Computer Network interview questions Summary

1. What network protocol does the Internet use? What is the main hierarchy of the protocol?
TCP/IP application layer/Transport Layer/Network Layer/data link layer/Physical Layer
2. What protocol does the physical address and IP address of the Internet use for conversion?
ARP (Address Resolution Protocol)
3. What are the two parts of IP address encoding?
An IP address consists of a network number and a host number. However, it is only after bitwise AND top-up with the "subnet mask" that the network bit and host bit are distinguished.

 

5. Q &:
1. What is the principle of IP phone?
IPv6
2. What is the process of establishing TCP/IP communication? What is the role of a port?
Three-way handshake to determine the applicationProgramUse this Protocol
What is the difference between No. 3.1 and No. 7 signaling? Which one is widely used in China before?

 

12. What is the layer-7 model of ISO? What layer does TCP/UDP belong? What are the advantages and disadvantages of TCP/UDP?
Application Layer
Presentation Layer
Session Layer
Transport Layer
Network Layer
Physical Link Layer
Physical Layer
TCP/UDP belongs to the transport layer
The TCP Service provides data stream transmission, reliability, effective traffic control, full duplex operations, and Multiplexing technologies.
Unlike TCP, UDP does not provide reliable IP protocol mechanisms, stream control, and error recovery functions. Because UDP is relatively simple, the UDP header contains a few bytes, which consumes less than the TCP load.
TCP: provides stable transmission services with traffic control. The disadvantage is that the packet header is large and the redundancy is poor.
UDP: it does not provide stable services, with a small packet header and low overhead.