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39 Cards in this Set

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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?
The Network Layer is Layer 3.
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?
The Application Layer is Layer 7
What is a internetwork?
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.
Identify the seven layers of the OSI Reference Model.
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
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?
The Presentation Layer is Layer 6.
What toplogy is this?

computer server
\ /
(hub)
/ \
computer computer printer
STAR topology
Which layer of the OSI Reference Model contains both the Logical Link Control sub-layer and the Media Acccess Control sub-layer?
The Data Link Layer.
Which toplogy is a multipoint conneciton where all computers access the same single cable?

a. Mesh
b. Star
c. Ring
d. Bus
d. Bus
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
c. MAU
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.
b. It uses a tremendous amount of cabling.
What is a segment?
A segment is a portion of a network that is bounded by bridges,switches or routers.
Which of the following is the best option to connect to a backbone?

a. client
b. server
c. printer
c. segment
no sure of answer
What is a network?
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.
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.
a. a cable fault is difficult to locate and disables the entire segment.
What is a backbone?
A backbone is a segment that provides the primary path though the network, connecting multiple network segments.
Which toplogy consists of multiple, redundant, point-to-point links?

a. Mesh
b. Star
c. Ring
d. Bus
a. Mesh
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
b. Star
What is MESH topology?
The MESH topology consists of multiple, redundant, point-to-point links.

MESH topologies require a lot of cable to connect all the nodes.
What is the RING topology?
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.
What is BUS topology?
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.
What is a STAR topology?
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.
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
a. Router
d. Brouter
Which layer of the OSI Reference Model manages dialog between two network nodes?
The Session Layer
Which layer of the OSI Refence Model provides a reliable, connection-oriented datastream?
The Transport Layer
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.
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.
What is the name applied to the type of data that can be expected at each layer?
Physical ----> Bits
Data Link ----> Frames
Network ----> Datagrams
Transport ----> Segments
Application ----> Messages
All layers ----> Packets

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?
UTP - unshielded twisted-pair
UTP is more common.

STP - shielded twisted-pair
Coax cabling comes in many different types, but all of them are referred to as "coax".

What are the various coax types?
RG-8 --> 50 ohm Ethernet, called thicknet

RG-11 --> 50 ohm Ethernet, called thicknet

RG-58 --> 50 ohm Ethernet, called thicknet

RG-59 --> 75 ohm Cable TV

RG-62 --> 93 ohm ARCNET
What are the advantages and disadvantages of coax cable?
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.
What are the 4 media types?
1. Copper twisted-pair cable

2. Coaxial cable

3. Fiber optic cable

4. Unbounded media, such as microwaves, infrared,laser and radio
Which layer of the OSI Reference Model places data on the wire and manages signaling?
The Physical layer.
Which layer of the OSI Reference Model handles data-format issues such as encryption and compressions?
The Presentation layer.
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?
The Physical Layer is Layer number 1.
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?
The Data Link Layer is Layer number 2.
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?
The Session Layer is Layer number 5
Which layer of the OSI Reference Model is responsible for services such as electronic messaging.
The Application Layer.
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?
The Transport Layer is Layer 4
What is a LAN?
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).
Which layer of the OSI Reference Model provides routing functionality?
The Network Layer.