Network +.db

Front 1

Network Layer -

The Network layer handles the movement of data between segments, a process call routing. A logical network address is assigned to the network segment, and a logical node address is assigned to the station at this layer.

* * Assigns network segment addresses and logical node addresses, packages data into datagrams, routes data between segments.

What is the layer number?

Back 1

The Network Layer is Layer 3.

Front 2

Application Layer -

The Application layer is where services such as electronic messaging and file transfers take place. This is the layer where the end user will interact with the network.

* * User interfact to the network, network applications.

What layer number is this?

Back 2

The Application Layer is Layer 7

Front 3

What is a internetwork?

Back 3

An Internetwork is any group of computers that are connected in a way that allows users to exchange data and share services. There are no geographic boundaries set on an internetwork.

Front 4

Identify the seven layers of the OSI Reference Model.

Back 4

Mnemonic device for remembering the order of the layers of the OSI Reference Model:

All People Seem To Need Data Processing:

All - Aplication - Layer 7

People - Presentation - Layer 6

Seem - Session - Layer 5

To - Transport - Later 4

Need - Network - Layer 3

Data - Data Link - Layer 2

Processing - Physical - Layer 1

Front 5

Presentation Layer -

The Presentation layer handles the formatting of data. Two nodes will agree on the data format at the Presentation layer. Also encryption, decryption, compression, and expansion are all handled at the Presentation layer.

* * Handles Data transfer syntax, format of data, encryption, decryption, compression and expansion.

What is the layer number?

Back 5

The Presentation Layer is Layer 6.

Front 6

What toplogy is this?

computer server
\ /
(hub)
/ \
computer computer printer

Back 6

STAR topology

Front 7

Which layer of the OSI Reference Model contains both the Logical Link Control sub-layer and the Media Acccess Control sub-layer?

Back 7

The Data Link Layer.

Front 8

Which toplogy is a multipoint conneciton where all computers access the same single cable?

a. Mesh
b. Star
c. Ring
d. Bus

Back 8

d. Bus

Front 9

Which of the following requires ring-in ports to be connected to ring-out ports for two to be connected?

a. Hub
b. Repeater
c. MAU
d. Router

Back 9

c. MAU

Front 10

Which of the following is a disadvantage of using a MESH topology?

a. a cable fault is difficult to locate and disables the entire segment.
b. It uses a tremendous amount of cabling.
c. It requires knowlege of the neighboring nodes.
d. It need a controlling device to grant access to the media.

Back 10

b. It uses a tremendous amount of cabling.

Front 11

What is a segment?

Back 11

A segment is a portion of a network that is bounded by bridges,switches or routers.

Front 12

Which of the following is the best option to connect to a backbone?

a. client
b. server
c. printer
c. segment

Back 12

no sure of answer

Front 13

What is a network?

Back 13

A network is a group of computers that are able to communicate with each other. "Network" can refer either to a LAN or to a segment that exist within a LAN. Sometimes, "network" refers to a WAN (wide area network) or to an internetwork.

Front 14

Which of the following is a disadvantage of using a BUS topology?

a. a cable fault is difficult to locate and disables the entire segment.
b. It uses a tremendous amount of cabling.
c. It requires knowledge of the neighboring nodes.
d. It needs a controlling device to grant access to the media.

Back 14

a. a cable fault is difficult to locate and disables the entire segment.

Front 15

What is a backbone?

Back 15

A backbone is a segment that provides the primary path though the network, connecting multiple network segments.

Front 16

Which toplogy consists of multiple, redundant, point-to-point links?

a. Mesh
b. Star
c. Ring
d. Bus

Back 16

a. Mesh

Front 17

Which of the following topologies consists of a central device with end nodes connected in point-to-point links to it?

a. Mesh
b. Star
c. Ring
d. Bus

Back 17

b. Star

Front 18

What is MESH topology?

Back 18

The MESH topology consists of multiple, redundant, point-to-point links.

MESH topologies require a lot of cable to connect all the nodes.

Front 19

What is the RING topology?

Back 19

A RING toplogy is in the shape of a ring, where each node is connected in point-to-point links to two neighboring nodes until the last node is connected to the first, completing the ring.

The RING topology has a lot of overhead and is dificult to troubleshoot when a cable fault occurs.

Front 20

What is BUS topology?

Back 20

The BUS topology is a multipoing link whee all the nodes are connected to the same cable.

BUS topologies ae hard to troubleshoot when there is a cable fault because it's difficult to pinpoint the fault.

Front 21

What is a STAR topology?

Back 21

A STAR topology is in the shape of a star. It has a central device, which is connected to every other node o the segment in a point-to-point link.

