CDW interview for Network Engineer for 27 lpa

1. Explain TCP handshake? What are the different headers in the TCP and what are different flags in the TCP connection?

2. what is STP? What is RSTP and explain the process via the packets that they negotiate so that they can bypass the first 2 steps and directly move to the forwarding state?

3. What is UDLD?

4.What is VSS and stacking? Explain in depth and their protocols , how they negotiate which is going to take master role and other member role?

5. what are the various reasons that IPSEC connectivity or tunnel is not forming and what are the ways you can troubleshoot the issue?

6. Explain the difference between the IKEv1 and IKEv2? Have you ever implemented the IKEv2 and number of messages in the IKEv2 works, please elaborate them?

7. what is Type-4 LSA and if I do the packet capture , what are the fields I am going to see in that packet capture, explain in depth

8. what is NAT-T and what are the port number for NAT-T? how it works please explain?

9.how will you disable a SSID on the Aruba controller?

10. how will you influence the path of a route when there is failure of the ISP link and what happens in your organization when the ISP link went down?

11. Suppose you configure the HSRP on two switches and while checking the status of the HSRP both are active, how is to possible and what is the reasons that both are in Active state?

12. What is vPC ? Have you ever worked on the nexus switches?

13. What is ACI?

14. how will configure Cisco 9500 switches in the stacking?

15. How will you upgrade the Palo alto firewall?

16.Suppose there are 3 routers in single BGP AS number , you need to configure the Route reflector so do you need to enable the next-hop-self and why do you need to enable it? Please explain it.