Review Questions
1. What are the functions of the computer network?
Answer: Data communication, resource sharing, increasing reliability, and improving system processing capacity
2. What are the stages of computer network development? What are the hallmarks of each stage of development?
Answer: It is divided into three phases. The first phase of computer network development. Iconic event: ARPANET
. The second phase of computer network development. Iconic event: NSFNet
. The third phase of computer network development. Iconic event: browser. Mosaic
3. What is a network protocol? What is the difference between protocol and standard?
Answer: A protocol is a set of rules that control data communication, that is, the order of data transmission is
different: we can understand the network communication protocol as a "dialect", and the standard as "Mandarin"
4. The three elements of the protocol are what?
Answer: Syntax, semantics, synchronization
5. Explain the meaning of the IEEE 802.11n standard in one sentence.
Answer: It is a standard that is still widely used in the draft stage. Now, the Wi-Fi wireless network that supports the IEEE 802.11n standard is one of the most widely used technologies in the world, and its reliability, performance, ease of use and wide applicability have been highly trusted by users.
6. Common in the network environment What are your network equipment?
Answer: Switch routing equipment, network security equipment, wireless network equipment, etc.
7. Briefly describe the advantages and disadvantages of the star topology.
Answer: Advantages: easy to implement, easy to expand the network, easy to troubleshoot
Disadvantages: high central node pressure, high network cost
8. Convert the decimal number 190 to binary (requires calculation process)
Answer:
9. Convert the binary number (11001001) 2 into decimal and hexadecimal numbers.
Answer:
10. What are the advantages of binary?
Answer: Binary is easy to implement, binary arithmetic rules are simple, and logical operations are easy to implement with binary
Preliminary exercises
1. The OSI reference model is an open architecture that divides the network into seven layers. What is the order from bottom to top?
Answer: Physical layer, data link layer, network layer, transport layer, session layer, presentation layer, application layer, layering
2. The TCP/IP model is a five-layer structure. What is the order from bottom to top?
Answer: Physical layer, data link layer, network layer, transport layer, application layer
3. What are the rules that must be followed between the sender and receiver at the same layer?
Answer: Agreement