Chapter 1

Intranets

LAN that uses the same technologies as the internet.( open to ONLY those inside the organization)

Backbone Network(BN)

Larger central network connecting several LANS and other BNs , MANS and WANS.

client

User device to access network and receive data from a server

Local Area Networks(LANs)

-Covers a small , clearly defined area - can be contained in a single floor or work area or single building - LANs use wirelress circuits they are called WIRELESS LOCAL AREA NETWORKS (WLAN)

Wide area Networks

-Largest Geographic scope -often composed of leased circuits -spans 100 or 1000 of miles.

Backbone Network(Bns)

-high speed networks connecting other networks together -may span 100 of feet to several miles.

Which of the following is a term used to group together the physical and data link layers? 1.Internetwork layers 2.Hardware layers 3.Software layers 4.Middleware layers 5.Application Layers

2. Hardware layers

Which layer of the OSI model is responsible for ensuring that all packets sent are received by the destination station by dealing with end-to-end issues? 1.presentation 2.transport 3.physical 4.session 5.application

2.Transport

Due to advances in high speed communication networks, the information lag, or the time it takes for information to be disseminated around the world, has been significantly lengthened.

False

A local area network is: 1.a large central network that connects other networks in a distance spanning exactly 5 miles. 2.a group of personal computers or terminals located in the same general area and connected by a common cable (communication circuit) so they can exchange information such as a set of rooms, a single building, or a set of well-connected buildings. 3.a network spanning a geographical area that usually encompasses a city or county area (3 to 30 miles). 4.a network spanning a large geographical area (up to 1000s of miles). 5.a network spanning exactly 10 miles with common carrier circuits.

2.a group of personal computers or terminals located in the same general area and connected by a common cable (communication circuit) so they can exchange information.

The primary reason for networking standards is to: 1.simplify cost accounting for networks 2.ensure that hardware and software produced by different vendors can work together 3.make it more difficult to develop hardware and software that link different networks 4.ensure that all network components of a particular network can be provided by only one vendor 5.lock customers into buying network components from one vendor

2.ensure that hardware and software produced by different

In the Internet model, the application layer corresponds to the ________ layer(s) of the OSI model. 1.data link and network 2.session, presentation and application 3.application layer 4.application and presentation 5.network, transport and presentation

2.session, presentation and application

The _________ layer performs error checking which is redundant to some extent with the function of the _________ layer. 1.application, presentation 2.physical, data link 3.transport, data link 4.presentation, transport 5.network, physical

3. Network Layer

A(n) _________ is a LAN that uses the same technologies as the Internet but is provided to invited users outside the organization who access it over the Internet. 1.WAN 2.BN 3.extranet 4.intranet 5.MAN

3.Extranet

Data communications and networking can be considered as a global area of study because: 1.new technologies and applications emerge from a variety of countries and spread around the world 2.the technologies enable global communication 3.the political and regulatory issues are exactly the same in every country 4.a and b 5.none of the above

4 a and b

Which department of Next Day Air Service Inc (the case study, Chapter 1) has no automation whatsoever? 1. Sales and Marketing 2. Accounts Payable 3. Accounts Receivable 4. Fleet Maintenance Division 5. Information Services

4. Fleet Maintenance Division

A(n) _________ is a LAN that uses the same technologies as the Internet but is open to only those inside the organization. 1.WAN 2.BN 3.extranet 4.intranet 5.MAN

4.Intranet

Which of the following is not a property of a WAN: 1.connects backbone networks and MANS. 2.spans hundreds or thousands of miles 3.provides data transmission speeds from 56Kbps to 10Gbps. 4.connects a group of computers in a small geographic area such as room, floor, building or campus. 5.uses leased lines from IXCs (inter-exchange carriers) like ATT, MCI (Verizon), and Sprint.

4.connects a group of computers in a small geographic area such as room, floor, building or campus.

server:

Device that stores and transmits data to a client

A local area network (LAN) connects other LANs and backbone networks (BNs) located in different areas to each other and to wide area networks in a span from 3 to 30 miles.

False

Physical Layer

Layer 1: Concerned with transmitting data bits over a communication circuit.

Data Link Layer

Layer 2:

Data Communications:

Movement of computer information to one point to other.

Telecommunications

Transmission of voice and video(images and graphics)

Open Systems Interconnection (OSI) model

a seven-layer architecture for defining how data is transmitted from computer to computer in a network, from the physical connection to the network to the applications that users run. It also standardizes interactions between network computers exchanging information.

Extranets

private intranets extended to authorized users outside the organization

Circuit

connections between client and server

Wide area networks ( WANS)

connects BNS and MANS

Ethernet is an example of a network layer protocol.

false

The OSI model is currently the most widely implemented network model used to develop and build networks of any size, including the Internet itself.

false

The application layer is the seventh layer of the Internet model and specifies the type of connection and the electrical signals that pass through it.

false

Local Area Network(LAN)

is a group of computers located in he same general area.

A car manufacturer may give access to certain portions of its network to some of its suppliers via the Internet. This is an example of an extranet.

true

At the transport layer in the Internet model, TCP is responsible for breaking large files received from the application layer into smaller messages and opening a connection to a server for transferring them.

true

Data communication standards enable each layer in the sending computer to communicate with its corresponding layer in the receiving computer.

true