{"id":6950,"date":"2019-10-07T11:13:40","date_gmt":"2019-10-07T11:13:40","guid":{"rendered":"https:\/\/www.devopsschool.com\/blog\/?p=6950"},"modified":"2020-05-28T08:15:00","modified_gmt":"2020-05-28T08:15:00","slug":"networking-and-engineer-interview-questions-and-answer-part-4","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/networking-and-engineer-interview-questions-and-answer-part-4\/","title":{"rendered":"Networking and Engineer Interview Questions and Answer – Part 4"},"content":{"rendered":"\n
  1. Using the OSI model, which layer has the responsibility of making sure that the packet gets where it is supposed to go?<\/li>
  2. What is the subnet mask, network address and broadcast address for the following address: 123.65.47.62\/22?<\/li>
  3. What command is used to show all open ports and\/or socket connections on a machine?<\/li>
  4. What is NAT? What is it used for?<\/li>
  5. Which IP ranges\/subnets are “private” or “non-routable” (RFC 1918)?<\/li>
  6. What is a packet filter and how does it work?<\/li>
  7. What is a proxy and how does it work?<\/li>
  8. What is ARP and what is it used for?<\/li>
  9. What is the difference between TCP and UDP?<\/li>
  10. What command is used to show the route table for a machine?<\/li>
  11. Explain asynchronous routing?<\/li>
  12. What is the purpose of a default gateway?<\/li>
  13. A TCP connection on a network can be uniquely defined by 4 things. What are those things?<\/li>
  14. When a client running a web browser connects to a web server, what is the source port of the connection?<\/li>
  15. What is the destination port of the connection?<\/li>
  16. What is SMTP?<\/li>
  17. What is an SMTP relay?<\/li>
  18. Give the basic scenario of how a mail message is delivered via SMTP<\/li>
  19. What function does DNS play on a network?<\/li>
  20. What is an A record?<\/li>
  21. What is an NS record?<\/li>
  22. What is an MX record?<\/li>
  23. What is a PTR record?<\/li>
  24. What is a DNS forwarder?<\/li>
  25. What command is used to lookup DNS records?<\/li>
  26. What is meant by “Reverse Lookup”?<\/li>
  27. What is LDAP and what is it used for?<\/li>
  28. What is a DN in LDAP?<\/li>
  29. What is SSH?<\/li>
  30. What is SSL?<\/li>
  31. What is IDS?<\/li>
  32. What is IPS?<\/li>
  33. What is the difference between IDS and IPS?<\/li>
  34. What is meant by the term “DOS Attack”?<\/li>
  35. What is RAID?<\/li>
  36. What is swap and what is it used for?<\/li>
  37. What command will show the available disk space on the Unix\/Linux system?<\/li>
  38. How do you determine the public and prive IP addresses, if applicable, of a Unix\/Linux system from the command line?<\/li>
  39. What Unix\/Linux command will alter a file’s ownership?<\/li>
  40. What Unix\/Linux command will alter a file’s permissions?<\/li>
  41. What Unix\/Linux command will show all processes running on a system?<\/li>
  42. What Unix\/Linux command will show the details of a file(permissions, size, timestamp)?<\/li>
  43. What Unix\/Linux command would you use to list all currently loaded kernel modules?<\/li>
  44. What command would you use to telnet to port 7777 on a machine with IP address 10.10.10.128?<\/li>
  45. What Unix\/Linux command(s) will show a system’s current resource allocations?<\/li>
  46. What is the Unix\/Linux command to remove a directory and its contents?<\/li>
  47. What is the name and location of the system log on a Unix or Linux system?<\/li>
  48. What would you do to recover a lost the root password to a Unix\/Linux system?<\/li>
  49. What is the difference between hardlink and symlink?<\/li>
  50. What happens when you remove the source to a symlink?<\/li>
  51. What are some of the security risks of symlinks?<\/li>
  52. Explain a hardlink<\/li>
  53. Where is a filename stored?<\/li>
  54. What happens when a hardlink is removed<\/li>
  55. how do you know when a file is removed<\/li>
  56. Write a locking function in bash<\/li>
  57. What is a pre-emptive kernel, what does that mean to you?<\/li>
  58. What is an atomic operation?<\/li>
  59. How does a switch get a mac address?<\/li>
  60. What type of packet to discover a router?<\/li>
  61. How does traceroute work?<\/li>
  62. A careless sysadmin executes the following command: chmod 444 chmod<\/code> – what do you do to fix this?<\/li><\/ol>\n","protected":false},"excerpt":{"rendered":"

    Using the OSI model, which layer has the responsibility of making sure that the packet gets where it is supposed to go? What is the subnet mask, network address and… <\/p>\n","protected":false},"author":1,"featured_media":7804,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[541],"tags":[],"class_list":["post-6950","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-networking"],"_links":{"self":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/6950","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/comments?post=6950"}],"version-history":[{"count":1,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/6950\/revisions"}],"predecessor-version":[{"id":6951,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/6950\/revisions\/6951"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media\/7804"}],"wp:attachment":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media?parent=6950"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/categories?post=6950"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/tags?post=6950"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}