Deck 16: Wan Services

Question 1

All of the following are part of the LAPF core except:

A)frame delimiting
B)error correction
C)frame correction
D)congestion control

Answer 1

B

Question 2

The data contained within the Frame Relay address field is the _________.

A)MAC address
B)virtual circuit identifier
C)IP number
D)data link connection identifier

Answer 2

D

Question 3

The technique employed by Frame Relay is called __________.

A)inband signaling
B)outband signaling
C)common channel signaling
D)open shortest path first routing

Answer 3

C

Question 4

One of the reasons for ATMs high rate of speed is the fact that the protocol does no pre-connection setup and therefore there is no delay.

Question 5

X.25 uses out-of-band signaling.

Question 6

All Frame Relay nodes contain which of the following protocols?

A)LAPB
B)LAPD
C)LAPF Core
D)LAPF Control

Question 7

Carrier Ethernet often capitalizes on the existence of optical fiber and dense wavelength division multiplexing (DWDM) infrastructure to provide WAN and MAN services to subscribers.

Question 8

Frame Relay is a more streamlined communication process than X.25.

Question 9

Selecting a WAN protocol for a particular business is a fairly simple task given current pricing structures and business traffic patterns.

Question 10

Congestion recovery procedures are used to preserve the network during instances of high congestion when the network has begun to drop frames.

Question 11

ATM provides a flexible set of traffic control mechanisms that are based on the type of user data.

Question 12

Frames whose discard eligibility is set due to committed information rates are less likely to be removed from the network.

Question 13

MPLS is often described as being "protocol agnostic" because it can carry many different kinds of traffic.

Question 14

Because of the high speeds involved and the small amount of overhead,when compared to Frame Relay,congestion control in ATM networks is more complex.

Question 15

Due to the fixed cell size,the processing of ATM cells is faster than protocols employing a variable length cell.

Question 16

The cell loss priority within the ATM cell is similar to the DE bit in Frame Relay.

Question 17

Traffic leaving a network or internal telephone system is separated into different lines and then sent to the service provider.

Question 18

Congestion avoidance procedures are employed when congestion starts to build up and increasing queue lengths are detected.

Question 19

In Frame Relay systems congestion control is the responsibility of both end users and the network.

Question 20

The inability of frame relay to do hop by hop error control is offset by:

A)its gigabit speeds
B)its high overhead
C)the extensive use of in-band signaling
D)the increasing reliability of networks

Question 21

When using ATM,which of the following is NOT a characteristic of virtual channel connections?

A)quality of service can be specified
B)all connections are switched
C)sequencing is provided
D)traffic patterns can be monitored

Question 22

Congestion _________ procedures are used at the onset of congestion to minimize the effect on the network.

Question 23

The use of Carrier Ethernet technologies to create metropolitan area networks (MANs)is most commonly called _________.

Question 24

The _________ field indicates the type of information in the information field.

A)PT
B)VPI
C)GFC
D)CRC

Question 25

Systems using common channel signaling:

A)employ a separate virtual channel for connection setup
B)carry connection information within each frame
C)use an expanded control field
D)do not use channels

Question 26

Public switched services include which of the following?

A)ISDN
B)WAE
C)dial-up / modem
D)all of the above

Question 27

__________ services are deployed in several ways,including conventional Ethernet,Ethernet over SDH (Synchronous Digital Hierarchy),and Ethernet over MPLS.

Question 28

Most WAE implementations use __________to interconnect network endpoints.

Question 29

In ATM,the basic transmission unit is the ________.

A)frame
B)cell
C)packet
D)segment

Question 30

The ATM connections are identified by:

A)virtual paths within data link identifiers
B)virtual channels within virtual paths
C)virtual circuits within virtual paths
D)virtual circuits within data link identifiers

Question 31

Typically initiated when the network has begun to drop frames due to congestion,congestion _________ procedures are used to prevent network collapse in the face of severe congestion.

Question 32

When using ATM,which of the following is NOT one of the advantages for the use of virtual paths?

A)less work is needed to set a virtual path
B)the network architecture is simplified
C)the network performance and reliability is enhanced
D)channel connection setup times are reduced

Question 33

____________ directs data from one network node to the next based on short path labels rather than longer IP network addresses.

Question 34

Which of the following lists the items in order such that the associated channel capacities are increasing?

A)ATM,X.25,Frame Relay,and ISDN
B)ISDN,ATM,Frame Relay,and X.25
C)ATM,Frame Relay,ISDN,and X.25
D)X.25,ISDN,Frame Relay,and ATM

Question 35

WAE uses _________ connectivity to deliver high-speed WAN service.

Question 36

There are three major types of MPLS VPNs deployed in today's networks: Layer 2 (VPLS),Layer 3 (VPRN),and ___________.

Question 37

Which of the following are WAN protocols?

A)Frame Relay
B)T-1
C)SONET
D)all of the above

Question 38

Which of the following are LAN protocols?

A)X.25
B)ATM
C)Token Ring
D)all of the above

Question 39

__________ is the delivery of WAN services using Ethernet connectivity and is a high-speed alternative to traditional WAN services such as frame relay,leased lined,ATM,or T-1 services.

Question 40

Basically a VPN that simplifies linking Ethernet LANs at remote locations,_________ is marketed as an alternative to traditional WAN services such as T-1,leased lines,and frame relay.

Question 41

__________ indicates a request that a frame should be discarded instead of other frames in which this bit is not set,when it is necessary to discard frames.

Question 42

___________ notifies the user that congestion avoidance procedures should be initiated where applicable for traffic in the same direction as the received frame.

Question 43

A _________ is a bundle of virtual channels that have the same endpoints.

Question 44

_____________notifies the user that congestion avoidance procedures should be initiated where applicable for traffic in the opposite direction of the received frame.

Question 45

Logical connections in ATM are referred to as __________.