CCNA Security 640-554 Quick Reference by Anthony Sequeira PDF

By Anthony Sequeira

With this record as your consultant, you are going to assessment themes on enforcing Cisco IOS community safety. This fact-filled quickly Reference permits you to get all-important info at a look, supporting you to concentration your learn on parts of weak point and to reinforce reminiscence retention of crucial examination ideas.

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Hashing can also be used in a feedback-like mode to encrypt data; TACACS+ uses MD5 to encrypt its session. MD5 MD5 is a one-way function that makes it easy to compute a hash from the given input data but makes it unfeasible to compute input data given only a hash. The input is a data block plus a feedback of previous blocks. The 512-bit blocks are divided into 16 32-bit sub-blocks. These blocks are then rearranged with simple operations in a main loop, which consists of four rounds. The output of the algorithm is a set of four 32-bit blocks, which concatenate to form a single 128-bit hash value.

Choose Configure > Router > > ACL > ACL Editor. IPv6 Access Lists IPv6 access lists have the same structure and operational framework as in IPv4. You can match on the extension headers. Implicit entries exist at the end of each IPv6 ACL to enable neighbor discovery. The syntax is ipv6 traffic-filter to assign to the interface and ipv6 access-list to create. © 2012 Pearson Education, Inc. All rights reserved. This publication is protected by copyright. Please see page 89 for more details. [ 48 ] Chapter 3: Cisco IOS Firewalls Cisco IOS Zone-Based Policy Firewall One of the most exciting developments for Cisco in the area of IOS Firewalls has been the new zone-based firewall.

This publication is protected by copyright. Please see page 89 for more details. [ 56 ] Chapter 4: Site-to-Site VPNs ■ RC5: A fast block cipher that has variable block size and variable key size ■ RC6: A block cipher designed by Rivest, Sidney, and Yin and is based on RC5 (meant to meet the design requirements of AES) Cryptographic Hashes This section details the most common cryptographic hashes in use today. Hash Message Authentication Codes (HMAC) Hashing is typically used for the following: ■ To provide proof of the integrity of data, such as that provided with file integrity checkers, digitally signed contracts, and Public Key Infrastructure (PKI) certificates ■ To provide proof of authenticity when it is used with a symmetric secret authentication key, such as IPsec or routing protocol authentication Cisco technologies use two HMAC functions: ■ Keyed MD5, based on the MD5 hashing algorithm ■ Keyed SHA-1, based on the SHA-1 hashing algorithm Cisco products use hashing for entity-authentication, data-integrity, and data-authenticity purposes: ■ IPsec gateways and clients use hashing algorithms to provide packet integrity and authenticity.

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