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https://community.cisco.com/t5/routing/does-hdlc-provide-a-form-of-authentication/td-p/1819486
Dec 16, 2011 · Hi.I've read that It provides no authentication.I know one of the reasons ppp Is used over HDLC Is because HDLC doesn't provide authentication. I took one of the ICND1 module tests on this site and one of the answers concerning HDLC states that It dows provide a form of authentication…
http://www.rfwireless-world.com/Terminology/HDLC-vs-PPP.html
It does not support authentication i.e. it fails to provide authentication between two nodes. It supports authentication using protocols such as PAP and CHAP : It provides a frame format which contains a proprietary field. The other 6 fields are similar to PPP protocol frame fields. ISO HDLC do not have proprietary field and hence has only 6 ...
https://learningnetwork.cisco.com/thread/98215
Jul 18, 2016 · Can HDLC operate with Authentication ? HDLC so far has two variants - cHDLC - Seems cisco variant. And, HDLC - ISO. The default encap on serials on Cisco is cHDLC. Below output is the center of discussion: R1(config-if)#encapsulation ? atm-dxi ATM-DXI encapsulation. frame-relay Frame Relay networks. hdlc Serial HDLC synchronous
https://ciscoskills.net/2012/02/21/hdlc-vs-ppp/
PPP offers many features that HDLC does not including the following: Authentication through the Password Authentication Protocol (PAP) and the Challenge-Handshake Authentication Protocol (CHAP) Compression capabilities with Stacker or Predictor; PPP Multilink, the ability to bundle physical channels into a single logical channel.
https://specialties.bayt.com/en/specialties/q/3140/what-is-the-difference-between-hdlc-amp-ppp/
ppp point to point is used in frame relay tech. HDLC is a cisco made protocol used in leased line (WAN connection)i.e in local loop. Differences between HDLC and PPP are (1) HDLC is cisco proprietary while PPP is an open standard. (2) HDLC does not provide authentication while PPP provides authentication like PAP and CHAP.
https://learningnetwork.cisco.com/thread/35196
Sep 27, 2011 · Anthony, Thanks for your speedy reply. Your link and summary paragraph from the course is a great help, I am trying not to get too bogged down in the details but sometimes it is not obvious what you have to be hot on and what you can just know the high level summary.
https://www.cisco.com/c/en/us/td/docs/routers/access/800M/software/800MSCG/serconf.html
Note Enabling or disabling PPP authentication does not effect the local router’s willingness to authenticate itself to the remote device. ... If you are not using the serial interface to support Cisco HDLC and PPP encapsulated connections, then you must configure subinterfaces with permanent virtual circuits (PVCs) under the serial main ...
https://www.cisco.com/c/en/us/td/docs/routers/access/800/819/software/configuration/Guide/819_SCG/6ser_conf.html
Mar 14, 2016 · Note Enabling or disabling PPP authentication does not effect the local router’s willingness to authenticate itself to the remote device. ... If you are not using the serial interface to support Cisco HDLC and PPP encapsulated connections, then you must configure subinterfaces with permanent virtual circuits (PVCs) under the serial main ...
https://www.answers.com/Q/What_is_the_difference_between_PPP_and_HDLC
Sep 18, 2012 · Differences between HDLC and PPP are (1) HDLC is cisco proprietary while PPP is an open standard. (2) HDLC does not provide authentication while PPP provides authentication like …
https://community.cisco.com/t5/other-network-architecture/choosing-frame-relay-hdlc-or-ppp/td-p/291662
That's right, HDLC will not support authentication as each vendor's implementation of the protocol is different - Cisco's implementation adds an extra field in the frame that allows it to support different L3 thats encapsulated in it. Normal HDLC does not have it (also the reason for the interoperability issue).
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