black fiber??? ...without light??? ...

.."Is HDLC and PPP a technology utilised for providing leased line connections, or is it a packet switching technology or can it be used for both?
I know that they use a serial connection on the router ..."
CISCO....

https://community.cisco.com/t5/routing/ppp-hdlc-leased-line-and-packet-switching/td-p/2040994

COMMUNITY.CISCO.COM

PPP, HDLC leased line and packet switching

Hi all This is my first post so pls be gentle! I am doing home study for my ccent. I am a little confused about where PPP and HDLC fit into the types of WAN…

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  Elsa David it couldn't be more "secret" guys...that's my experience talking...