Deck 7: Wan Transport Methods

Question 1

The figure above is an example of a(n)X.25 frame.

Answer 1

True

Question 2

An advantage of RADSL is that the line length can be greater in situations where not all of the bandwidth is used, so it can accommodate customers who are more that 5.5 kilometers from the telco.

Answer 2

True

Question 3

N-ISDN is the most commonly installed version of ISDN, and currently has a practical data transmission rate that is equal to a T-1.

Answer 3

True

Question 4

The figure above shows a(n)ISDN LAPD frame.

Question 5

Currently, ____ is the most commonly used form of DSL.

A)ADSL
B)RADSL
C)IDSL
D)HDSL

Question 6

SONET is proprietary, so point-to-point network equipment can get expensive.

Question 7

With this DSL version, the maximum distance can be about 4 miles, which is longer than the 3.4 mile maximum for other DSL versions.

A)ADSL
B)RADSL
C)SHDSL
D)IDSL

Question 8

SMDS is a connectionless transport system.

Question 9

The SONET interface is called a DQDB, and consists of two shared fiber-optic media.

Question 10

High-speed Fast Ethernet technologies are beginning to challenge SONET and frame relay for dominance in Ethernet-based metropolitan area networks.

Question 11

The BRI ISDN supports faster data rates than the PRI ISDN.

Question 12

X.25 networks are designed to release unused bandwidth when nodes are not communicating.

Question 13

In frame relay communications, the virtual connections are a physical connection.

Question 14

X.25 is connection-oriented.

Question 15

The advantage of a(n)smart card is that is can be equipped with a digital signature, access keys, password access, and PIN to control logon access and access to files and data.

Question 16

DSL comes in many versions and is gathering interest among network administrators because it can turn existing twisted-pair telephone wire into a high-speed WAN for communications up to 55 Mbps (downstream).

Question 17

LAPF is also referred to as the Q.921 protocol.

Question 18

X.25 includes the LAPD protocol.

Question 19

When you use a modem to access the Internet, you most likely use PPP.

Question 20

SONET travels in a(n)bus topology.

Question 21

Which is not true about X.25?

A)It is a high-seed WAN protocol.
B)It has the ability to connect older LANs to WANs.
C)It is reliable.
D)None of the above.

Question 22

A ____ identifies an individual virtual connection on a frame relay network.

A)FRAD
B)DLCI
C)LCI
D)FCS

Question 23

____ is not an example of packet switching.

A)SVC
B)PVC
C)Datagrams
D)None of the above.

Question 24

____ is an audio communications technique that is used over the Internet for audio communications.

A)PCM
B)ADPCM
C)SB-ADPCM
D)VoFR

Question 25

There is/are ____ demand channel(s)in BRI ISDN.

A)4
B)3
C)2
D)1

Question 26

Which is not a method of connecting BRI ISDN into the customer?

A)Equipping a computer with a TA that also contains a network terminal network terminator.
B)Connecting the ISDN line into an external TA that is equipped with a U interface into which you plug in the ISDN line.
C)Using a multiplexor or a PBX.
D)Bringing the ISDN line into a NTU.

Question 27

The ____ protocol, also called the gateway protocol, was defined to connect X.25 to other packet-switched networks.

A)X.3
B)X.75
C)X.28
D)X.121

Question 28

Which is not true about both X.25 and frame relay?

A)Both use packet switching over virtual circuits.
B)Both allow the virtual connections to be switched or permanent.
C)Both are designed to interface with modern networks that do their own error checking.
D)None of the above.

Question 29

The X.25 Packet Protocol layer is like the OSI ____ layer.

A)Data Link
B)Network
C)Physical
D)Communication

Question 30

Frame relay does not use a layer that corresponds to the OSI ____ layer.

A)Data Link
B)Network
C)Physical
D)None of the above.

Question 31

____-ISDN is a developing technology intended for compatibility with ATM and SONET.

A)I
B)N
C)B
D)Both A and B.

Question 32

The X.25 Link Access layer is not responsible for ____.

A)packet switching
B)data transfer
C)error checking and correction
D)frame composition

Question 33

Which is not a protocol that can be transported over frame relay?

A)IPX
B)PPP
C)SLIP
D)None of the above.

Question 34

____ is an older flow control technique that uses a Ctrl+S to pause transmission and a Ctrl+Q to restart transmission.

A)T1.617
B)Q.933
C)LMI
D)XON/XOFF

Question 35

Which is not true about frame relay?

A)It looks for bad frame check sequences.
B)It discards packets if it detects heavy network congestion.
C)It is often used with TCP/IP-based or sometimes with older IPX-based networks.
D)None of the above.

Question 36

Which is a method of connecting PRI ISDN into the customer?

