信息通信网络概论课件：Chapter2-作业

A PROBLEMS -- 3
An internet __Ethernet and Ethernet
PC
Router Interface A
Router Interface B
ROUTER
NOTEBOOK
SERVER
Question : If the server replies a packet sent by the PC , fill table 4 of the addresses in the packets sent by the server and received by the PC.
A example of an internet __Ethernet and Ethernet
Router Interface A PC
Router Interface B ROUTER
Βιβλιοθήκη Baidu
NOTEBOOK
SERVER
Question A: If the PC knows the notebook’s MAC address and the interface A’s MAC address of the router. The PC wants to send an IP packet to the notebook. Please put the layer2 and layer3 address field, of the packets sent by the PC, into the table 2.
PROBLEMS -- 1
TCP/IP Encapsulation P92: 19
− Suppose an application layer entity wants to send an L-byte message to its peer process, using an existing TCP connection. The TCP segment consists of the message plus 20 bytes of header. The segment is encapsulated into an IP packet that has an additional 20 bytes of header. The IP packet in turn goes inside an Ethernet frame that has 18 bytes of header and trailer. What percentage of the transmitted bits in the physical layer corresponds to message information if L=100 bytes ? 500 bytes ? 1000 bytes ?
PROBLEMS -- 2
P92: 20 − Suppose that the TCP entity receives a 1.5 megabyte file from the application layer and that the IP layer is willing to carry blocks of maximum size 1500 bytes. Calculate the amount of overhead incurred from segmenting the file into packet-sized units.
Question B: If the notebook knows the PC’s MAC address and the interface A’s MAC address of the router. The notebook wants to send an IP packet to the server. Please put the layer2 and layer3 address field, of the packets sent by the notebook and router into the table 3.