other than the listed model number on the outside of the router, I don't think there are any differences in physical appearance. The 1721 comes w/16MB of nonupgradable flash, the 1720 comes w/8MB. I've pasted the comparison below-Hope this helps.
Cisco 1721 and 1720 Product Comparison Feature Cisco 1721 Cisco 1720 Routing Performance(based on 64-byte packet) 12,000 packets per second 8,400 packets per second DRAM (default/maximum) 32 MB/96 MB 32 MB/48 MB Flash (default/maximum) 16 MB/16 MB (Nonupgradable) 8 MB/16 MB IEEE 802.1Q VLAN Routing Yes No Encryption Module LED Indicator Yes No Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=55109&t=54972 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
