Shared Flashcard Set

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Master P OSI Model Pt1
Network+ Certification Prep
63
Computer Networking
Professional
01/06/2014

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Cards

Term
What is the top or last layer in the OSI model
Definition
Layer 7 - Application Layer
Term
What is Layer 6 in the OSI model?
Definition
Presentation Layer
Term
What is Layer 5 in the OSI model
Definition
Session Layer
Term
What is layer 5 in the OSI model
Definition
Transport
Term
What is layer 3 in the OSI model
Definition
Network Layer
Term
What is layer 2 in the OSI model
Definition
Data-link
Term
What is layer 1 in the OSI model
Definition
Physical
Term
This layer's charteristics are:

type of media used (such as cable, connector, pinout); identifies topology to be used (such as ring, mesh, star & bus); defines voltage on media & frequency at which signals that carry the data move from one state to another dictating speed, bandwidth & max distance media can be used.
Definition
Layer 1 - Physical
Term
This layer is responsible for getting data to physical layer. Also responsible for error detection, error correction and hardware addressing.
Definition
Data-Link Layer.
Term
The term frame is used to describe the logical grouping of data at this layer?
Definition
Data-Link
Term
What are the 2 sublayers of the Data-link layer?
Definition
MAC & LLC
Term
This sublayer controls access to network media & defines the physical address
Definition
MAC layer
Term
This sublayer is is specified in 802.2 & responsible for error and flow conrol mechanisms
Definition
LLC Layer
Term
The primary responsibility of this layer is routing.
Definition
Network Layer
Term
This layer does not specify how data is passed but rather provides the mechanisms to do so.
Definition
Network Layer
Term
Protocols at this layer are responsible for route selection
Definition
Network Layer
Term
The term packet is used to describe the logical grouping of data at this layer.
Definition
data-link layer
Term
This layer provides mechanisms to move data between network devices
Definition
Transport layer
Term
What are the 3 ways layer 4 uses to move data between network devices
Definition
The transport layer uses error checking, service addressing & segmentation.
Term
The transport layer makes sure that data is passed to the right service at the upper layers of the OSI model. What is this referred to as?
Definition
Service addressing
Term
blocks of data need to be broken down in layer 4 for the lower layers to handle. What is this process called?
Definition
segmentation
Term
protocols that operate at this layer can be either connectionless or connection oriented
Definition
transport layer
Term
This layer is responsible for flow control
Definition
transport layer
Term
This refers to the way in which the receiving device can accept data transmissions
Definition
flow control
Term
What are the 2 common methods of flow control used
Definition
buffering & windowing
Term
When this is used, data is temporarily stored & waits for the destination device to become available.
Definition
transport layer buffering flow control
Term
In this environment, data is sent in groups of segments that require only 1 acknowledgment
Definition
Transport layer flow control windowing
Term
This layer is responsible for managing & controlling the synchronization of data between applications on 2 devices
Definition
session layer
Term
This layer establishes, maintains and breaks sessions
Definition
session layer
Term
The transport layer is responsible for setting up & maintaining connections on between 2 nodes, this layer performs the same function on behalf of the application
Definition
session layer
Term
The basic function of this layer is to convert the data intended for or received from the application layer into another format.
Definition
Presentation Layer
Term
commmon data formats converted by this layer include graphics files, text & data.
Definition
Presentation layer
Term
This layer handles encryption and decryption
Definition
presentation layer
Term
this layer takes requests and data from users and pass them on.
Definition
Application layer
Term
some basic services of this layer include file & print
Definition
application layer
Term
This layer defines the physical structure of the network and the topology.
Definition
Physical (level 1)
Term
This layer provies error detection and correction. Uses 2 sub layers. Identifies methods by which media is accessed. Defines hardware addressing
Definition
Data-Link (layer 2)
Term
