Zone of asking questions

Since many of us are students, we would like to ask questions on matters of Cisco so please feel free to ask and answer questions from anyone here. I'll start with my first two questions;

1. List 3 WAN physical layer standards.

2. List 3 WAN data link layer protocols.

I can't get my answers to the questions from my notes so please help me if possible. I appreciate it!

hi , i m Basudev

the WAN datalink layer protocol is
PPP, HDLC , FRAME RELAY , ATM , x.25 ...... ect //

u also find details in CCNA book ...

bye

Thanks a lot, buddy. I owe you one. I copy your answers and see if they're the best. When I can, I'll ask more questions on the network and the same goes for you guys!