AT&T Senior Network Engineer interview questions

Technical.. How BFD works ? How to achieve fail-over in BGP ? What is VPC ? how it works ? Difference between the VPC and ether channel ? Scenario based questions in BGP What is ACI ? What is EPG ? Describe one senario where you were in critical situation and how did you handle the situation. What was the impact and resolution. Question on TCP handshake process, Dhcp DORA, SSL handshake, OSI layers , VPN, ssl and ipsec. L2 and L3 diff, digita certificates, encryption, scenario based questions. How the Global Traffic Manager works? VTP versions and differences, BGP MH scenarios, STP scenarios and difference, Bunch of LAN Switching practical scenarios, OSPF vs EIGRP. BGP practical scenarios (MED, next-hop, iBGP vs eBGP) stuff and a lot more!