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Which layer of the OSI model is responsible for ensuring flow control so that the destination Answer: B
station does not receive more packets that it can process at any given time?
a. presentation Layer
b. transport Layer
c. physical Layer
d. session Layer
e. application Layer
Which layer of the OSI model is responsible for ensuring that all packets sent are received by Answer: B
the destination station by dealing with end-to-end issues?
a. presentation Layer
b. transport Layer
c. physical Layer
d. session Layer
e. application Layer
In the Internet model, the application layer corresponds to the , layer(s) s of the OSI Answer: B
model.
a. data link and network
b. session, presentation and application
c. application layer
d. application and presentation
e. network, transport and presentation
The layer is responsible for routing of messages from the sender to the final Answer: d
destination.
a. data communication layer
b. resident layer
c. application layer
d. network layer
e. physical layer
Which of the following is a term used to group together the physical and data link layers? Answer: B
a. Internetwork layers
b. Hardware layers
c. Software layers
d. Middleware layers
e. Application layers
As part of the five-layer network model used in this textbook, the data link layer sits Answer: E
directly between:
a. the physical and the application layers
b. the network and the application layers
c. the network and transport layers
d. the physical and the application layers
e. the physical and the network layers
Which of the following is true with respect to the data link layer? Answer: B
a. It accepts streams of bits from the application layer.
b. It is responsible for getting a message from one computer to another (one node to
another) without errors.
c. It does not perform error detection.
d. It performs routing functions.
e. It organizes data from the physical layer and passes these coherent messages to
the application layer.
The layer of the OSI model is responsible for data format translation. Answer: B
a. session
b. presentation
c. physical
d. application
,e. transport
The fourth layer of the OSI model is called the layer. Answer: B
a. network
b. transport
c. session
d. data link
e. presentation
In which layer of the Internet model would the HTTP standard be used? Answer: B
a. physical
b. application
c. transport
d. network
e. data link
Data communication standards enable each layer in the sending computer to communicate Answer:
with its corresponding layer in the receiving computer. True
Which of the following is not true about formal standards? Answer: A
a. They are always developed before de facto standards.
b. One example exists for network layer software (IP).
c. They can be developed by an official industry body.
d. They can take several years to develop.
e. They can be developed by a government body.
The primary reason for networking standards is to: Answer: B
a. simplify cost accounting for networks
b. ensure that hardware and software produced by different vendors can work together
c. make it more difficult to develop hardware and software that link different networks
d. ensure that all network components of a particular network can be provided by only
one vendor
e. lock customers into buying network components from one vendor
Which of the following is not true about de facto standards? Answer: A
a. They never evolve into formal standards.
b. They are those standards that emerge in the marketplace.
c. They tend not to be developed by an official industry or government body.
d. They are generally supported by more than one vendor but de facto standards have no
official standing.
e. They tend to emerge based upon the needs/response of the marketplace.
ensure that hardware and software produced by different vendors work together. Answer: B
a. Delimiters
b. Standards
c. ASPs
d. RBOCs
e. Intranets
The three stages of the formal standardization process are . Answer: A
a. specification, identification of choices and acceptance.
b. planning, implementing and acceptance.
c. brainstorming, identification and implementing.
d. specification, formalization, and acceptance.
e. none of the above.
Which of the following is not an important future trend in communication and networking? Answer: A
a. development of online batch systems
b. integration of voice, video, and data
c. pervasive networking
d. provision of new information services on rapidly expanding networks
e. development of extremely high speed broadband networks
Pervasive networking means that: Answer: D
a. the five-layer network model will be used to design all networks
,b. all networks of the future will be developed by a monopolistic organization
c. the cost of computers will be higher in the future
d. virtually all computers will be networked in some way to other computers and be able
to transmit data at staggeringly fast rates
e. cable companies will offer more than 150 network selections for viewers
Which of the following is not an important future trend in communication and networking? Answer: A
a. development of online batch systems
b. integration of voice, video, and data
c. pervasive networking
d. provision of new information services on rapidly expanding networks
e. development of extremely high speed broadband networks
The integration of voice, video, and data communications is also known as . Answer: A
a. convergence
b. peer-to-peer networks
c. metropolitan wide networks
d. regional bell operating company
e. intranet
The high bandwidth requirements (high communications needs) for video have slowed its Answer:
integration into computer networks. True
One underlying problem with a host-based network is that: Answer: B
a. there are economies of scale because all computer resources are centralized
b. the server can get overloaded since it must process all messages
c. the architecture is relatively simple and works well
d. the server is the one point of control which simplifies security
e. clients (terminals) do not require sophisticated hardware/software because they do
not perform most of the work in this type of architecture
With respect to costs for a client-server network, which of the following is true? Answer: C
a. Personal computers used as clients in a client-server network cost about the same
as mainframes for the same amount of computing power.
b. More network capacity, which costs more money, is required for client-server networks
than for client-based networks.
c. Experts believe that client server architectures can be complex, but that
developing application software for host based architectures is usually cheaper.
d. Updating the network with new version of software tends to be less expensive in a
client- server network since the software is centralized in one client.
e. None of the above
A "thick client" architecture approach: Answer: C
a. always is a two-tier network architecture
b. always is an n-tiered architecture
c. places all or almost all of the application logic on the client
d. places all or almost all of the application logic on the server
e. refers to the size of the cable connecting the clients to the network
With the "thin client" architecture, when an application changes, only the with the Answer: B
application logic needs to be updated.
a. client
b. server
c. middleware
d. hardware
e. software
With a client-based network, one fundamental problem is that: Answer: D
a. the clients each must store all the data
b. the server does not have any data storage capability
c. the host or server must perform presentation logic, application logic, and data access logic
at the same time
d. all data on the server must travel to the client for processing
, e. the clients must perform the data storage logic
With the two-tier client-server architecture, the client is responsible for the logic and Answer: B
the server is responsible for the logic.
a. Application; presentation
b. Presentation; data access
c. Data access; presentation
d. Application; data access
e. Presentation; application storage
How are the application architecture functions split up in a client-server network? Answer: C
a. the presentation logic and data storage are on the client, while the data access logic is on
the server
b. the data storage, data access, and presentation logic are on the client
c. the presentation logic is on the client, while the data storage and data access logic are on
the server
d. the data storage and data access logic are on the client, while the presentation logic are on
the server
e. the presentation logic and data access logic are on the client, and the data storage is on the
server
In a client-server network, gets software from different vendors to work together. Answer: C
a. a front-end processor
b. serverware
c. middleware
d. centerware
e. programmer
Client-server architectures: Answer: C
a. cannot connect computers that use different hardware
b. are one of the least used network architectures today
c. can use middleware to provide a standard way of communicating between software
from more than one vendor
d. assign the responsibility for the presentation logic to the server
e. were the earliest type of network architectures
A(n) -tiered architecture uses only two sets of computers: one set of clients and Answer: B
one set of servers.
a. one
b. two
c. three
d. five
e. n
In the three tier architecture the software on the client computer is Answer: A
responsible for .
a. presentation logic
b. application logic
c. data access logic
d. data storage
e. application storage
An N-tiered architecture: Answer: A
a. is generally more "scalable" than a three-tiered architecture
b. is generally less "scalable" than a three-tiered architecture
c. uses only two sets of computers in which the clients are responsible for the application
and presentation logic, and the servers are responsible for the data
d. uses exactly three sets of computers in which the client is responsible for presentation, one
set of servers is responsible for data access logic and data storage, and application logic is
spread across two or more different sets of servers
e. puts less load on a network than a two-tiered architecture because there tends to be
less communication among the servers
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