The STAR topology is easy to troubleshoot.

Front 22

Which of the following network devices will operate at the Network layer?

Choose the two best answers.

a. Router
b. Hub
c. Bridge
d. Brouter

Back 22

a. Router
d. Brouter

Front 23

Which layer of the OSI Reference Model manages dialog between two network nodes?

Back 23

The Session Layer

Front 24

Which layer of the OSI Refence Model provides a reliable, connection-oriented datastream?

Back 24

The Transport Layer

Front 25

Fiber Optics
cablins is made of light conducting plastic or glass fibers that are encased with a protetive cladding, which is then surrounded by protective sheath.

Fiber Optics are lightweight and can carry more conductors than copper twisted-pair or coaaxial cabling can.

Back 25

advantages:

Fiber Optics are not susceptible to EMI; they do not leak signals; and they have a slower rate of signal attenuation so that they can carry signals for longer distances.

Front 26

What is the name applied to the type of data that can be expected at each layer?

Back 26

Physical----> Bits
Data Link----> Frames
Network ----> Datagrams
Transport----> Segments
Application----> Messages
All layers----> Packets

Front 27

The main advantage of twisted-pair wiring is that it is commonly used in telephone networks. It is a mature technology that can be used with telephone technology.

The disadvantage of twisted-pair is that it is sensitive to electromagnetic interference (EMI), which is also called crosstalk

What are the 2 basic types of Copper Twisted-Pair?

Back 27

UTP - unshielded twisted-pair
UTP is more common.

STP - shielded twisted-pair

Front 28

Coax cabling comes in many different types, but all of them are referred to as "coax".

What are the various coax types?

Back 28

RG-8 --> 50 ohmEthernet, called thicknet

RG-11 --> 50 ohmEthernet, called thicknet

RG-58 --> 50 ohmEthernet, called thicknet

RG-59 --> 75 ohmCable TV

RG-62 --> 93 ohmARCNET

Front 29

What are the advantages and disadvantages of coax cable?

Back 29

advantages:
It is a fairly mature and stable technology. Coax has a higher tolerance to EMI than twisted-pair does.

disadvantages:
This cabling is somewhat bulky and difficult to manipulate. Even though it is less susceptible to EMI, it can still be affected to EMI.

Front 30

What are the 4 media types?

Back 30

1. Copper twisted-pair cable

2. Coaxial cable

3. Fiber optic cable

4. Unbounded media, such as microwaves, infrared,laser and radio

Front 31

Which layer of the OSI Reference Model places data on the wire and manages signaling?

Back 31

The Physical layer.

Front 32

Which layer of the OSI Reference Model handles data-format issues such as encryption and compressions?

Back 32

The Presentation layer.

Front 33

Physical Layer -

The Physical layer is where data is placed onto the wire in the bitstream format. The Physical layer handles the electric or electronic signaling of the data. It also specifies the media-access method and the physical topology to be used.

* * Network media, connection specificaitons, electrical and electromagnetic signaling.

What is the layer number?

Back 33

The Physical Layer is Layer number 1.

Front 34

Data Link Layer -

This Data Link layer consists of two sub-layers = the Media Access Control (MAC) sub-layer and the Logical Link Control (LLC) sublayer. The Data Link layer organizes data into frames. A physical address (MAC) is assigned to the nod at this layer.

* * Organizes data into frames, assigns physical addresses, handles error and flow control.

What is the layer number?

Back 34

The Data Link Layer is Layer number 2.

Front 35

Session Layer -

The Session layer is directly applicable to dialogs that are created between two network nodes. The Session layer establishes, manages and terminated the dialog.

* * Handles dialog control, including establishing, maintaining and synchronizing the dialog.

What is the layer number?

Back 35

The Session Layer is Layer number 5

Front 36

Which layer of the OSI Reference Model is responsible for services such as electronic messaging.

Back 36

The Application Layer.

Front 37

Transport Layer -

The Transport layer provides a reliable, connection-oriented service. The Transport layer ensures that data is sent through acknowledgement messages (ACKs), that sequencing is used to assemble data in the correct order, and that flow control is used to maximize throughput.

* * Responsible for connection-oriented, reliable data transmission, flow control, error control, and message multilexing.

What is the layer number?

Back 37

The Transport Layer is Layer 4

Front 38

What is a LAN?

Back 38

A LAN is a group of computers that are linked in a way that enables their uses to share data and services. and that are located in close proximity goegraphically (usually within the boundaries of a building or campus).

Front 39

Which layer of the OSI Reference Model provides routing functionality?

Back 39

The Network Layer.