4399 it operations intern interview experience

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Operation and maintenance posts are all the same.

The first time I came up, I still introduced myself. Maybe my introduction was more comprehensive. The interviewer said, "Yes, you have finished all the questions I want to ask." I smiled and said, "You can choose the ones that you are more interested in.Learn more~

Then there are technical questions, first ask me the basic concept of ARP
Answer: ARP (Address Resolution Protocol) is a protocol between the second and third layers. The main function is to pass the IP address of the known destination.Send a broadcast request in the local area network, query the destination MAC, and 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 check whether the IP addresses in the LAN are conflicting.

Then three layers did not ask, what are the commonly used protocols above TCP and UDP.
A: There are DNS, RIP, DHCP, Raidus, etc. on UDP, HTTP, BGP, Telnet, etc. on TCP. I also mentioned their port numbers.

Then ask DNS why it uses UDP instead of TCP.
Answer: I have not 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 it needs to ensure reliable transmission, and the speed is also slow.UDP is better than TCP in these aspects.
He said, yes, the main problem is the transmission speed, the signal is not very good... The latter did not hear much, so he agreed.

Then ask me what is my commonly used browser~ There is a developer option in it, you know?
A: I know that you can enter through F12, you can see the source code of some web pages, which is helpful for the design of web pages.
He talked about some functions, and he said it would be good to know about them.

Then ask me what are the HTTP status codes?
Answer: There are five categories: 100, 200, 300, 400, and 500. Commonly used is 200, which means the connection is successful, and 400, which means that some parameters of the request are wrong or other errors. There are specific 40x to indicate.

On these questions, he then asked me to talk about the understanding of the operation and maintenance position. I asked him some questions about the content of daily work, which were similar to most of the operation and maintenance positions I knew.