Term
| Open Systems Interconnection Model |
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Definition
Layer 7) Application
Layer 6) Presentation
Layer 5) Session
Layer 4) Transport
Layer 3) Network
Layer 2) Data Link
Layer 1) Physical |
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Term
| Application Layer (Layer 7) |
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Definition
Layer 7
1) Controls partnering applications and forms a consensus on procedures for controlling data integrity and error recovery
2) The application layer acts as an interface between the program and the next layer down.
3) Is responsible for identifying and establishing the availability of the intended communication partner and determining whether sufficient resources for the requested communications exist.
4) Examples: Email, file transfer, RDP, printing. |
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Term
| Presentation Layer (Layer 6) |
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Definition
1) Presents data to the application layer
2) Responsible for data translation and code formatting
3) Code formatting includes decompression,encryption, and decryption |
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Term
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Definition
1) Responsible for setting up, managing, and then tearing down sessions between presentation layer entities.
2) Coordinates communication through three modes: Simplex, Half Duplex and Full Duplex.
3) Keeps Applications Data separate from other applications. |
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Term
| Transport Layer (Layer 4) |
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Definition
1) Segments and reassembles data into data streams
2) Can establish a logical connection between sending and destination hosts on a network
3) Responsible for providing the mechanisms for multiplexing upper-layer applications, establishing virtual connections, and tearing down virtual circuits.
4) TCP/UDP live here. |
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Term
| Connection-Oriented Communication |
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Definition
1) A TCP process that initiates the threeway handshake: Syn - Syn/Ack - Ack.
2) After the three way handshake, the connection established and data can begin to transfer. This virtual circuit is called overhead.
3) Is connection oriented if:
i) A virtual circuit is set up.
ii)Uses sequencing.
iii)Uses acknowledgments.
iiii) Uses Flow Control.
4) Falls under Transport layer |
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Term
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Definition
1) Flow control provides a means for the receiver to govern the amount of data sent by the sender. This prevents overflowing the buffers.
2) The following will be achieved:
A) The segments delivered are acknowledged back to the sender upon their reception
B) Any segments now acknowledged will be resent.
C) Segments are sequenced back into their proper order upon arrival at their destination.
D) A manageable data flow is maintained in order to avoid congestion, overloading, and data loss. |
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Term
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Definition
| A flow control measure that allows the sender or receiver to send a "Not Ready" packet when the buffer is full. |
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Term
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Definition
| The Quantity of data segments (measured in bytes) that the transmitting machine is allowed to send without receiving an acknowledgment. |
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Term
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Definition
| A technique that requires the receiving machine by sending the source an acknowledgment packet when it has received the data. |
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Term
| The network devices that operate on all 7 layers of the OSI Model |
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Definition
1) Network Management Stations
2) Web and Application servers
3) Gateways
4) Network Hosts |
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Term
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Definition
1) Manages logical device addressing.
2) Transports traffic between devices that arent locally attached. |
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Term
| Two Types of packets and their protocols in the Network Layer |
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Definition
Data Packets:
1) Used to transport user fata through the internework. Protocols include IPv4 and IPv6
Route-Update Packets:
1) Used to update neighboring routers about the networks connected to all routers within the internetwork.
2) Help maintain routing tables.
Route update protocols include:
1)Routing information Protocol (RIP)
2) RIPV2
3) Enhanced Interior Gatewy Routing Protocol (EIGRP)
4) Open Shortest Path First (OSPF) |
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Term
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Definition
1) Routers by default, wont forward broadcast to multicast packets.
2) Routers use logical address in a network layer header to determine the net hop router to forward the packet to.
3) Routers can use access lists, created by an admin, to control security on the types of packets that are allowed to enter or exit an interface.
4) Routers can provide layer 2 bridging functions if needed.
5) Layer 3 devices provide connections between VLANs
6) Routers can provide quality of Service for specific types of network traffic. |
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Term
| Data Link Layer (Layer 2) |
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Definition
1) Provides physical transmission of the data and handles error notification, network topology, and flow control.
2) Delivers via MAC address.
3) The DLL formats the message into pieces called data frame and adds a customized header containing the source and destination hardware address. |
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Term
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Definition
| LAN/MAN and Media Access Control Bridges. |
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Term
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Definition
| Logical Link Control (Responsible for identifying Network Layer protocols and then encapsulating them. The LLC tells the Data Link Layer what to do after the frame has been received) |
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Distributed Queue Dual Bus (DQDB) |
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Term
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Definition
| Broadband Local Area Networks |
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Term
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Definition
| Fiber-Optic LANS and WANS |
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Demand Priority Access Method |
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Term
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Definition
| Wireless Area Personal Network |
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Term
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Definition
| Wireless Metropolitan Area Netowork |
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Term
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Definition
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Term
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Definition
| LAN/MAN Standards Committee. |
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