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Operation and maintenance posts are all similar.
At first, it was self-introduction. Maybe the self-introduction was more comprehensive. The interviewer said, "Yes, you have finished all the questions I want to ask." ~
Then comes the technical question. First, I asked me about the basic concept of ARP.
Answer: ARP (Address Resolution Protocol) is a protocol between the second and third layers. The main function is to send broadcast requests in the LAN through the known destination IP address. , Query the destination MAC, the ARP response message is a unicast message from the destination node to the source node. There are many types of ARP. For example, gratuitous ARP can query whether the IP address configuration conflicts in the LAN.
Then the third layer did not ask, what are the commonly used protocols over TCP and UDP?
Answer: There are DNS, RIP, DHCP, Raidus, etc. on UDP, and HTTP, BGP, Telnet, etc. on TCP. I also mentioned their port numbers respectively.
Then ask why DNS uses UDP instead of TCP.
Answer: I haven't understood this carefully, but I think it must be related to the characteristics of UDP and TCP. I said that TCP is connection-oriented. It consumes a lot of resources and must ensure reliable transmission. The speed is slow. UDP is here. The aspect is better than TCP.
He said, yes, it's mainly about the transmission speed, the signal is not very good...I didn't hear the others clearly, so I agreed.
Then ask me what's the browser I usually use~ Do you know that there is a developer option?
Answer: I know that it is entered through F12. You can view the source code of some web pages, which is helpful for web design.
He also talked about some functions, and he said it would be good to know about it.
Then ask me what are the HTTP status codes?
Answer: There are five types of 100, 200, 300, 400, 500. The commonly used 200 means the connection is successful, and 400 means some parameter errors or other errors in the request. There are specific 40x to indicate.
Regarding these questions, he then asked me to talk about the understanding of the operation and maintenance post, and I asked him some questions about the content of his daily work, which are similar to most operation and maintenance posts I know.