C3725-adventerprisek9-mz.124-25d.bin 2021 (2027)

For anyone building a CCNP or CCIE home lab using GNS3 or actual 3700 series hardware, this specific IOS version is a workhorse.

# From privileged EXEC mode copy tftp flash: # Source: TFTP server IP with the .bin file # Destination: flash:c3725-adventerprisek9-mz.124-25d.bin c3725-adventerprisek9-mz.124-25d.bin

Do use 12.4(25d) on an internet-facing production network today – it contains unpatched vulnerabilities (no more security updates from Cisco). Use only in isolated lab or air-gapped legacy networks. For anyone building a CCNP or CCIE home

: Indicates the image runs in RAM ( m ) and is compressed ( z ). and MGCP support.

: Enhanced Voice capabilities, including SIP, H.323, and MGCP support.