I read in one of Job descritpion "Experience of working on circuit(T1/E1,T3/E3,Ethernet) troubleshooting would be preferred".
Could u please help me this circuit t1/e1,etc. Is it covered in ccnap or ccnp rs ?
Is it frame-relay or mpls or other ?
Could you please explain or suggest me the book/blog/doc/etc.
