ENGS 112 Lecture 3 Packet Switching Chapter 3, Walrand WWW links, eg.

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Presentation transcript:

ENGS 112 Lecture 3 Packet Switching Chapter 3, Walrand WWW links, eg

OSI Reference Model Reference model...helps to discuss packet network functions. Many networks do not follow the protocol but it is useful to know for terminology and organizational purposes.

Layer 1: Physical Layer Unreliable communication of bits between two points. Link = transmitter, receiver, medium Synchronization header required to indicate transmission Unreliable....errors are not detected or corrected in this layer Characteristics – bps rates and bit error rates

Layer 2: Data Link Layer Supervises transmission of packets Adds sequence numbers and some form of error detection Requests retransmission at link level if appropriate This layer used for link level retransmission End-to-end error detection and retransmission done at Layer 4 (network) for networks with low BER. Characteristics Sublayer 2a: Media Access Control (MAC) - identify the destination hardware address in a shared medium Sublayer 2b: Logical Link Control - error detection and retransmission for shared media (Ethernet, wireless, etc)

Layer 3: Network Layer Routes packets between computers using link by link routing as specified in a routing table. Specifies packet formats, addressing schemes and routing protocols

Layer 4: Transport Layer Delivers messages between “ports” or Transport Service Access Points (TSAP’s) , web servers, file transfer are standard services with fixed, allocated ports. Need to know the port or check with a server to locate port Connection or connectionless (connect or not) Messages decomposed into packets, sequenced and given TTL Ping, traceroute

Layer 5: Session Layer Supervises dialogs between computers Layer 6: Presentation Layer Encryption, number conversion, etc Layer 7: Application Layer Network services used by user applications remote login, directory services

Ethernet (IEEE 802.3) Multiple Access Control in a broadcast medium CSMA/CD Implications and operational requirements LAN interconnections Spanning tree algorithm for bridges

OEE (Due Friday, April 14) Walrand page Walrand page