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FREDWESTON.NET - Interview questions
Interview questions
Posted under Miscellaneous on Monday, November 25, 2013 @ 11:23:12 PM
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For some reason I was thinking about good interview questions.  I don't ever anticipate having the opportunity to hire someone these questions would apply to, but I wanted to write them down so I could use a few of them to gauge any applicant's level of network/systems awareness.
  1. How many timeslots on a T1?
  2. Explain the differences between T1 and PRI and explain why one is preferable to the other in various situations.
  3. What are the different types of ISDN?
  4. Name three types of digital subscriber line and give a unique characteristic of each.
  5. Explain 568a/b.
  6. What is an autonomous system?
  7. What is the difference between link-state and distance-vector routing protocols?  Give an example of each.
  8. What is the difference between iBGP and eBGP?
  9. Explain CIDR / VLSM.
  10. Explain the primary features of a hypervisor.
  11. Describe DNS resolution and how it relates to domain name registration.
  12. Describe in detail the process a Windows PC uses for name resolution.
  13. What protocols and ports do the following services use: http, https, smtp, dns, ftp, rdp, smb, kerberos?
  14. Explain the difference between stateful/stateless firewalls.
  15. Explain NAT and how it is different from PAT.
  16. From the CLI, how can you determine the serial number of a cisco router or switch?
  17. Explain what VLANs are, what they do and why you would want to use them.
  18. What is SPAN and why would you use it?
  19. Explain OSI layers 1-4 and give examples of devices and/or services that operate at each layer.
  20. What is the function of a layer 3 switch?  What benefit is there to doing L3 routing in a switch vs a router?
  21. Give a brief overview of 802.11 including the various specifications and frequencies used.  Define SSID.
  22. What is CAPWAP?
  23. What is RADIUS?  What is the name of the Microsoft implementation?  What are some examples of other implementations?
  24. What is a SAN and why would you want to use one?  What are some types of SANs?  What is a LUN?
  25. With regard to SANs, explain zoning.
  26. What are some KPIs that you would use when troubleshooting a storage slowdown?
  27. Describe the various packets that would be sent/received by a client leasing an IP address from a DHCP server.  What is the source and destination IP and MAC address of each packet?
  28. Briefly describe public key encryption.
  29. A Windows 2003 VM is running low on space on the system drive.  Describe the steps you would take to expand the system drive.
  30. In relation to networking, what is VTP and what is it used for?
  31. What is the process for opening a TAC case?
  32. Explain what a CDN is and how it works.
  33. Explain what a load balancer is and how it works.  Explain session stickiness / session affinity.
  34. Explain the concept of AWS regions and availability zones.
  35. What are the core storage services in AWS and in what case(s) is each appropriate?
  36. What services does a VMkernel port provide?
  37. What are the prerequisites for VMotion?
  38. What is SMS / SCCM and what can they be used for?
  39. Describe the method used to determine what group policies are applied to a given object in active directory.
  40. Describe the differences between vertical and horizontal scaling and talk about key architectural decisions that might need to be made when designing an app to enable horizontal scaling.
  41. What is static NAT?
  42. What is the maximum length of an Ethernet cable according to the spec?
  43. What are near end crosstalk and far end crosstalk?
  44. Which pins are used to transmit data on an ethernet cable and which are used for power?
  45. What is the maximum power draw for 802.3af PoE and PoE+?
  46. What is the spec bandwidth of USB 1.1, 2.0, 3.0, the various firewires, eSATA and Thunderbolt?
  47. Describe the difference between SCSI buses such as SAS and SATA and non-SCSI buses such as IDE.
  48. What is the difference between PCI-E and PCI-X?
  49. When referring to CD-ROM speed, what does 1X represent?
  50. What is the maximum upload speed of a 56k modem?
  51. Describe ARP/RARP.
  52. What is the CIDR notation for a subnet having 512 addresses?
  53. What is NetBIOS?
  54. TCP/IP is the most common networking protocol in use today.  What are the two other networking protocols that were natively supported in Windows 95?
  55. What functions does a BIOS provide?