As a network guy we should know about the naming convention of the IOS file name, which is usually similar to this form:
xxxx-yyy-ww.aaa-bb.bin
1. The xxxx is the platform, For example,
c1005 – For 1005 platform
c1600 – For 1600 platform
c1700 – For 1700, 1720, and 1750 platforms
c2500 – For 25xx, 3xxx, 5100, and AO (11.2 and later only) platforms
c2600 – For 2600 platform
c2800 – For Catalyst 2800 platform
c2900 – For 2910 and 2950 platforms
c3620 – For 3620 platform
c3640 – For 3640 platform
c4000 – For 4000 platform (11.2 and later only)
c4500 – For 4500 and 4700 platforms
2. The yyy is the feature set. For example,
b For Apple talk support
boot For boot image
c For CommServer lite (CiscoPro)
drag For IOS based diagnostic image
g For ISDN subset (SNMP, IP, Bridging, ISDN, PPP, IPX, and AppleTalk)
i For IP sebset (SNMP, IP, Bridging, WAN, Remote Node, and Terminal Services)
n For IPX support
q For asynchronous support
t For Telco return (12.0)
y For reduced IP (SNMP, IP RIP/IGRP/EIGRP, Bridging, ISDN, and PPP) (c1003 or c1004)
z For managed modems
40 For 40 bit encryption
50 For 50 bit encryption
3. The ww is for the format (where the IOS file runs in the router)
f For flash
m For RAM
r For ROM
l For the image will be relocated at run time
The file might also be compressed. The following letters denote the compression type,
z For zip compression
x For mzip compression
w For “STAC” compression
aaa-bb represent the version of the IOS. It is usually read like this “Version aa.a(bb)”. The last part of the IOS file name might contain letters like T (new feature release identifier), S (individual release number), or XR (modular packages).
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