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Published byToby Griffith Modified over 9 years ago
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Network – internet – part2 Address at diff. layers Headers at diff. layers Equipment at diff. layers
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Internet Layers - revision The Layers:
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Comparison of Layers The TCP/IP layers compared to OSI layers
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Addresses at diff. layers Each layer have its own address
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Application Addresses Port numbers A number between 1-65536 (16 bit) (1-1023 reserved) E.G. Web = 80 MAIL = 25 FTP = 21
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Transport Addresses Protocol numbers A number between 1-255 (8 bit) E.G. TCP = 6 UDP = 17 ICMP = 1
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Network Addresses IP-addresses (version 4) A number between 1- 4billion (32 bit) Normally shown in dot-notation i.e. each byte shown in distinct number: 192.33.89.101 An IP-address consist of a network part and a host part e.g. the address 10.66.77.88 consist of the network part 10.0.0.0 and a host part 0.66.77.88 A submask are used to parted an IP-address into a network and a host part e.g. 255.0.0.0
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Link Addresses Many network are used so many types of address exist. Often a LAN is used Where LAN is used the Address is a MAC- address A MAC-address is 48 bits long and totally unique impress into the network card An example: 00-0D-56-3C-7C-B1
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Headers at diff. layers Application Headers Differentiate from application to application E.g. Web (HTTP) (ASCII): “GET /laerer.rhs.dk/peterl/index.htm HTTP/1.1” Network Management (SNMP) (An Header) 035690878648907543256…. (this is the encoding of an SNMP-header)
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Headers at diff. layers Transport Headers (UDP)
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Headers at diff. layers Transport Headers (TCP)
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Headers at diff. layers Network Headers (IP)
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Headers at diff. layers Link Headers (Ethernet - LAN)
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Equipment - overview Repeaters Hubs Bridges Switches (layer 2) Routers Switches (layer 3) Probes
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Equipment – Layer 1 Repeaters For Ethernet-cable only Take the signal and amplified it i.e. with a repeater it is possible to have the cable 370 m. instead of 185 m. Hubs Works like a repeater But in a star-topology Each PC/device have its own cable into the Hub Normally RJ-45 connector, with a speed up to 100Mbps
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Equipment – Layer 2 Bridges Divide the LAN into segments (i.e. different broadcast domain) Uses MAC addresses to decide to forward the frame or not. An equipment with 2 or a few ports. Switch (layer2) Works like a bridge But in a star-topology i.e. many ports Build in hardware, so the internal speed a high Possible to build up a virtual LAN i.e. some port are connected but not all.
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Equipment – Layer 3 Routers The real workers in the internet – find paths to IP- packets Uses IP addresses to decide a route. For decision are routing tables build up. Possible to use different kind of network (ATM,LAN,ADSL) Switch (layer3) Works like a router can have many ports Build in hardware and have therefore a high speed.
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Equipment – Layer 1-3 Probes Equipment to find error or performance problems Gives an analysis of the traffic in the network Also called traffic-analyser or protocol- analyser
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That’s all folks
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