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WAN technologies > ATM Virtual Circuit and Path > Flashcards

ATM Virtual Circuit and Path Flashcards

1
Q

What mode does an ATM network operate in?

A

Connection Oriented Mode

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2
Q

What is a PVC?

A

Permanent virtual circuit (provisioned by the network operator)

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3
Q

What is an SVC?

A

Switched virtual circuit (dynamically established using a signaling protocol)

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4
Q

What has to happen before data exchange can occur?

A

Pre-defined PVCs or dynamically established SVCs need to be established.

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5
Q

At what OSI Layer does ATM occur?

A

Layer 2: Data Link

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6
Q

What happens at the Data Link layer with ATM?

A

ATM uses logical paths and channels at this layer. The basic ATM protocol, in a 5-octet header of the cell, is also at this layer.

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7
Q

How is a particular physical port on the ATM switch identified? How is this similar to Frame Relay?

A

Two logical identifiers are used. These are equivalent to Frame Relay DLCI, which defines an end-to-end virtual circuit.

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8
Q

What is DLCI?

A

Data Link Connection Identifier.

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9
Q

What is VPI?

A

Virtual Path Identifier

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10
Q

What is VCI?

A

Virtual Channel Identifier

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11
Q

How is a VPI logical path identifier similar to X.25 logical channel over a physical circuit or DLCI on a Frame Relay access circuit?

A

It allows multiplexing of “logical” VPIs over one physical link.

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12
Q

How is a logical identifier defined?

A

A logical channel identifier VCI must be added to complete the full ATM logical assignment, which allows multiplexing of VCIs within a VPI.

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13
Q

T/F: every VPI in a single physical link can be multiplexed.

A

True.

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14
Q

What does the combination of VPI and VCI identify?

A

The VCC or Virtual Channel Connection.

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15
Q

What is VCC?

A

Virtual Channel Connection

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16
Q

Virtual circuits may be permanent (provisioned by network operator) or ________ (__________).

A

Switched (dynamically established).

17
Q

What are PVCs and what do they do?

A

Permanent Virtual Circuits; provide connectivity and provide dedicated connections in the network

18
Q

What are SVCs and what do they do?

A

Switched Virtual Circuits; provide dynamic establishment of logical connections across ATM network

19
Q

How does customer equipment use VCIs?

A

Uses them to identify the virtual circuit over which data is to be transmitted

20
Q

How does having a VPI field increase performance?

A

The network uses the VPI field to bundle VCIs together between source and destination, which decreases switching time (less to examine)

21
Q

T/F: VCIs have local significance only while VPIs have significance across a wider network.

A

F. Both have local significance only.

22
Q

T/F: VPI and VCI values can change even for the same cell.

A

True. The ATM switch has to track these.

23
Q

What are Tx and Rx

A

Transmit side and Receiver side

24
Q

What is an NMS?

A

Network Management System

25
Q

T/F: VPI/VCIs are unidirectional: however, a full duplex PVC/SVC can be constructed using two pairs of each.

A

True

26
Q

What identifies a VCC?`

A

Virtual Channel Connection is identified by the combination of VPI/VCI

27
Q

Who uses VCIs and for what?

A

Customer equipment uses VCIs to identify the virtual circuit over which data is transmitted

28
Q

Who uses the VPI and for what?

A

Used by the network to bundle VCIs together between same source and destination

29
Q

T/F: VCIs/VPIs have local significance only.

A

True

30
Q

T/F: a pair of “user” VPI/VCIs is unidirectional.

A

True

31
Q

How do a pair of user VPI/VCIs have to be defined?

A

On a per-port basis

32
Q

What typically configures UE and network nodes?

A

centralized control and management system

33
Q

VPI is to what on the ATM airport? (VPI = 23)

A

Flight number on specific airline (AC 1290). Local significance!
Airlines deal with flights, not individual cells/passengers

34
Q

VCI is to what on the ATM airport? (VCI=305)

A

Seat assignment on a specific flight (22A). Local significance! However, VCIs actually apply to a stream of cells, rather than an individual cell.

35
Q

VCC is to what on the ATM airport?

A

All of the flight and seat numbers that get you to your destination

36
Q

A VPI is a bundle of ___ all going the same direction.

A

VCIs

37
Q

T/F: All VCIs in the same VPI get the same grade of service.

A

True

38
Q

ATM switch is to what in the ATM airport?

A

Airport terminal

WAN technologies (5 decks)

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