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Pertemuan 03Routing

Matakuliah : H0451/Praktikum Jaringan Komputer

Tahun : 2006

Versi : 1/0

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Learning Outcomes

Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu :

• Menjelaskan mengenai Routing

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Outline Materi

• Layanan• Addressing

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TCP/IP Concepts

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IP datagram

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• Connection oriented– Virtual circuit defined for data trasfer

• Connectionless– Each PDU data transfer (datagram) treated

independently

Connection Control

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Addressing

• Addressing level• Addressing scope• Connection identifiers• Addressing mode

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Addressing Level

Level in communications architecture at which entity is named

• Unique physical address for each end system (workstation, server), each intermediate system (router), usually is referred as MAC address or Hardware address

• Network-level address (logical address)– IP address or internet address– Used to route PDU through network

• At destination data must routed to some process– Each process assigned an identifier– TCP/IP: port, OSI: Service access point (SAP)

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Addressing Scope

• Global– Global nonambiguity, Identifies unique system– Enables internet to route data between any two

systems • Need unique address for each device interface on

network– MAC address on IEEE 802 network Enables network to

route data units through network and deliver to intended system

• Addressing scope only relevant for network-level addresses

• Port or SAP above network level is unique within system, need not be globally unique (e.g port 80 web server listening port in TCP/IP)

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IPv4 Address Formats

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Addresses with subnetting

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Subnets and Subnet Masks

• Allow arbitrary complexity of internetworked LANs within organization

• Insulate overall internet from growth of network numbers and routing complexity

• Site looks to rest of internet like single network• Each LAN assigned subnet number• Host portion of address partitioned into subnet

number and host number• Local routers route within subnetted network• Subnet mask indicates which bits are subnet

number and which are host number

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Equipment

• Routers:– At Network layer– Can connect dissimilar LANs on the same

protocol– Some routers have support for may protocols

and protocol conversion– Can build large complex networks with

complex traffic routing– Limits the flow of broadcasts– Load sharing and balancing can be done– Complex features as Network Address

Translation (NAT), authentication, firewalling, etc. possible