Business Data Communications
A local area network is:
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.
Another term for the weakening of a signal over distance is:
attenuation
Errors on a network can occur:
because of noise on the line
There are optional and required parts of an HTTP request. They are:
line, header, body
The two sublayers of the data link layer consist of the media access control sublayer and the________ .
logical link control
With respect to converting digital data into analog signals, AM stands for:
Amplitude modulation
Which of the following is not a controlled access method of media access control?
CSMA/CD
An application architecture is the way in which the functions of the application layer are performed solely by the clients in the network.
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
A(n) _________ is a network that uses the same technologies as the Internet but is open to only those inside the organization.
Intranet
As part of the five-layer network model used in this textbook, the data link layer sits directly between:
The Physical and Network layers
TCP includes a sequence number so that the packets can be reassembled at the destination in the correct order.
True
The four general functions of any application program are: data storage, data access logic, application logic and presentation logic.
True
The network layer performs the same functions in both the OSI and Internet models and is responsible for routing messages from the source computer to the destination computer.
True
The simplest method for error correction is retransmission.
True
Fiber optic cable can only be used on LANs.
False
In simplex transmission, the data flows in both directions at the same time
False
Part of the function of address resolution is translating the application layer address of the destination into a network layer address.
False
TCP is the network layer protocol used on the Internet today.
False
The latest version of IP is IPv7, which increases the address space from 128 bits to 256 bits.
False
To use the Web, each client computer requires a data link layer software package called a Web browser.
False
With contention, a computer does not have to wait before it can transmit. A computer can transmit at anytime.
False
With modem communications, the receiving modem converts the incoming digital signal from the telephone line into an analog signal that can be understood by the computer.
False
The network layer address for IP is ten bytes long when using IPv4.
False, it is 32 bits
____________ refers to bits that have been changed, in error, from 1 to 0, or vice versa, in a data transmission.
Flipped bits
The transport layer must break messages from the application layer into several _____ that can be sent to the network layer
Segments
___________ is an orderly close to a dialogue between end users.
Session Termination
Controlled access MAC approaches work better in a large network with high usage.
True
When we amplify the signal on an analog circuit, we also amplify any noise that is present on the circuit.
True
In a two-tier client-server architecture, a client computer needs to use an application layer software package called a ________________ to send e-mail:
mail user agent
____________ is one of the most commonly used coding schemes used in data transmission.
ASCII
With the two-tier client-server architecture, the server is responsible for the ________ logic.
Data access
Ethernet is an example of a network layer protocol.
False, Ethernet is Data-link
A(n) _________-tiered architecture uses only two sets of computers: one set of clients and one set of servers.
Two
A typical TCP segment has a _______ header of control information.
192-bit
Server name resolution is done using the:
Domain Name Service (DNS)
The earliest type of fiber optic systems were:
Multimode
The _________ layer is responsible for routing of messages from the sender to the final destination.
Network Layer
In a ___________ architecture, computers are both client and server, thus sharing the work.
Peer-to-peer
In the three tier architecture, the software on the client computer is responsible for the ____________.
Presentation logic
________ is the presentation of information to the user and the acceptance of the user's commands.
Presentation logic
___________ is the process of determining the path that a message will travel from sending computer to receiving computer.
Routing
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?
Transport
A walkie-talkie is an example of half-duplex transmission.
True
Computers produce digital data whose values are binary: 0 or 1.
True
Contention is commonly used with Ethernet local area networks.
True
The primary reason for networking standards is to:
ensure that hardware and software produced by different vendors can work together
Assume that more than one application program is using the same communications line on a particular computer. To be able to decide to which application program a message should be delivered on this computer, TCP/IP relies on the:
port address
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
