LECTURE 4-Direct Link Networks Part I
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Dept. of EEE CS 65 Computer Networks Prepared by Dr.S.Muralidharan 1 Direct Link Networks What are we looking at ? • Networks i n whi ch ther e is no routing inv olved. • Issues to be addressed • Encodi ng digi tal bits onto links (encoding), Delineat ing bits into compl ete messages(framing),Error detection, Link reliability, Media access control. • There are two possibilit ies • Point to Poi nt l inks • Multiple-access • Ethernet, Token Ring 2 A B The link between A and B is a direct link Intermediate Device. May be Bridge, Router or Gateway A B C Devices A and C have a direct link between them Direct Li nks - outline • Physical Layer • Li nk technologi es • Encoding • Link Layer • Framing • Error Detecti on • Reli able Transmi ssion (ARQ protocols) • Medium Access Control: • Exi sting protocols: Ethernet , Token Rings, Wireless 3 Link Technologies • A direct link is called a mul tipoint link is there ar e more than two devices sharing the link. • A direct link between two dev ices i s called a point t o point link if and only if they are the only two devices sharing the link. 4 B C D E A F G H I A B C D E F G H I Links between A and B, A and C, A and D, A and E and A and F are all Point to Point Links Link between A, G, H and I is a Multipoint Link
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