This layer handles discovery of destination systems and addressing. Provides mechanism by which data can be passed from one network system to another.
Definition
network (layer 3)
Term
This layer provides connection services between the sending and receiving devices and ensures reliable data delivery. Manages flow control through buffering or windowing. Provides segmentation, error checking and service identification.
Definition
transport layer
Term
This layer synchronizes the data exchange between applications on separate devices
Definition
session layer
Term
This layer translates data from applications to a format that can be transmitted across the network. Handles encryption & decryption of data. Provides compression and decompression.
Definition
Presentation layer
Term
Provides access to the network for software programs
Definition
application layer
Term
Application (Layer 7)
Definition
This layer supports application and end-user processes. Communication partners are identified, quality of service is identified, user authentication and privacy are considered, and any constraints on data syntax are identified. Everything at this layer is application-specific. This layer provides application services for file transfers, e-mail, and other network software services.
Term
Presentation (Layer 6)
Definition
This layer provides independence from differences in data representation (e.g., encryption) by translating from application to network format, and vice versa. This layer formats and encrypts data to be sent across a network, providing freedom from compatibility problems. It is sometimes called the syntax layer.
Term
Session (Layer 5)
Definition
This layer establishes, manages and terminates connections between applications. The session layer sets up, coordinates, and terminates conversations, exchanges, and dialogues between the applications at each end. It deals with session and connection coordination.
Term
Transport (Layer 4)
Definition
This layer provides transparent transfer of data between end systems, or hosts, and is responsible for end-to-end error recovery and flow control. It ensures complete data transfer.
Term
Network (Layer 3)
Definition
This layer provides switching and routing technologies, creating logical paths, known as virtual circuits, for transmitting data from node to node. Routing and forwarding are functions of this layer, as well as addressing, internetworking, error handling, congestion control and packet sequencing.
Term
Data Link (Layer 2)
Definition
At this layer, data packets are encoded and decoded into bits. It furnishes transmission protocol knowledge and management and handles errors in the physical layer, flow control and frame synchronization. The data link layer is divided into two sublayers: The Media Access Control (MAC) layer and the Logical Link Control (LLC) layer. The MAC sublayer controls how a computer on the network gains access to the data and permission to transmit it. The LLC layer controls frame synchronization, flow control and error checking.
Term
Physical (Layer 1)
Definition
This layer conveys the bit stream - electrical impulse, light or radio signal -- through the network at the electrical and mechanical level. It provides the hardware means of sending and receiving data on a carrier, including defining cables, cards and physical aspects.
Term
List the 7 OSI Layers
Definition
Application
Presentation
Session
Transport
Network
Data Link
Physical
Term
Layer 7 Example
Definition
Application
DHCP, DNS, FTP, HTTP, IMAP4, NNTP, POP3, SMTP, SNMP, SSH, TELNET and NTP
Term
Layer 6 Example
Definition
Presentation
SSL, WEP, WPA, Kerberos,
Term
Layer 5 Example
Definition
Session
Logical Ports 21, 22, 23, 80 etc…
Term
Layer 4 Example
Definition
Transport
TCP, SPX and UDP
Term
Layer 3 Example
Definition
Network
IPv4, IPV6, IPX, OSPF, ICMP, IGMP and ARP
Term
Layer 2 Example
Definition
Data Link
802.11 (WLAN), Wi-Fi, WiMAX, ATM, Ethernet, Token Ring, Frame Relay, PPTP, L2TP and ISDN-
Term
Layer 1 Example
Definition
Physical
Hubs, Repeaters, Cables, Optical Fiber, SONET/SDN,Coaxial Cable, Twisted Pair Cable and Connectors
Term
OSI Layer Model
Hubs/Repeaters
Definition
are found in the Physical Layer
Term
OSI Layer Model
Switches /Bridges/Wireless Access Point
Definition
are found in the Data Link Layer
Term
OSI Layer Model
Multilayer Switch
Definition
are found in both the Data Link Layer and Network Layer
Term
OSI Layer Model
Routers
Definition
are found in the Network Layer
Term
OSI Layer Model
Gateway
Definition
are found in All 7 of the OSI Layers
Term
OSI Layer Model
Brouter
Definition
are found in both the Data Link and Network Layer
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