210113 c dr rahul banerjee sdet unit bits pilani

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Unformatted text preview: es and Layer- 2 switches divide the network into segments or micro- segments (apart from helping in Layer- 2 protocol translaPon, management, security etc.) •  In effect, we can say that –  Layer- 2 Switches / Bridges separate collision domains –  Layer- 2 Switches / Bridges can carry out protocol translaPons 21/01/13 (c) Dr. Rahul Banerjee, SDET Unit, BITS- Pilani, INDIA 38 Summary of Differences Between L- 2 Switches, Routers (L- 3) and L- 3 Switches •  Routers are Layer- 3 devices who handle Layer- 3 packet rouPng within and outside the local network / internetwork and therefore effecPvely separate broadcast domains which end at its different network interfaces each of which carries a separate Subnet- idenPfier / Subnet- address (apart from Layer- 3 protocol translaPon, monitoring, security and management) •  Thus, in effect, we can say that: –  Routers Separate broadcast domains (each of such broadcast domains which end at its different network interfaces each of which carries a separate Subnet- idenPfier / Subnet- address ) –  Routers can carry out interior rouPng and / or exterior rouPng, depending upon their locaPon in the network –  Routers can carry out protocol translaPons (in terms of protocol- specific packet formats as well as in terms of allowing appropriately formamed selecPve data specific to rouPng protocols they may support). 21/01/13 (c) Dr. Rahul Banerjee, SDET Unit, BITS- Pilani, INDIA 39 Summary of Differences Between L- 2 Switches, Routers (L- 3) and L- 3 Switches •  Layer- 3 switches are devices which can handle all funcPonaliPes of Layer- 2 Switches as well as fast (o]en based on header/tag/label switching) Layer- 3 packet rouPng within but not outside the local network / internetwork; and therefore, effecPvely separate broadcast domains which end at its different LAN interfaces each of which carries a separate Subnet- idenPfier / Subnet- address (apart...
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