By Cisco Networking Academy
The Cisco CCNA protection curriculum offers a finished review of up to date community defense, supporting Cisco Networking Academy scholars systematically organize for the most recent CCNA safety examination. whereas large on-line research assets can be found, many scholars and teachers have asked a reasonably cheap revealed source that may be used to check in locations the place net entry will not be to be had. This book is that source. Drawn at once from the web curriculum, it covers each ability and competency. This ebook permits you to learn offline, spotlight key issues, and take handwritten notes. Its textual content is extracted word-for-word from the web direction, and headings with certain web page correlations hyperlink to the net path for school room discussions and examination training. furthermore, a suite of icons directs you to the net Cisco Networking Academcy curriculum to take complete benefit of the pictures, labs, Packet Tracer actions, and dynamic Flash-based actions supplied there.
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Extra info for CCNA Security Course Booklet, Version 1.0
Or instead of using HTTP, use HTTPS. ■ Establish a dedicated management network. The management network should include only identified administration hosts and connections to a dedicated interface on the router. ■ Configure a packet filter to allow only the identified administration hosts and preferred protocols to access the router. For example, permit only SSH requests from the IP address of the administration host to initiate a connection to the routers in the network. These precautions are valuable, but they do not protect the network completely.
To protect assets such as routers and switches, follow these common guidelines for choosing strong passwords. These guidelines are designed to make passwords less easily discovered by intelligent guessing and cracking tools: ■ Use a password length of 10 or more characters. The longer, the better. qxp 7/13/09 1:09 PM Page 31 Chapter 2: Securing Network Devices ■ Make passwords complex. Include a mix of uppercase and lowercase letters, numbers, symbols, and spaces. ■ Avoid passwords based on repetition, dictionary words, letter or number sequences, usernames, relative or pet names, biographical information, such as birthdates, ID numbers, ancestor names, or other easily identifiable pieces of information..
If an unauthorized person were to gain administrative access to a router, that person could alter routing parameters, disable routing functions, or discover and gain access to other systems in the network. Several important tasks are involved in securing administrative access to an infrastructure device: ■ Restrict device accessibility - Limit the accessible ports, restrict the permitted communicators, and restrict the permitted methods of access. 0 ■ Log and account for all access - For auditing purposes, record anyone who accesses a device, including what occurs and when.