Ethernet frames to roots.

A

An E-Tree service

147
Q

On what basis are frames forwarded in an EVP-Tree service?

A

Based on MAC address.

EVC must support MAC address learning.

148
Q

True or False: An EVP-Tree service allows service multiplexing at UNIs (multiple services can be delivered over a single physical connection).

A

True

149
Q

Does an EVP-Tree service require VLAN coordination between the subscriber and the service provider?

A

Yes

150
Q

Why does EVP-Tree service provide less transparency compared to EP-Tree service?

A

Because tunneling of certain L2CP service frames, such as BPDU frames to support STP, is not supported.

151
Q

Most popular Carrier Ethernet service due to its simplicity

A

EPL

152
Q

Replacements for TDM private line service

A
  1. EPL

2. EVPL

153
Q

Replacement for Frame Relay or ATM Layer 2 VPN services and offers higher bandwidth capability

A

EVPL

154
Q

Requires a dedicated physical connection (UNI) to support each EVC end point.

A
  1. EPL
  2. EP-LAN
  3. EP-Tree
155
Q

Allows service multiplexing at UNIs (multiple services can be delivered over a single physical connection)

A
  1. EVPL
  2. EVP-LAN
  3. EVP-Tree
156
Q

Requires VLAN coordination between the subscriber and service provider

A
  1. EVPL
  2. EVP-LAN
  3. EVP-Tree
157
Q

Provides a high degree of transparency

A
  1. EPL
  2. EP-LAN
  3. EP-Tree
158
Q

Support tunneling of BPDU frames to support STP

A
  1. EPL
  2. EP-LAN
  3. EP-Tree
159
Q

Prevents interaction between leaf UNIs

A
  1. EP-Tree

2. EVP-Tree

160
Q

Supports bridging (forwards Ethernet frames based on MAC address learning)

A
  1. EP-LAN
  2. EVP-LAN
  3. EP-Tree
  4. EVP-Tree
161
Q

What is bundling?

A

The association of multiple CE-VLAN IDs to an EVC at a UNI

162
Q

E-LAN

A

Multipoint-to-Multipoint EVC

163
Q

3 EVC Types and the associated services

A
  1. Point-to-Point: EPL, EVPL
  2. Multipoint-to-Multipoint: EP-LAN, EVP-LAN
  3. Rooted-Multipoint: EP-Tree, EVP-Tree
164
Q

What is service multiplexing?

A

Association of multiple EVCs to a UNI

165
Q

Association of all service frames to one EVC at the UNI

A

All-to-one bundling

166
Q

All-to-one bundling

A

Association of all service frames to one EVC at the UNI

167
Q

Port-based services

A
  1. EPL
  2. EP-LAN
  3. EP-Tree
168
Q

VLAN-based Services

A
  1. EVPL
  2. EVP-LAN
  3. EVP-Tree
169
Q

2 Key Advantages of Port-Based Services

A
  1. A subscriber can configure VLANs without any need to coordinate with the service provider.
  2. There is more service transparency compared to VLAN-based service.
170
Q

Key advantage of VLAN-based service

A

This service supports service multiplexing.

171
Q

EVP-Tree

A

Ethernet Virtual Private Tree

VLAN-based E-Tree service

172
Q

EP-Tree

A

Ethernet Private Tree

Port-Based E-Tree Service

173
Q

E-Tree

A

Rooted multipoint EVC

no traffic between leaves

174
Q

EVP-LAN

A

Ethernet Virtual Private LAN

VLAN-based E-LAN service

175
Q

EP-LAN

A

Ethernet Private LAN

Port-based E-LAN service

176
Q

E-LAN

A

Multipoint-to-Multipoint EVC

177
Q

EVPL

A

Ethernet Virtual Private Line

VLAN-based E-Line service

178
Q

EPL

A

Ethernet private line

port-based E-Line service

179
Q

E-Line

A

Point-to-Point EVC

180
Q

EVC

A

Ethernet Virtual Connection

181
Q

What is an Ethernet Virtual Connection (EVC)?

A

A logical representation of a service connection between two or more UNIs

182
Q

ENNI

A

External Network-to-Network interface

183
Q

What does an ENNI provide an interface between?

A

Between two MEN/CENs

184
Q

CE-VLAN ID

A

Customer-edge VLAN ID

185
Q

Synonymous with MEN

A

CEN

186
Q

Synonymous with CEN

A

MEN

187
Q

CE

A

Customer Edge (equipment)

188
Q

Service Frame

A
  1. An Ethernet frame transmitted across the UNI toward the SP
  2. An Ethernet frame transmitted across the UBI toward the subscriber
189
Q

Interface between an Operator MEN (Operator CEN) and the subscriber is called a (an):

  1. ENNI
  2. OVC
  3. UNI
  4. EVC
  5. CE
A
  1. UNI
190
Q

Service multiplexing allows:

  1. Multiple services on one EVC
  2. Multiple EVCs on one UNI
  3. Multiple UNIs on one EVC
  4. Bundling
  5. Multiple CE-VLAN IDs to be mapped to an EVC
A
  1. Multiple EVCs on one UNI
191
Q

MEF definition of a UNI

A

The physical demarcation point between the responsibility of the Service Provider and the responsibility of the Subscriber.

192
Q

Equipment on the subscriber side of the UNI that connects to the MEN (CEN)

A

Customer Edge

193
Q

Which two Carrier Ethernet service combinations can be offered simultaneously at a given UNI?

a. EP-LAN and EVPL
b. EVP-Tree and EPL
c. EVPL and EVP-LAN
d. EPL and EP-Tree

A

c. EVPL and EVP-LAN can be offered simultaneously at a given UNI.

