快乐学习
一个网站喵查铺子（catpuzi.com）全搞定~
A、WAN is a public data network
B、WAN shall provide telecommunication-level services for users
C、The focus of WAN research is broadband core switching technology
D、The core technolo……继续阅读 »
A、Optical fiber transmission network is the foundation of broadband metropolitan area network
B、The integration of traditional telecommunication, cable TV and IP services has becom……继续阅读 »
A、Bottom layer of the OSI reference model
B、Establishing, managing and releasing physical connections between communicating hosts
C、Realizing transparent transmission of the bit st……继续阅读 »
A、Adjacent high layer is the network layer
B、Data link can be established after the physical connection is released
C、Adopting the method of error control and flow control to make ……继续阅读 »
A、Adjacent high layer is the transport lay
B、Selecting an appropriate transmission link for the packet through the communication subnetwork by routing selection algorithm
C、Realizi……继续阅读 »
A、Adjacent lower layer is the network layer
B、Adjacent high layer is the presentation layer
C、Providing reliable end-to-end connection and data transmission services for compute pr……继续阅读 »
A、7 layers from the application layer to the physical layer of the host shown by the dotted line of the OSI environment and the communication subnet
B、The physical transmission med……继续阅读 »
A、The data generated by the application process of source host is transmitted vertically and layer by layer from the application layer
B、The presentation layer only exchanges data ……继续阅读 »
A、Realizing distributed process-communication in network environment
B、TCP is a reliable, connection-oriented, byte-stream-oriented transport layer protocol
C、An unreliable, connec……继续阅读 »
A、The nth layer provides services for the n+1 th layer
B、The n+1 layer adds a header to the message received from the nth layer
C、The n-layer header is used to coordinate protocol ……继续阅读 »
A、Protocol presents network functions
B、Semantic is what to do
C、Grammar means how to do it
D、Time sequence indicates the order of process
喵查答案：Protocol presents network functions
……继续阅读 »
A、Network architecture is a collection of network hierarchy model and protocols at each layer
B、All computer networks should follow OSI architecture.
C、The network architecture is……继续阅读 »
A、Each layer is independent with each other
B、Easy to implement and standardize
C、Allowing for interlayer communication is a sign of flexibility of OSI reference model
D、Changes in……继续阅读 »
A、Term ‘Open’ in “OSI Reference Model” refers to being able to be used for any kind of operating system for computer
B、The OSI reference model defines the hierarchy of ……继续阅读 »
A、Each host in the network can have different levels
B、The same layer of different hosts has the same function
C、Adjacent layers in the same host communicate through the interface
……继续阅读 »
