{"id":6944,"date":"2019-10-07T11:11:15","date_gmt":"2019-10-07T11:11:15","guid":{"rendered":"https:\/\/www.devopsschool.com\/blog\/?p=6944"},"modified":"2020-05-28T08:16:39","modified_gmt":"2020-05-28T08:16:39","slug":"networking-and-engineer-interview-questions-and-answer-part-3","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/networking-and-engineer-interview-questions-and-answer-part-3\/","title":{"rendered":"Networking and Engineer Interview Questions and Answer &#8211; Part 3"},"content":{"rendered":"\n<ul class=\"wp-block-list\"><li>What is localhost and why would&nbsp;<code>ping localhost<\/code>&nbsp;fail?<\/li><li>What is the similarity between &#8220;ping&#8221; &amp; &#8220;traceroute&#8221; ? How is traceroute able to find the hops.<\/li><li>What is the command used to show all open ports and\/or socket connections on a machine?<\/li><li>Is 300.168.0.123 a valid IPv4 address?<\/li><li>Which IP ranges\/subnets are &#8220;private&#8221; or &#8220;non-routable&#8221; (RFC 1918)?<\/li><li>What is a VLAN?<\/li><li>What is ARP and what is it used for?<\/li><li>What is the difference between TCP and UDP?<\/li><li>What is the purpose of a default gateway?<\/li><li>What is command used to show the routing table on a Linux box?<\/li><li>A TCP connection on a network can be uniquely defined by 4 things. What are those things?<\/li><li>When a client running a web browser connects to a web server, what is the source port and what is the destination port of the connection?<\/li><li>How do you add an IPv6 address to a specific interface?<\/li><li>You have added an IPv4 and IPv6 address to interface eth0. A ping to the v4 address is working but a ping to the v6 address gives you the response&nbsp;<code>sendmsg: operation not permitted<\/code>. What could be wrong?<\/li><li>What is SNAT and when should it be used?<\/li><li>Explain how could you ssh login into a Linux system that DROPs all new incoming packets using a SSH tunnel.<\/li><li>How do you stop a DDoS attack?<\/li><li>How can you see content of an ip packet?<\/li><li>What is IPoAC (RFC 1149)?<\/li><li>What will happen when you bind port 0?<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>What is localhost and why would&nbsp;ping localhost&nbsp;fail? What is the similarity between &#8220;ping&#8221; &amp; &#8220;traceroute&#8221; ? How is traceroute able to find the hops. What is the command used to&#8230; <\/p>\n","protected":false},"author":1,"featured_media":7807,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[541],"tags":[],"class_list":["post-6944","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\/6944","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=6944"}],"version-history":[{"count":1,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/6944\/revisions"}],"predecessor-version":[{"id":6945,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/6944\/revisions\/6945"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media\/7807"}],"wp:attachment":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media?parent=6944"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/categories?post=6944"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/tags?post=6944"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}