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Next, let’s talk about using Cisco HDLC rather than PPP for
the point-to-point links on the internetwork. PPP offers the
opportunity for CHAP authentication, which HDLC does not, and is a
more modern protocol with generally more configuration options. The
deciding factor for me, though, is that with Cisco HDLC, you can put
a CSU/DSU device in loopback, and if the connection between the
router port and the CSU/DSU is good, the line protocol will come up.
With PPP it will not. This is a good starting point to have when you
are trying to troubleshoot, particularly an initial line
installation. If, however, you choose to utilize any LAN extender
devices, you will have to use PPP. I will choose PPP for the
asynchronous links, as the improved security features of this
protocol make it the obvious choice for a potential security
loophole such as dial-up connections. |
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