COMP 4230 Exam 1

The Internet is a network covering typically \_____

A planet

Transmission lines on WANs are in general made of \_______.

Radio links
optical fiber
copper wire

Your wireless network at home is a \_____

LAN

\___ connect two or more \___

switches
transmission lines

On networks, the machines that run users programs (applications) are most likely called \________.

hosts

On a \______________ network, frames (packets) sent by any machine on that link are received (heard) by a subset of machines.

multicast

A wide area network (WAN) is a network covering typically \_____

A planet
Country
Continent

Wifi uses the \____________ standard.

IEEE 802.11

\_________ is the design issue that consists of avoiding that a sender overwhelms a receiver.

Flow Control

\_________ \________ is the design issue that consists of finding errors in the received information.

error detection

A network is a set of \___________ devices which can communicate.

independent

To reduce their design complexity, most networks architectures are organized as \___________.

levels, stacks, layers

\________________ consists of correcting errors in the received information.

error correction

Congestion Control insures that a [Select] does not overwhelms the [Select]

sender, intermediary nodes and receiver

Layers at the same level on two communicating machines are called \_________ .

peer layers

The purpose of each layer is to offer services to the layer just \________ it.

above

This course will focus on two reference models.

TCP/IP Reference Model
OSI Reference Model

Check all that apply to the OSI reference model.

-It is a good education tool to understand networks
-It is an international standard of networks
-It is a thorough representation of computer networks

A 1 gigabits/s (Gbps) bit rate is \_____________ bits per second.

1,000,000,000

\_________ is the design issue that consists of identifying the senders and receivers.

addressing

Your wireless network at home (to access the Internet) uses most likely the \________ standard.

IEEE 802.11

On WANs, switches are called \___________.

routers

Bluetooth is a technology that could work for these types of networks

PAN (Personal Area Network)
LAN (Local Area Network)

Layered design consists of \________________.

restricting communications to adjacent or peer layers
layers hiding details from each other
dividing a complex task in multiple subtasks

A protocol defines the communications rules between \_________ layers.

peer

\_________________ is the design issue that consists of finding a path (list of switchs to traverse) between a source host and a destination host.

Routing

A list of the protocols used by certain system, one protocol per layer, is called a \_______ \__________.

protocol stack

\_________ \________ is the design issue that consists of correcting errors in the received information.

Error correction

Each layer requests service(s) from the layer just \________ it.

below

The key objectives/benefits of a layered design are:

-The serviced layer does have to worry about the details belonging to the serving layer (service provider)

-Simplify a complex function/service by partitioning it into smaller functions

\_________ is the design issue that consists of avoiding that a sender overwhelms the receiver and any intermediary nodes.

Congestion control

The rules governing the request/delivery of a service between adjacent layers is called \_______________.

an interface

These layers are part of the OSI Reference Model.

Application
Presentation
Session
Transport
Network
Data Link
Physical

In the OSI reference model, the [name1] layer provides service directly to the application layer.

presentation

In the OSI reference model, the [name1] layer receives service directly from the session layer.

presentation

In the OSI reference model, this layer is an intruder (i.e., it does not belong within this list of options).

Application


\------------------------------------------

Physical
None of the above
Network
Application
Data Link

The number of layers in the OSI Reference model is \____________ .

seven

In the OSI reference model, the [name1] layer provides service directly to the data link layer.

physical

The OSI Reference Model includes this (these) layer(s).

Transport
Physical
Application

The OSI Reference Model includes this (these) layer(s).

Transport
Session
Network

The OSI Reference Model includes this (these) layer(s).

Transport
Data Link
Presentation

Check all true statements about the OSI reference model.

-The physical layer will be active on ALL nodes of a conversation.
-The network layer is a point-to-point layer.
-The transport layer is an end-to-end layer

In the OSI reference model, these layers are end-to-end layers.

Presentation
Session
Application
Transport

In the OSI reference model, these layers are point to point layers.

Physical
Data link
Network

In the OSI reference model, the [name1] layer receives service directly from the data link layer.

Network

This (These) layer(s) are part of the OSI Reference Model.

Physical
Data Link
Network

In the OSI reference model, this layer is an intruder (i.e., it does not belong within this list of options).

Session

\------------------------------------------
Network
Session
None of the above
Physical
Data Link

In the OSI reference model, these layers are active only on devices at the end points of a conversation.

Application
Transport
Session
Presentation

In the OSI reference model, the [name1] layer provides service directly to the network layer.

data link

In the OSI reference model, this layer is an intruder (i.e., it does not belong within this list of options).

Data Link


\------------------------------------------
None of the above
Application
Presentation
Data Link
Transport

In the OSI reference model, the [name1] layer provides service directly to the transport layer.