194
Q

A UNI is configured to support all-to-one bundling. Which three statements are true?

a. Service multiplexing is not supported at the UNI.
b. Any number of EVCs can be bundled to this UNI.
c. Bundling is not supported at the UNI
d. At this UNI, all CE-VLAN IDs map to the same EVC.

A

a. Service multiplexing is not supported at the UNI.

c. Bundling is not supported at the UNI
d. At this UNI, all CE-VLAN IDs map to the same EVC.

195
Q

Which three service types are defined in MEF 6.1? (Choose 3)

a. Ethernet Virtual Connection (EVC)
b. Ethernet Line (E-Line)
c. Ethernet Tree (E-Tree)
d. Ethernet Access (E-Access)
e. Ethernet LAN (E-LAN)
f. TDM Line (T-Line)

A

b. Ethernet Line (E-Line)
c. Ethernet Tree (E-Tree)

e. Ethernet LAN (E-LAN)

196
Q

An enterprise needs to connect 3 branch offices with its 2 payroll processing data centers. The 2 DCs require interconnectivity for data mirroring (protection). The service must ensure that the branch offices cannot see each other’s sensitive payroll data. Which 2 of the following service arrangements supports this application? (Choose 2).

a. An EP-Tree service with the payroll data center UNIs designated as leaves and branch office UNIs designated as roots.
b. An EP-Tree service with payroll data center UNIs designated as roots and branch office UNI designated as leaves.
c. One EP-LAN service connecting all 5 sites.
d. One EVPL service from each branch office to each payroll data center (6 EVPLs in all), plus an EPL between the two payroll centers.

A

b. An EP-Tree service with payroll data center UNIs designated as roots and branch office UNI designated as leaves.
d. One EVPL service from each branch office to each payroll data center (6 EVPLs in all), plus an EPL between the two payroll centers.

197
Q

A UNI is configured without bundling or all-to-one bundling and is also configured to support service multiplexing. How many EVCs can terminate at this UNI?

a. 0
b. 0 to 1
c. Up to 64
d. Up to 4094

A

d. Up to 4094.
There are 4094 distinct CE-VLAN IDs.
Per IEEE 802.1Q-2005, the maximum number of VLANs that can be supported by the 12-bit field is 4094 rather than 4096 because VID values 0 and FFF are reserved.

198
Q
  1. Which kind of UNI-to-UNI connectivity is used for the Ethernet Private Line (EPL) service?
    a. Ethernet Private Circuit
    b. Point-to-Point Ethernet Private Connection
    c. Point-to-Point Ethernet Virtual Connection
    d. Point-to-Point Ethernet Virtual Circuit
A

c. Point-to-Point Ethernet Virtual Connection

199
Q

Does the MEF use the term “Ethernet Private Circuit”?

A

No

200
Q

Does the MEF use the term “Ethernet Private Connection”?

A

No

201
Q

Does the MEF use the term “Ethernet Virtual Circuit”?

A

No

202
Q

A customer 3 locations requests a Carrier Ethernet service that provides the most transparent connectivity for all PDU types between sites. Which service is most suitable?

a. A single Ethernet Private LAN (EP-LAN)
b. A single Ethernet Virtual Private LAN (EVP-LAN)
c. A single Ethernet Private Tree (EP-Tree)
d. A single Ethernet Virtual Private Tree (EVP-Tree)

A

a. A single Ethernet Private LAN (EP-LAN)

Answer b. works, but with less transparency.

203
Q

McBary’s, a business with numerous independently-owned restaurant franchises, wants to connect each franchise to the corporate data center to obtain daily sales information. Which of the following service arrangements is most suitable?

a. A single Ethernet Virtual Private LAN (EVP-LAN) service
b. One Ethernet Virtual Private Line (EVPL) service between each franchise and the corporate data center.
c. A single Ethernet Private Tree (EP-Tree) service with the corporate data center UNI designated as the root and franchise UNIs designated as leaves.
d. One Ethernet Private Line (EPL) service between each franchise and the corporate data center.

A

c. A single Ethernet Private Tree (EP-Tree) service with the corporate data center UNI designated as the root and franchise UNIs designated as leaves.

204
Q

Which two statements about a VLAN-based (virtual private) service are true? (Choose two.)

a. All UNIs must be configured to support service multiplexing.
b. All UNIs must be configured to support bundling.
c. All UNIs must be configured to support all-to-one bundling.
d. All UNIs may be configured to support service multiplexing.
e. All UNIs may be configured to support bundling.
f. All UNIs may be configured to support all-to-one bundling.

A

d. All UNIs may be configured to support service multiplexing.
e. All UNIs may be configured to support bundling.

205
Q

A UNI is configured without bundling or all-to-one bundling and is also configured to support service multiplexing. What is the maximum number of CE-VLAN IDs that can be mapped to a given EVC at the UNI?

a. 0
b. 1
c. 256
d. 4094
e. 4096

A

b. 1

Without bundling or all-to-one bundling, only 1 CE-VLAN ID can be mapped to an EVC.

206
Q

True or False: Without bundling or all-to-one bundling, only 1 CE-VLAN ID can be mapped to an EVC.

A

True

207
Q

Which Carrier Ethernet services support bridging (frame forwarding based on MAC address learning)? (Choose all answers that are correct.)

a. EPL
b. EVPL
c. EP-LAN
d. EVP-LAN
e. EP-Tree
f. EVP-Tree

A

c. EP-LAN
d. EVP-LAN
e. EP-Tree
f. EVP-Tree

MEF (4 decks)

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