A)Equipping a computer with a TA that also contains a network terminal network terminator.
B)Connecting the ISDN line into an external TA that is equipped with a U interface into which you plug in the ISDN line.
C)Using a multiplexor or a PBX.
D)Bringing the ISDN line into a NTU.

Question 37

On an X.25 network, the ____ protocol defines start and stop transmissions between the DTE and the DCE.

A)X.3
B)X.20
C)X.28
D)X.29

Question 38

The T in NTU stands for ____.

A)Termination
B)Type
C)Transfer
D)Terminal

Question 39

In the US, PRI consists of ____ 64-Kbps channels.

A)30
B)23
C)10
D)3

Question 40

Frame relay typically uses the ____ for signaling communications.

A)T1.617
B)Q.933
C)LMI
D)Both A and C.

Question 41

____ is intended as an alternative to networking technologies that use coaxial or fiber-optic cable.

A)SHDSL
B)SDSL
C)HDSL
D)VDSL

Question 42

Which is not true about IDSL?

A)It enables upstream and downstream communications of up to 144 Kbps.
B)It is compatible with existing ISDN terminal adapters.
C)Customers pay only for the amount of bandwidth they need.
D)None of the above.

Question 43

The essential communications contained in the Q.931 protocol are called information elements.

Question 44

____ cable is preferred for ISDN cabling.

A)Twisted-pair copper wire
B)Fiber-optic
C)Coaxial
D)All of the above.

Question 45

X.25 offers bandwidth up to 2.048 Mbps.

Question 46

____ is the least universally available.

A)X.25
B)ISDN
C)frame relay
D)SMDS

Question 47

When using the LMI protocol, the DLCI is always 0.

Question 48

One of the most promising ____ projects is the development of an interface to ATM.

A)ADSL
B)RADSL
C)IDSL
D)HDSL

Question 49

____ incorporates layered communications corresponding to the OSI model's Physical, Data Link, Network, and Transport layers.

A)X.25
B)SONET
C)ISDN
D)SMDS

Question 50

SMDS incorporates layers that correspond to the Network and Physical layers of the OSI model.

Question 51

Frame relay is a connection-oriented service.

Question 52

The S is DSL stands for ____.

A)support
B)subscriber
C)service
D)serial

Question 53

How many of SONET's layers correspond to layers in the OSI model?

A)1
B)2
C)3
D)4

Question 54

There can only be one X.25 virtual connection over one physical connection, or communications cable.

Question 55

SONET high speed communications use ____ cable.

A)twisted-pair copper wire
B)fiber-optic
C)coaxial
D)All of the above.

Question 56

The figure above shows SONET ____ switching.

A)bidirectional line
B)automatic protection
C)dual ring
D)unidirectional path

Question 57

____ is a cell-based data transmission technology capable of speeds up to 155 Mbps over T-carrier lines.

A)X.25
B)SONET
C)ISDN
D)SMDS

Question 58

____ is used to determine the fastest communications routes on telecommunications WANs.

A)PPP
B)SS7
C)SLIP
D)PPTP

Question 59

____ is used more commonly for remote communications because it has greater capabilities and incorporates stronger security.

A)PPP
B)SLIP
C)CSLIP
D)None of the above.

Question 60

ISDN uses a frame format at ISDN Layer 2 that is called ____.

A)LAPB
B)LAPD
C)LAPF
D)None of the above.

Question 61

List and describe the methods of placing digital signals on the network.

Question 62

PAP is used to both authenticate and encrypt passwords.

Question 63

The figure above is an example of a(n)____________________.

Question 64

What is a FRAD? What is it used for?

Question 65

List and briefly describe the methods used by an X.25 network to transmit data packets.

Question 66

All frame relay communications implement the ___________________________________ core protocol.

Question 67

____________________ is a technology that uses advanced modulation technologies on existing telecommunications networks for high-speed networking between a subscriber and a telco.

Question 68

List and define the types of virtual connections that exist within frame relay.

Question 69

The X.25 ____________________ layer governs physical and electrical connectivity to communications adapters and the communications cable.

Question 70

List and define the techniques used to accomplish voice transmissions over a network.

Question 71

SLIP has more overhead than PPP.

Question 72

The first P in PAP stands for ____________________.

Question 73

Each LAN that is connected to the Optical Ethernet backbone has the same priority and the same bandwidth.

Question 74

The figure above shows the ____________________ format.

Question 75

In X.25, each DTE is connected to a DCE through a(n)______________________________.

Question 76

Before transmitting data, ADSL checks the telephone line for noise and error conditions in a process called _________________________.

Question 77

What is the difference between circuit and packet mode when connecting to ISDN? When are they used?

Question 78

HDSL supports voice communications as well as ADSL and RADSL.

Question 79

What are three benefits of ISDN?

Question 80

Frame relay includes an option, called ____________________, to transmit voice signals over the network to reduce long-distance telephone costs between sites.