Deck 15: Wan Technology and Protocol

Question 1

In most networks,not every sender / receiver pair can be connected.

Answer 1

False

Question 2

Data communications via circuit switching involves three phases:

A)connect,transfer,hang-up
B)ring,talk,hang-up
C)dial,transfer,disconnect
D)establishment,data transfer,disconnect

Answer 2

D

Question 3

Use of digital transmission for applications such as telephone requires that a dedicated connection be established across the network.

Answer 3

True

Question 4

Presence information is associated with every presentity in the system and is maintained by the presence service.

Question 5

Almost all wide area networks use circuit switching.

Question 6

In a circuit switching network,the path that will be used through the network is determined prior to any data transfer.

Question 7

Which of the following is NOT a reason for network jitter when using packet switching networks?

A)packets may vary in length
B)packets may take different paths through the network
C)packets may encounter network congestion
D)data rates will vary from one trunk line to the next

Question 8

For communications outside the range of a single building or a cluster of buildings,a wide area network (WAN)is employed.

Question 9

Having multiple paths from one station to another through a network contributes to reliability.

Question 10

The major application that uses circuit switching networks is the telephone system,thus most data transferred using this type of network is voice traffic.

Question 11

Basic packet switching technology has recently been developed to replace circuit switching.

Question 12

Switching nodes are devices that enable data to be moved from senders to receivers.

Question 13

It is desirable to have only one path from sender to receiver to avoid excess costs.

Question 14

Which of the following is NOT one of classes of function for control signaling?

A)establishment
B)supervisory
C)call information
D)network management

Question 15

A public telecommunications network can be described using four generic components:

A)senders,receivers,lines,and nodes
B)subscribers,local loops,exchanges,and trunks
C)subscribers,trunks,nodes,and loops
D)local loops,subscriber lines,exchanges,and trunks

Question 16

The choice between circuit and packet switching depends on a host of considerations,including cost,performance,reliability, and flexibility.

Question 17

Interconnection of computer systems is not reliable when using circuit switched networks.

Question 18

In circuit switching networks,channel capacity between each pair of stations and / or nodes along the connection path must be reserved regardless if used or not.

Question 19

The public telephone network is a good example of a circuit switched network.

Question 20

Which of the following is NOT one of the stated advantages of packet switching over circuit switching?

A)there is less network delay
B)data rate conversion can be provided
C)priorities can be used
D)connections are never rejected

Question 21

_________ signals are used for the maintenance,troubleshooting,and overall operation of the network.

Question 22

Which of the following is a disadvantage of circuit switching?

A)delay
B)complex routing and control
C)requires subscriber compatibility
D)all of the above

Question 23

_______ are the devices that attach to the network.

A)Subscribers
B)Subscriber line
C)Exchanges
D)Trunks

Question 24

________ are the branches between exchanges.

A)Subscribers
B)Subscriber line
C)Exchanges
D)Trunks

Question 25

________ are the switching centers in the network.

A)Subscribers
B)Subscriber line
C)Exchanges
D)Trunks

Question 26

In the _________ approach,each packet is treated independently,with no reference to packets that have gone before.

Question 27

________ signals identify a subscriber.

Question 28

Two different technologies are used in wide area switched networks: circuit switching and _________ switching.

Question 29

Another well-known application of circuit switching is the _________ used to interconnect telephones within a building or office.

Question 30

Which of the following is an advantage of circuit switching?

A)provides speed conversion
B)compatible with voice
C)appears nonblocking
D)logical multiplexing

Question 31

________ are the means by which the network is managed and by which calls are established,maintained,and terminated.

Question 32

The ________ is the link between the subscriber and the network,also referred to as the subscriber loop or local loop.

A)subscribers
B)subscriber line
C)exchanges
D)trunks

Question 33

In a __________ network ,data entering the network from a station are routed to the destination by being switched from node to node.
A)packet switching

A)switched communication
B)simple switching
D)all of the above

Question 34

Communication via circuit switching involves three phases: circuit establishment,________,and circuit disconnect.

Question 35

Which of the following is a feature of Wide Area Networks?

A)strategic control
B)reliability
C)security
D)all of the above

Question 36

An advantage of packet switching over circuit switching is:

A)line efficiency is better
B)priorities can be used
C)can carry out data-rate conversion
D)all of the above

Question 37

The term ________ refers to those signals that provide information to the subscriber about the status of a call.

Question 38

The heart of the call placement process for VoIP is the ___________,defined in RFC 3261,which is an application-level control protocol for setting up, modifying,and terminating real-time sessions between participants over an IP data network.

A)SIP
B)SDP
C)PDP
D)POP

Question 39

A public telecommunications network can be described using four generic architectural components: subscribers,subscriber line,exchanges,and _________.

Question 40

Each station attaches to a node,and the collection of nodes is referred to as a ________ network

Question 41

__________ allows users to plan for network expansion and modifications arising as their needs change.

Question 42

Typically,the network provider owns a set of packet-switching nodes and links these together with leased lines provided by a carrier such as AT&T.Such a network is called a ________ ,reflecting the fact that the network adds value to the underlying transmission facilities.

Question 43

In the _________ approach,a preplanned route is established before any packets are sent.

Question 44

With ________,the calling user (program or individual)supplies the phone number of a URI (Universal Resource Indicator,a form of URL),which then triggers a set of protocol interactions resulting in the placement of the call.

Question 45

_________ involves the process of designing and implementing the network to meet the organization's unique requirements.