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Routers Comparison as per need:

DRAM/Flash Memory Required for Feature Support

Model	IPv6	SDM	Max IOS Ver.
Cisco 2500	16/16	Not Available	12.3
Cisco 2600	64/16	Not Available	12.3
Cisco 2600XM	128/32	128/32	12.4
Cisco 3620	64/16	Not Available	12.3
Cisco 3640	128/32	64/16	12.4

Summary of Router Interfaces

Model	Ethernet	Sync Serial (DB-60)	Async/Sync Serial Ports		NM Slots Available	Wan Slots Available
Cisco 2501	1- AUI 10mb	2	0		0	0
Cisco 2503	1- AUI 10mb	2	0		0	0
Cisco 2507/16	16 Port Hub10mb	2	0		0	0
Cisco 2514	2- AUI 10mb	2	0		0	0
Cisco 2520	1- AUI 10mb	2	2		0	0
Cisco 2610	1- RJ-45 10mb	0	0		1	2
Cisco 2611	2- RJ-45 10mb	0	0		1	2
Cisco 2612	1- RJ-45 10mb	0	0		1	2
Cisco 2610/20XM	1-RJ-45 100mb	0	0		1	2
Cisco 2611/21XM	2-RJ-45 100mb	0	0		1	2
Cisco 1720	1- RJ-45 100mb	0	0		1	2
Cisco 2620	1- RJ-45 100mb	0	0		1	2
Cisco 2621	2- RJ-45 100mb	0	0		1	2
Cisco 3620	0	0	0		2	0
Cisco 3640	0	0	0		4	0
AUI = attachment unit interface.