By Anthony Sequeira
With this record as your advisor, you are going to overview subject matters on imposing Cisco IOS community safety. This fact-filled quickly Reference enables you to get all-important info at a look, assisting you to concentration your research on components of weak spot and to augment reminiscence retention of crucial examination recommendations.
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STEP 2. If there are any existing key pairs, overwrite them using the command crypto key zeroize rsa. STEP 3. Generate keys to be used with SSH by generating RSA keys using the crypto key generate rsa generalkeys modulus modulus-size command in global configuration mode. STEP 4. Configure how long the router waits for the SSH client to respond using the ip ssh timeout seconds command in global configuration mode; this step is optional. STEP 5. Configure the number of SSH retries using the ip ssh authentication-retries integer command in global configuration mode; this step is optional.
SHA-1 The SHA-1 algorithm takes a message of no less than 264 bits in length and produces a 160-bit message digest. The algorithm is slightly slower than MD5, but the larger message digest makes it more secure against brute-force collision and inversion attacks. There are also 224-, 256-, 384-, and 512-bit versions of SHA. Best practices include the following: ■ Avoid MD5 if possible. ■ Consider using MD5 only if speed is an issue. ■ Protect HMAC secret keys. © 2012 Pearson Education, Inc. All rights reserved.
To communicate with the external Cisco Secure ACS, the Cisco device uses TACACS+ or RADIUS. Of the two, TACACS+ is more secure, but RADIUS is an open standard. Also, many of the most modern security features require the use of the open-standard RADIUS protocol. TACACS+ offers the following features: ■ Separates authentication and authorization ■ Supports a large number of features ■ Encrypts all communications ■ Uses TCP port 49 RADIUS offers the following features: ■ Scales well ■ Uses UDP ports 1645 or 1812 for authentication and UDP ports 1646 or 1813 for accounting © 2012 Pearson Education, Inc.