Chapter 9

Front 1

Mesh networks:

Back 1

require more processing by each computer in the network than in star or ring networks

Front 2

WANs can connect BNs across distances that can span up to thousands of miles.

Back 2

True

Front 3

A _______ is a connectionless method of sending data packets on a packet switched service.

Back 3

datagram

Front 4

MPLS operate at layer 4.

Back 4

False

Front 5

SONET is made up of very high speed dedicated circuits that incorporate inverse multiplexing (IMUX) for all levels above the OC-1 level.

Back 5

True

Front 6

_____________ is a common standard for use by layer 2 access VPNs for encapsulation.

Back 6

L2TP

Front 7

In building Wide Area Networks, many organizations do not build their own long distance communication circuits

Back 7

True

Front 8

Which of the following type of networks permit packets from separate messages to be interleaved?

Back 8

packet switched network

Front 9

Full mesh networks are inexpensive.

Back 9

False

Front 10

A T1 circuit provides a data rate of 1.544Mbps.

Back 10

True

Front 11

Which of the following is not a way to reduce network demand?

Back 11

moving data further from the applications and people who use them

Front 12

The _________________ is a Canadian government agency that regulates voice and data communication.

Back 12

CRTC

Front 13

An intranet VPN connects different organizations over the Internet.

Back 13

False

Front 14

Frame relay is a reliable packet service.

Back 14

False

Front 15

In a ring design WAN,

Back 15

failure in one circuit means that the network can most likely continue to function

Front 16

The data rate for a T-1 circuit in North America is:

Back 16

1.544 Mbps

Front 17

_____________ is sometimes called a Layer 2.5 technology.

Back 17

MPLS

Front 18

A dedicated circuit is usually not available late at nights or on weekends.

Back 18

False

Front 19

A _______ geometric layout for a WAN connects all computers to one central computer that routes messages to the appropriate computer, usually via a series of point-to-point dedicated circuits.

Back 19

star design

Front 20

_____ are dedicated digital circuits that are the most commonly used form of dedicated circuit services in North America today.

Back 20

T-carrier services

Front 21

A ________ geometric layout connects all computers in a closed loop, with each computer linked to the next usually with a series of point-to-point dedicated circuits.

Back 21

ring design

Front 22

T carrier circuits can only be used to transmit voice.

Back 22

False

Front 23

With IP services, the ________ at the sending site takes the outgoing message (which usually is an Ethernet frame containing an IP packet), strips off the Ethernet frame and uses the IP address in the IP packet to route the packet though the carrier's packet?switched network to its final destination.

Back 23

PAD

Front 24

In North America, a T1 circuit has ______ 64Kbps channels.

Back 24

24

Front 25

Which of the following is not a basic architecture for dedicated circuit networks?

Back 25

bus

Front 26

Which of the following is a primary advantage of a VPN?

Back 26

low cost

Front 27

Primary rate interface:

Back 27

is typically offered only to commercial customers

Front 28

Basic rate interface:

Back 28

provides a communications circuit with two 64 Kbps B channels, plus one D channel

Front 29

Most IP services use _______ as the data link layer protocol.

Back 29

MPLS

Front 30

______________ are sometimes called private line services.

Back 30

Dedicated-circuit networks

Front 31

Dynamic routing:

Back 31

imposes an overhead cost by increasing network traffic

Front 32

Datagrams are connection-oriented.

Back 32

False

Front 33

Which of the following is not a type of VPN?

Back 33

T-1 VPN

Front 34

Virtual private networks permit users to create permanent virtual circuits, or tunnels, through the Internet.

Back 34

True

Front 35

Packet switched networks enable packets from separate messages or separate organizations to be interleaved for transmission.

Back 35

True

Front 36

With a virtual private network, users create permanent virtual circuits through the Internet called:

Back 36

tunnels

Front 37

__________ is a term that refers to the speed in converting input packets to output packets.

Back 37

Latency

Front 38

A _____________ is a user's connection into a packet switched service.

Back 38

packet assembly/disassembly device

Front 39

Ethernet/IP packet networks are not provided by common carriers such as AT&T.

Back 39

True

Front 40

The performance of WANs can be improved by:

Back 40

upgrading the circuits between the computers

Front 41

VPNs offer high security because they operate through the Internet.

Back 41

False

Front 42

An OC-1 circuit provides a data rate of 155 Mbps.

Back 42

False

Front 43

A _______________ is a particular type of network that uses circuits that run over the Internet but that appears to the user to be a private network.

Back 43

virtual private network

Front 44

The data rate for a T-3 circuit in North America is:

Back 44

44.376 Mbps

Front 45

A star topology is:

Back 45

dependent upon the capacity of the central computer for its performance

Front 46

Today, a common carrier that provides long distance services is typically called a local exchange carrier.

Back 46

False

Front 47

Ethernet/IP packet networks:

Back 47

are supported with gigabit fiber optic networks in large cities

Front 48

A star architecture:

Back 48

connects all computers to one central computer that routes messages to the appropriate computer

Front 49

A ___________ is/are devices that permit a user to connect to a digital T-carrier service.

Back 49

CSU/DSU

Front 50

In a packet switched network, permanent virtual circuits that look very similar to a _____________ (for hardware-based dedicated circuits) move packets through the network.

Back 50

cloud-based mesh design