From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001 From: Sven Eisenhauer Date: Fri, 10 Nov 2023 15:11:48 +0100 Subject: add new repo --- Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/buttons.html | 109 ++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/content.html | 159 +++++++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/index.html | 29 ++++ Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/media.html | 21 +++ 4 files changed, 318 insertions(+) create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/buttons.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/content.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/index.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/media.html (limited to 'Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5') diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/buttons.html b/Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/buttons.html new file mode 100644 index 0000000..cc477b7 --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/buttons.html @@ -0,0 +1,109 @@ + + + + + + + + + + + +New Page 1 + + + + + + + + + + + + + + + + + + + + + + + +
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+ + \ No newline at end of file diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/content.html b/Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/content.html new file mode 100644 index 0000000..0c4a4c2 --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_5/content.html @@ -0,0 +1,159 @@ + + + + + + + + +Content + + + + + + + + + + + + + + + + + + + +
+ + 3.2 + PPP Authentication 
  + 3.2.5 + Challenge + Handshake Authentication Protocol (CHAP) 
+ + + + + + + +
+ + CHAP is used at the startup of a link and periodically verifies the + identity of the remote node using a three-way handshake. CHAP is + performed upon initial link establishment and is repeated during the + time the link is established.

+ + After the PPP link establishment phase is complete, the local router + sends a "challenge" message to the remote node. + The remote + node responds with a value calculated using a one-way hash function, + which is typically Message Digest 5 (MD5). This response is based on + the password and challenge message. + The local + router checks the response against its own calculation of the expected + hash value. If the values match, the authentication is acknowledged, + otherwise the connection is immediately terminated. +

+

+ + CHAP provides protection against playback attack through the use of a + variable challenge value that is unique and unpredictable. Since the + challenge is unique and random, the resulting hash value will also be + unique and random. The use of repeated challenges is intended to limit + the time of exposure to any single attack. The local router or a + third-party authentication server is in control of the frequency and + timing of the challenges.    

+ + + + + +
+ + +
+ + + + + +
+ + + + + +
  +

+ + + + Lab Activity

+ +

e-Lab Activity: + + ppp chap hostname hostname

+ +

In this activity, the student will demonstrate how to use + the + ppp chap hostname hostname + command to create a pool of dialup routers.

+ +

+
+     + + + + + + +
+ + + + + +
+ +
+ + + + + +
+ + + + + +
  +

+ + Web Links

+ + +

Understanding and Configuring PPP CHAP Authentication

+ + http://www.cisco.com/en/US/tech/tk713/
+ + tk507/technologies_tech_note09186a
+ + 00800b4131.shtml

+ + +
+
+

+       +    +

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