To enable SSH on a router, which IOS image should be installed?

To enable SSH on a router, which IOS image should be installed?

• A. Image with the Advanced IP Service package
• B. NPE image
• C. K9 image
• D. Image with the Advanced Enterprise Services package

Answer: (C)

SSH needs cryptographic features built into the IOS image. The K9 image is the one that includes the cryptographic package required for secure protocols like SSH, so it’s the proper choice to enable SSH on a router. The other image families focus on different feature sets and don’t guarantee the crypto support SSH relies on, so they won’t enable SSH by themselves. Once you have the K9 image, you can proceed with configuring SSH (generating keys, setting domain name, and enabling SSH on the vty lines).

SSH needs cryptographic features built into the IOS image. The K9 image is the one that includes the cryptographic package required for secure protocols like SSH, so it’s the proper choice to enable SSH on a router. The other image families focus on different feature sets and don’t guarantee the crypto support SSH relies on, so they won’t enable SSH by themselves. Once you have the K9 image, you can proceed with configuring SSH (generating keys, setting domain name, and enabling SSH on the vty lines).