r rom
　　l relocatable
　　
　　Compression Types
　　
　　z zip compressed (note lower case)
　　x mzip compressed
　　w "STAC" compressed
　　
　　Extensions
　　
　　.tar A utility and file format used for packaging files together. These files are compressed using gzip or some other form of compression
　　.html The file is used with a Web browser application.
　　
　　
　　
　　
　　Software Naming Conventions for IOS - Features
　　
　　
　　ALL 0-9 a b c d e f g h i j k l m n o p q r s t u v w x y z ALL
　　
　　
　　a
　　a APPN
　　a2 ATM
　　a3 APPN replacement
　　
　　
　　b
　　b Appletalk
　　boot boot image
　　
　　
　　c
　　c Comm-server/Remote Access Server (RAS) subset (SNMP, IP, Bridging,IPX, Atalk, Decnet, FR, HDLC, PPP, X,25, ARAP, tn3270, PT,
　　XRemote, LAT) (non-CiscoPro)
　　c CommServer lite (CiscoPro)
　　c2 Comm-server/Remote Access Server (RAS) subset (SNMP, IP, Bridging,IPX, Atalk, Decnet, FR, HDLC, PPP, X,25, ARAP, tn3270, PT,
　　XRemote, LAT) (CiscoPro)
　　c3 clustering
　　
　　
　　d
　　d Desktop subset (SNMP, IP, Bridging, WAN, Remote Node, Terminal
　　Services, IPX, Atalk, ARAP)
　　(11.2 - Decnet)
　　d2 reduced Desktop subset(SNMP, IP, IPX, ATALK, ARAP)
　　diag IOS based diagnostic images
　　
　　
　　e
　　e IPeXchange (no longer used in 11.3 and later)
　　- StarPipes DB2 Access - Enables Cisco IOS to act as a "Gateway" to
　　all IBM DB2 products for downstream clients/servers in 11.3T
　　eboot ethernet boot image for mc3810 platform
　　
　　
　　f
　　f FRAD subset (SNMP, FR, PPP, SDLLC, STUN)
　　f2 modified FRAD subset, EIGRP, Pcbus, Lan Mgr removed, OSPF added
　　
　　
　　g
　　g ISDN subset (SNMP, IP, Bridging, ISDN, PPP, IPX, Atalk)
　　g2 gatekeeper proxy, voice and video
　　g3 ISDN subset for c800 (IP, ISDN, FR)
　　
　　
　　h
　　h For Malibu(2910), 8021D, switch functions, IP Host
　　hdiag Diagnostics image for Malibu(2910)
　　
　　
　　i (used for image names of platforms c2500 and larger)
　　i IP subset (SNMP, IP, Bridging, WAN, Remote Node, Terminal Services)
　　i2 subset similar to IP subset for system controller image (3600)
　　i3 reduced IP subset with BGP/MIB, EGP/MIB, NHRP, DIRRESP removed.
　　i4 subset of IP (5200)
　　ipss7 IP subset with SS7 (2600)
　　
　　
　　j
　　j ent