Network

In the OSI reference model, this layer is an intruder (i.e., it does not belong within this list of options).

Presentation


\------------------------------------------

None of the above
Network
Data Link
Presentation
Physical

In the OSI reference model, this layer is an intruder (i.e., it does not belong within this list of options).

Physical
\-------------

Presentation
Session
Physical
Transport
None of the above

In the OSI reference model, this layer deals with how different machines map data in memory.

Presentation

In the OSI reference model, this layer is the lowest end to end layer (closest to the physical layer).

Transport

Check the protocol(s) that belong(s) to the presentation layer

IEEE 754

The application layer provides this (these) service(s).

communicates with the end user.
allows the end users to use the network services.

In the OSI reference model, this end-to-end layer deals with error control and flow control (besides other functions).

Transport

In the OSI reference model, this layer is the closest to the "user".

Application

A popular wireless MAN uses the \___________ standard.

IEEE 802.16

A personal area network (PAN) is a network covering typically \_____

A small car

\____________ is a popular wireless MAN protocol.

WiMax

An interface defines the primitive operations and services between \_________ layers.

adjacent

A wireless LAN uses most likely the \________ standard.

IEEE 802.11

A 1 megabits/s bit (Mbps) rate is \_____________ bits per second.

1,000,000

A 1 kilobits/s (Kbps) bit rate is \_____________ bits per second.

1,000

An interface defines the primitive operations and services between \_________ layers.

adjacent

A set of layers and protocols is called a \_______ \__________.

network architecture

This issue is not a network software issue

Memory footprint

\---------------------------------------
Scalability
None of these answers
Confidentiality or authentication
Memory footprint
Routing

This issue is not a network software issue

Energy/Power management


\-------------------------------
Energy/Power management
Addressing, naming
Routing
Error detection or correction
None of these answers

This issue is not a network software issue

Congestion or flow control
Confidentiality or authentication
Routing
None of these answers
Scalability

None of these answers

Check all true statements

NOT UDP identifies upper processes (applications) using the IP address
NOT TCP identifies upper processes (applications) using the IP address

A(n) \__________ is a set of rules defining communications between adjacent layers.

interface

Peer layers use a [name1] to communicate.

protocol

The OSI reference model has \_____ end-to-end layers and \_____ point-to-point layers.

4, 3

In the OSI reference model, the [name1] layer receives service directly from the transport layer.

Session

Ethernet uses the \____________ standard.

IEEE 802.3

Today, most wired LANS run at speeds from \________ up to \________ .

NOT 1 Mbps up to 100 Gbps (both could be wrong, or just one could be wrong)

Designs that continue to perform well when the network gets large are said to be \___________.

scalable

A(n) \__________ is a set of rules defining communications between peer layers.

protocol

In the OSI reference model, this end-to-end layer deals with addressing and congestion control (besides other functions).

Transport

In the OSI reference model, the transport layer does not provide/perform this (these) service/function(s).

None of these answers

The transport layer offers in general these services/functions.

error control
congestion control
addressing/naming
flow control

The transport layer provides this (these) service(s).

handles congestion
detects transmission errors
splits messages too large for the network

These are the underlying design constraints that resulted in what the OSI Reference Model is today

PARTIAL - 3.13/6.25
The flow of information through interfaces must be minimal

NOT The flow of information through protocols must be minimal.

\______________ links connect individual pairs of machines.

PARTIAL
NOT bus

Point-to-point transmission with exactly one sender and exactly one receiver is sometimes called \___________.

unicasting

On a \______________ medium, frames (packets) sent by any machine on that medium are received (heard) by all other machines on the medium.

broadcast

Bluetooth is a technology that could work well to connect \______

-a central unit (computer) with the standard inputs/outputs
-Wireless speakers to an entertainment center
-Audio system to your cellphone in a car

A header is a message exchange between Layer n and Layer \________.

n

A local area network (LAN) is a network covering typically \_____

One small campus
One room
One small building

The application layer offers in general these services/functions.

specialized services to users that lower layers do not offers
addressing/naming

Check the protocol(s) that belong(s) to the transport layer

UDP
TCP

The presentation layer provides this (these) service(s).

allows machines with different data representations to communicate.

Check the protocol(s) that belong(s) to the application layer

DNS
SMTP
HTTP
SSH

The presentation layer provides this (these) service(s).

allows machines with different data representations to communicate.

For a conversation, these layers (OSI reference model) will be active on all endpoints

Physical
Transport
Data Link
Application
Network

In the OSI reference model, the [name1] layer provides service directly to the session layer.

Transport

In the OSI reference model, the [name1] layer provides service directly to the presentation layer.

Session

In the OSI reference model, the [name1] layer receives service directly from the network layer.

Transport