1 3 장 osi 기본 참조 모델 zosi : open system interconnection zbasic reference model :...
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3 장 OSI 기본 참조 모델
OSI : Open System InterconnectionBasic Reference Model : ISO-7498Purpose of OSI Model
~ is to open communication between different systems without requiring changes to the logic of the underlying hardware and software.
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목차
3.1 모델3.2 각 계층의 기능3.3 요약
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3.1 Model
OSI Model~ is layered framework for the design of network
systems that allows for communication across all types of computer systems
Layered Architecture~ shows the layers involved when a message is sent
from device A to device B
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Model(cont’d)
OSI Model
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Model(cont’d)
Physical
Data Link
Network
Transport
Session
Presentation
Application
Physical
Data Link
Network
Transport
Session
Presentation
Application
Physical
Data Link
Network
Physical
Data Link
Network
1st
2nd
3rd
1st
2nd
3rd
1st
2nd
3rd
Peer-to-peer protocol(7th layer)
Peer-to-peer protocol(6th layer)
Peer-to-peer protocol(5th layer)
Peer-to-peer protocol(4th layer)
7
6
5
4
3
2
1
7
6
5
4
3
2
12-1 interface
7-6 interface
6-5 interface
5-4 interface
4-3 interface
3-2 interface
7-6 interface
6-5 interface
5-4 interface
4-3 interface
3-2 interface
2-1 interface
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Model(cont’d)
Peer-to-peer process
~ process on each machine that communicate at a gi
ven layer
Interfaces between Layers
~ defines what information and services a layer muc
h provide for the layer above it
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Model(cont’d)
Organization of the Layers Layer 1, 2, 3(network support layers)
~ deal with the physical aspects of moving data from one device to another
Layer 5, 6, 7(user support layers)~ allow interoperability among unrelated software
systems
Layer 4(transport layer) ~ links the two subgroups and ensures that what the
lower layers have transmitted is in a form that the upper layers can use
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Model(cont’d)OSI 모델을 이용한 교환
T2 H2
H3
H4
H5
H6 H6
H5
H4
H3
H2T2
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3.2 각 계층의 기능
물리 층 (Physical Layer)
데이터 링크 층 (Data Link Layer)
네트워크 층 (Network Layer)
전송 층 (Transport Layer)
세션 층 (Session Layer)
표현 층 (Presentation Layer)
응용 층 (Application Layer)
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물리 층 (Physical Layer)
~ coordinates the functions required to transmit a bit stream over a physical medium.
(deal with the mechanical and electrical specification of the primary connections: cable, connector)
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물리 층 (cont’d)
Physical Layer
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물리 층 (cont’d)
고려사항 회성 구성 (Line configuration)
데이터 전송 모드 (Data transmission mode)
토폴로지 (Topology)
신호방식 (Signals): 신호유형 부호화 (Encoding)
인터페이스 (Interface)
전송매체 (Medium)
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데이터 링크 층 (Data Link Layer)
~ is responsible for delivering data units(group of bits) from one station to the next without errors.
~ It accepts a data unit from the third layer and adds meaningful bits to the beginning(header) and end(trailer) that contain addresses and other control information: Frame
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데이터 링크 층 (cont’d)
Data Link Layer
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데이터 링크 층 (cont’d)
Specific responsibilities node-to-node 전달 (delivery): station-to-station
주소지정 (Addressing)
액세스 제어 (Access control)
흐름 제어 (Flow control)
에러 처리 (Error handling)
동기화 (Synchronization)
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데이터 링크 층 (cont’d)
Data Link Layer( 예 3.1)
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네트워크 층 (Network Layer)
~ is responsible for the source-to-destination delivery of a packet across multiple network link.
cf: the data link oversees station-to-station(node-to-node) delivery.
~ provides two related services. Switching Routing
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네트워크 층 (cont’d)
Switching~ refer to temporary connections between physical
links, resulting in longer links for network transmission.(ex: telephone conversation)
routing~ means selecting the best path for sending a packet
from one point another when more than one path is available
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네트워크 층 (cont’d)
Network Layer
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네트워크 층 (cont’d)
Specific responsibilities Source-to-destination delivery(packet)
Logical addressing
Routing
Address transformation
Multiplexing
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네트워크 층 (cont’d)
예 3.2
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네트워크 층 (cont’d)
예 3.2(cont’d)
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전송 층 (Transport layer)
~ is responsible for source-to destination (end-to-end) delivery of the entire message.
cf: the network layer oversees end-to-end delivery of individual packet.
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전송 층 (cont’d)
Transport Layer
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전송 층 (cont’d)
Specific responsibility End-to-end message delivery
Service-point(port) addressing
Segmentation and reassembly
Connection control
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전송 층 (cont’d)
예 3.3
Physical link
T2
T2
H2
H2
T2
T2
H2
H2
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세션 층 (Session Layer)
~ is the network dialog controller
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세션 층 (cont’d)
Specific responsibility Session management
Synchronization
Dialog control
Graceful close
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표현 층 (Presentation Layer)
~ ensures interoperability among communicating devices.
~ is responsible for the encryption and decryption of data for security purpose and for the compression and expansion of data when necessary for transmission efficiency.
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표현 층 (cont’d)
Presentation Layer
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표현 층 (cont’d)
Specific responsibility Translation Encryption Compression Security
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응용 층 (Application Layer)
~ enables the user, whether human or software, to access the network.
~ provides user interfaces and support for services.
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응용 층 (cont’d)
Application Layer
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응용 층 (cont’d)
Specific services Network virtual terminal
File access, transfer, and management
Mail services
Directory services
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각 계층의 기능 요약